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EK-DEFCN-IN-002

May 1990

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Document:	DECconcentrator 500 Installation
Order Number:	EK-DEFCN-IN
Revision:	002
Pages:	118
Original Filename:

OCR Text

~./

NOTICE - Class A Computing Device:
This equipment generates, uses, and may emit radio frequency energy. The equipment has

been type tested and found to comply with the limits for a Class A computing device

pursuant to Subpart J of Part 15 of FCC Rules, which are designed to provide reasonable
protection against such radio frequency interference when operated in a commercial
environment. Operation of this equipment in a residential area may cause interference; in
which case, measures taken to correct the interference are at the user’s expense.

CAUTION
The people who install the cabling system described in this guide should be familiar with
local building codes, fire codes, and any other applicable codes or regulations. The

manufacturers or their distributors and agents will not be responsible for damage due to
improperly installed cabling, neglect, misuse, or improper connection of devices to the
cabling system.

‘

DECconcentrator” 500

Installation

September 1990

o
I

of the
This manual describes how to install and check the operation
or concentrator. Configuration examples
500 wiring
DECconcentrat
and a description of the DECconcentrator 500 controis are
included.

Supersession/Update Information:

lilgliltiallo

This is a revised

EK-DEFCN-IN-002

September 1990

“The information in this documentis sub
change
jec
withoutto
notice and should notbe construed as

a commitment by Digital Equipment Corporation. Digital Equipment
Corporation assumes no
responsibility for any errors that may appear in this document.
Wi

Printed in U.S.A.

The following are trademarks of Digital Equipment Corporation:
BASIC

DECnet

DEC

DECbridge
DECall
DECconcentrator
DECconnect
DECdirect

DECserver
DECservice
DECsite
DECUS
DELNI

DECelms

DELUA

DEC FDDicontroller

DEQNA

DECNA

DEMPR

DECndu

MASSBUS
METROWAVE

DECrepeater

DESTA

SERVICenter
ThinWire
TURBOchannel
UNIBUS
VAX
VAXcluster
VA Xstation

VMS

d]iglilt]a]1
sl

This manual was produced by Telecommunications and Networks Publicatio

ns.

Contents

Safety

Preface

Introduction

1.1

Product OVerview . .........ccciiiieetnnnnnenonansasnnsns

1-1

=
—
L

1.1.2
1.1.3
1.2

Location ...........c.iiiiiiitiiiiiiieiereanniinaaeeans
Topologies . ....... ..ottt
iiiaananns
Physical Description . ..........cooiiiiiiiirneninenennennnn.

1-2
1-2
1-4

1.2.1

Card Cage .......cciiiiiiiiiiiiiiiennennnennnse

1-5

1.2.2
1.2.2.1
1.2.2.2

Controller/Backplane ..............ccoiiiiiiieenernnenn.
1570 (P
DataPath.............
. ittt

1-6
1-7
1-7

1.2.3.1
1.2.3.2
124
1.24.1

Diagnosticsand LEDs .............
... ...
o il
DataPath ....................... e
Network Management Board (DEFCN-MA) ................
Front Panel . ....P

1-8
1-8
1-8
1-8

1243
1244
1.2.5
1.2.6
1.2.7

DataPath ............iiiiiriiiiiieiieineeennn.
Data Link Layer Hardware . ...........................
Power Supply . ..... ..ot
Controls and Indicators . .. .................. e
Operational Software ........................... PR

1-9
1-9
1-9
1-10
1-12

1.1.1

—
-

123

1.2.4.2

e
o
=
|
=

3
-

Port Configurations

............cceiiiiuiinnrennnnennns

Port Board (DEFCN-NA,DEFCN-LA) ....................

Physical Layer Hardware .................

.. ...
.t

1-2

1-7

1-9

Preparing for Installation
2.1

Unpacking and Checking the Contents .................. [P

2-1

2.2

221
2.2.2

2.2.2.1

2.2.2.2

Site Preparation

......
.....
.0
...
0t
...

2-5

..............................
Locating the DECconcentrator 500 .......................
Office Installation ........
......
...
....
, ..

2-5
2-6

Satellite Distribution Frame Installation . .. ... ... R

2-7

Site Preparation Checklist

Rack Mount Installation ..............................

2223
2.2.3

224

2.2.5

ConfigurationRules ........
... ....
... ... ....
... ...
Available Fiber OpticCables ............................
Reconfiguring and Installing Additional Cables .............

2-7

2-7
2-7

2-8
2-8

Installation
3.1
3.2

33
34
34.1
3.4.2

3423
344

Introduction

........ ... ... .. .
Identifying OptionBoards .....................cc0ouuon.
...
Checking the Network Management Board Switch Settings . . . . ..

Installing the UnitintheRack .............................
Removing the PlasticCover .............................

Installing the Rack Mount Brackets .......................
PreparingtheRack ........
...
....
.. .........
....
.... .
Mounting the UnitintheRack ................ et

3-1

3-2

3-4
3-6

3-7
3-8

3-9

Checking the Wiring Concentrator
4.1
4.2
42.1

4.3
4.4

44.1

4.4.2

Introduction

. ...... ... ... .. . e
Running the Self-Test . ..............00iiineunnnnonn.
..

Connectingthe PowerCord .............................
Running the Loopback Teston EachPort ....................

4-1

4-2
4-2

Attaching FiberOpticCables .......................c0...
..

Identifying Fiber Optic Cable Connectors ..................
Connecting Fiber OpticCables ..........................

4-7

Problem Solving
5.1

Introduction

.......... ...

5-1

... .
.
Maintenance Strategy . ............ ...,

Problem-Solving Sequence

..................
... ...
...
...

Running the Self-Test ......
... ......
... v
...
..

Diagnosing Problems ........................
....
..

5.2

5.5
5.6

Loopback Testing ............. E

5.7

Down-Line Loading .................. R

5.7.1
5.7.2

R T R

Network Device Upgrade Utility .....................
...
.
DECelms and NCP Down-Line Loading ...................

5-2

5-8
5-9
Apenitic:

5-9

Configurations
A.l

Environments Served by FDDIPMD .. ..................
.. ..
UM

A22

A2l

o
b
o

WIring .......coviiiiniiiinennnn Ciesresseteatarensioans

A-1

Crossconnect . . ................ e

e eeeereieeee

A-1

A23
A3
A3l

Topology (Hierarchical Physical Star) .....................
Configuring the DECconcentrator 500 in FDDI Networks .......
Standalone Configurations ................coiiiiienn,

FDDI Wiring SubSystems . . . .......vveveeereeennneennn.

A-2
A-2
A-3

A3.2

DECconcentrator 500 Installed in Tree Configurations ........

A-S

A33

DECconcentrator 500 Installed in Ring Configurations .......

A-7

FDDI Redundant Topologies ...............cociiiien..

A-10

Option Board Installation

B.1

Option Board Installation ......... e e

B-1

B.2

RemovingCables ............cciiiiiiiiiennnninnenennenn.

B-2

—

B.2.1
B.2.2

Removing the Blank Handle or Installed Option Board .......
InstallinganOptionBoard ..................
... ...t

B-3
B4

Multimode Optical System
C.1

Overview

. .........cciiiiiiiininnnnnnnnnsheeesraarecens

C-1

C.2

Option Board Optical System . . ..........coiiiiiiiiiinnenn,

C-1

C.2.1

Optical Loss ..........ettt ..

—-

C.2.1.1

Optical Cable Attenuation ............ccveeivinneeonns

C-2

C21.2

Cable Repair Strategy ..........coiviiiiiiiininneennnn.

C22

Checking forOptical Loss .............ciiiiiiiiennnn.

Specifications

D.1

ittt

D-1

D.1.1

Fiber Optic Connector and Cable Specifications .............

D-2

D.1.2

Environmental Specifications . . ..............ccooveunn....

D-3

D.1.3

Electrical Specifications ..............
... itiiiiiin.

D.14

Power Supply Specifications ................ccveeirenn.. ~

|
|
—

Physical Specifications . ...............

Service Options
E.1
E.l1.1

Digital Service ..... et
v ectetecceenecaatracrarariveeeoas
On-Site Repair ............
.0t tiiiniinnnnnnennnnn

E-1
E-1

E.1.1.1

DECservice Customer Support . ............e

E-1

E.1.1.2

BASIC Customer Support

..... et

E-1

~—

E.1.1.3

On-Site ServiceCenter ..............ccciiiiiiinenn..

E-1

E.l.14

PerCall Service ...............ccciiiiiiinnnn.. ceeaes

E-2

E.1.1.5

DECall Service Program

............ i

E-2

—

E.1.2

.......... ittt iinneennannns

E-2

How to Get Service . ......... @tt ettt

E-2

E.2

Off-Site Service
-

DECconcentrator 500 Identification List

Related Documents

Glossary
Ao
s

Index

Figures
S

1-1
1-2

1-3
-4

1-5

2—-1
2-2

2-3

24
3-1

3-2

3-3
34

3-5

3-6
4-1
4-2

4-3
44

4-5

4-6
4-7

4-8
5-1

5-2
5-3

A Concentrator in a Simple Star Topology (Local Mode) ........
DECconcentrator 500 Installed in a Dual Counter-Rotating Ring . .
DECconcentrator 500 Installed in a Dual Ring of Trees . ........

Fully Configured DECconcentrator 500 . .....................

DECconcentrator 500 Controls and Indicators . . ...............

Checking the Shipping BoxContents . . ... ...................

U.S.A. and Intemational Power Cords .......................
DECconcentrator 500 Order and Serial Numbers .............

Sample Cable Plant Log Book Entry ........................
Sample OptionBoards ................. ...,
Checking the Network Management Board Switches ...........
Removing the PlasticCover ...............................

Preparing the Unit forMounting

...........................
Preparingthe Rack ........
... ... ... ....
o0,
.

ELLT

Installing the Unitinthe Rack .............................
Connectingthe PowerCord ...............................
Checking the Operational Status

. ..........................

Connecting a Loopback ConnectortoaPort ..................
Port LED Status During Loopback Testing ...................

Connector Types for FDDIDevices . .............ccouuuun....

Connecting Keyed FDDI Cables and 2.5 mm ST-type Cables . ...

Connecting a Concentrator in a Dual Ring of Trees

............

ELU T

LEDs: Fully Configured and Cabled DECconcentrator 500 .. .. ..

DECconcentrator SOOFRUs . ..................
... ...,
.

Normal LED Condition ..................................

A-1

Installing a Loopback Connector ......................e
Equipment Rooms

A-2

Standalone Workgroup Installation (No Network Management

Present) .. ... ..

A-3

Dedicated High-Performance Network Installation
(Network Management Present) . ...........................

fLe

Simple Tree TopologyonaDualRing .......................
Logical Star, Tree Topology, FDDI Campus Backbone ..........

DECconcentrator 500 Installed in High-Speed Dedicated Network
DECconcentrator 500 Installed in a Logical Ring with Workgroup
LANs Within a Building ....... e et
e
DECconcentrator 500 InstalledinaCampus ..................
DECconcentrator 500 Installed in Redundant Topologies ........
RemovingCables ..............0iiiiiiiiiiiiiiinnnnnnnnn
Removing a Blank Handle or Installed OptionBoard ...........
Installing OptionBoards
. . ........... ... ... i, ..

A-5
A-6
A-7

A-8
A-9
A-10
B-2
B-3
B4

Tables
Option Board Configurations .................
... ... ...,
DECconcentrator 500 Controls ..............
... oo,
DECconcentrator 500 LEDs ...............
.. .o i,
International Power Cords . ........ ...,
Maximum Cable Lengths ..................... et
Network Management Board Switch Setting ..................
ConnectionRules ...........
... i, e
Basic Problem Solving by Symptom ........................
Port Board Problem Solving ...............
...
i,
Network Management Board Problem Solving ................
Problem Solving During Loopback Testing ...................
Rack Mount Unit Physical Specifications ....................
Tabletop Unit Physical Specifications (Plastic Enclosure) .......
Cable Specifications . .........
... it iiiiiiiinennneens
Fiber Optic Connector Specifications .......................
Fiber Cable Specifications ...............
. ...,
Alternate Fiber Cable Specifications ........................
Operating Environment Specifications . . .....................
Shipping Environment . ................ciiitiiiiiiinaa.
Electrical Specifications ............
...
it

1-6
1-10
1-11
2-3
2-8
34
46
5-6
5-7
5-7
5-9
D-1

D-1

D-1
D-2
D-2

D-2
D-3
D-3
D4

vii

Safety

Any warnings and cautions that appear in this manual are defined as follows:

WARNING A Contains information to prevent personal injury.
TM

VORSICHT

Enthilt Informationen, die beachtet werden miissen,
um den Benutzer vor

Schaden zu bewahren.

DANGER

Signale les informations destinées a prévenir les accidents corporels.

AVISO

Contiene informacién para evitar dafios personales.

CAUTION A Contains information to prevent damage to equipment.
ACHTUNG

Enthilt Informationen, die beachtet werden miissen, um die Gerate vor Schaden
zu bewahren.

ATTENTION

Signale les informations destinées a prévenir la détérioration du matériel.

PRECAUCION

Contiene informacién para evitar dafios al equipo.

The warnings and cautions that must be observed for the hardware described in this document are
listed below in English, German, French, and Spanish. The pages on which these safety messages

appear are also listed.

Notes that are important to the system’s installation, operation, function, and service are in English
throughout this document.

WARNING A The DECconcentrator 500 contains no user-serviceable parts. During installa-

(page xv)

tion the unit should not be opened for any reason. If the concentrator is in need
of repair, only qualified personnel familiar with safety procedures for electrical
equipment and the DECconcentrator 500 should access components inside the

VORSICHT

Die DECconcentrator 500 enhilt keinerlei Teile, die der Benutzer warten
konnte. Wihrend der Installation sollte das Gerit auf keinen Fall geoffnet
werden. Reparaturen jeglicher Art an der DECconcentrator 500 diirfen nur von

elektrotechnisch qualifiziertem Wartungspersonal ausgefiihrt werden.

DANGER

Le DECconcentrator 500 ne comporte aucun élément remplagable par 1’ utilisateur. Cet appareil ne doit en aucun cas étre ouvert, y compris lors de 1’installation. Les opérations d’entretien et d e réparation doivent impérativement étre
effectuées par des techniciens qualifiés.

AVISO

El DECconcentrator 500 contiene componentes que no pueden ser manejados

por el usuario. Durante la instalacién, 1a unidad no debe abrirse bajo ningiin con-

cepto. Si el puente necesita una reparacién de alguno de los componentes internos de la unidad, sélo podré llevarla a cabo personal especializado y familiariza-

con los procedimientos de seguridad de los equipos eléctricos y del
DECconcentrator 500.

WARNING 2\ To remove power from the unit, disconnect the power cord. Do not apply

(page xv)

power to the unit unless all covers are installed.

VORSICHT

Wenn Sie die Stromzufuhr unterbrechen wollen, miissen Sie das Netzkabel aus
der Wandsteckdose ziehen. Sie diirfen das Gerit nicht an das Stromnetz anschlieBen, bevor nicht alle Abdeckungen wieder ordnungsgemii angebracht wordensind.

DANGER

AVISO

Débranchez le cordon d’alimentation pour isoler 1’équipement du réseau électrique. Ne reliez au secteur qu’apres 1’installati compléte de tous les capots.

Cortar el suministro eléctrico de 1a unidad, desconectar el cable de alimentacién.

La unidad no debe recibir suministro eléctrico a menos que estén instaladas

todas las cubiertas.

DECconcentrator 500 Installation

]

MM,

s
s

WARNING
|

(page xv)

three-wire plug cap of the ac power cord. For continued protection against risk

be connected to a three-wire wall receptacle
this product must
of electric shock,
that has its grounding terminal reliably connected to the building’s safety earth
ground.

VORSICHT

Das Stromkabel in diesem Gerit ist mit einem Schutzleiter versehen. Um optimale Sicherheit zu gewihrleisten, diirfen Sie es nur an eine ordnungsgemiB

geerdete Schuko-Steckdose anschlieen.

—

A safety earth ground wire has been incorporated into this product through the

DANGER

—

Cet équipement est mis 2 la terre au moyen du fil de terre ducordon d’alimenta-

tion secteur. Afin d’assurer une protection efficace contre tout risque d’électro-

cution, cet équipement doit étreraccordé a une prise secteur équipée d’un

contact de mise 2 la terre effectivement reli€ 2 la terre secteur du batiment.

AVISO

El producto consta de un cable de tierra en el enchufe trifdsico del cable de
alimentacién. Para evitar el riesgo continuado de descargas eléctricas, este
producto debe conectarse en una toma de pared trifisica que tenga un terminal de

tierra con una conexi6n fiable a la toma de tierra del edificio.

WARNING

For continued protection against risk of electric shock, this product must be con-

(page 2-3)

nected to a three-wire wall receptacle that has its grounding terminal reliably

VORSICHT

Um optimale Sicherheit zu gewihrleisten, diirfen Sie es nur an eine ordnungs

o
-

DANGER

Afin d’assurer une protection efficace contre tout risque d’électrocution,cet
équipement doit étreraccordé 2 une prise secteur équipée d’uncontact de

o
-

AVISO

—

connected to the building’s safety earth ground.

gemiB geerdete Schuko-Steckdose anschlieBen.

mise 2 la terre effectivement relié 2 la terre secteur du béatiment.

Para evitar el riesgo continuado de descargas eléctricas, este producto debe conectarse en una toma de pared trifisica que tenga un terminal de tierra con una

conexion fiable a la toma de tierra del edificio.

WARNING A To avoid bodily injury or damage to the equipment, do not connect the power
(page 3-1)

cord or any other cable until you are instructed to do so in these procedures.

Do not apply power to the unit unless all covers are installed.
VORSICHT

SchlieBen Sie das Netzkabel oder andere Kabel erst an, wenn Sie dazu
aufgefordert werden. Andemfalls besteht LEBENSGEFAHR! Uberdies
- konnen die Gerite Schaden nehmen.

SchlieBen Sie das Gerit erst an das Stromnetz an, wenn alle Abdeckungen ord
nungsgemail angebracht worden sind.
A

- DANGER

Afin d’éviter tout risque d’accident corporel ou matériel, NE BRANCHEZ AUCUN cordon d’alimentation ou autre céble sans en avoir regu I’instruction expli
cite dans la procédure.
Ne reliez au secteur qu’apres I’installation complete de tous les capots.

AVISO

Para evitar dafios intemos al equipo, NO conectar el cable de alimentacién ni
ningdn otro hasta que se indique en estos procedimientos.

WARNING

(page 4-2)

To avoid bodily injury, use care when connecting the concentrator power
cord. Regulations in some countries may require an authorized person to
connect the power.

Make sure you connect the power cord to a grounded wall outlet.

VORSICHT

Netzspannung ist lebensgefihrlich. Beachten Sie dies, wenn Sie das Netzkabel

anschlieen. In einigen Ldndem diirfen Elektrogerite nur von entsprechend
ausgebildetem Personal, beispielsweise Elektrikern, angeschlossen werden.
Priifen Sie, ob das in Ihrem Land zutrifft.

SchlieBen Sie das Netzkabel nur an eine geerdete Steckdose an.

DANGER

Afind’éviter tout risque d’accident corporel, agissez avec la plus grande précaution lors du raccordement du cordon d’alimentation du concentrateur. Assurez-

vous que la législation vous autorise bien 2 effectuer ce branchement.

Assurez-vous que la prise sur laquelle vous raccordez le cordon d’alimentation
est effectivement reliée 2 la terre.

AVISO

Para evitar dafios generales, es importante tener cuidado a la hora de conectar el

cable de alimentacién del concentrador. En algunos pafses existen estipulaciones para que la conexi6n la tenga que hacer una persona autorizada.

Hay que comprobar que se conecta el cable de alimentaci6én a una toma conec-

tada a tierra.

WARNING
(page 4-4)

Some fiber optic equipment can emit laser light that can injure your eyes. Never
look into an optical fiber or connector port. Always assume the cable is con-

nected to a light source.

xii

DECconcentrator 500 Installation
AN

VORSICHT

Schauen Sie niemals direkt in ein Glasfaserkabel oder einen Glasfaseranschlu8.

- Die Laserstrahlen in faser- optischen Geriten konnen Augenverletzungen verursachen.

DANGER

Certains équipements utilisant les fibres optiques peuvent émettre des rayonnement laser dangereux pour les yeux. Ne vous avisez jamais de regarder par
1’extrémité d’une fibre optique ou dans1’ouverture d’un connecteur. Considérez
toujours que le cdble est reli€é a une source lumineuse.

AVISO

Algunos equipos de fibra 6ptica pueden emitir luz 1aser que dafialos ojos. No se
debe mirar en una puerta de conector o fibra 6ptica. Siempre se debe suponer que
el cable esti conectado a la luz.

WARNING 2\ Digital recommends that only experienced service engineers should perform the
(page 5-2)

replacement procedures.

VORSICHT

Sollten Sie diese Arbeiten nur von qualifiziertemWartungspersonal
durchfiihren lassen.

DANGER

Digital conseille d’avoir recours aux services d’un technicien de maintenance
chevronné.

AVISO

Digital recomienda que sélo realice esta labor una persona con experiencia.

WARNING 2\ Always remove the power cord from the concentrator and ac source when
(page 5-2)

performing any removal and replacement procedures.

To avoid possible personal injury, let the unit cool for 5 minutes before
attempting to gain access to internal parts.

VORSICHT

Bevor Sie Teile entfernen oder ersetzen, miissen Sie immer zuerst das
Netzkabel aus der Wandsteckdose und anschlieBend aus der Netzbuchse am
Konzentrator ziehen.

Die Teile im Inneren des Geriits sind sehr hei.Lassen Sie das Gerit mindestens
5 Minuten abkiihlen, bevor Sie es 6ffnen, um Verbrennungen zu vermeiden.

DANGER

Assurez-vous toujours que le cordon d’ alimentation est débranché du concentrateur et du secteur lors des procédures de dépose et pose de composants.

Afin d’éviter tout risque d’accident, laissez 1’équipement refroidir pendant 5
minutes avant d’accéder aux composants internes.

AVISO

Desconectar siempre el cable de alimentacién del concentrador y de 1a toma de
corriente alterna al realizar cualquier procedimiento de sustitucion.
Para evitar posibles dafnos personales, el equipo deberia enfriarse durante cinco
minutos antes de tratar de acceder a su interior.

Xiii

CAUTION A\

(page 2-1, 3-1)

~ ACHTUNG

Static electricity can damage modules and electronic components. Digital

recommends you use a grounded wrist strap and grounded work surface (Digital
P/N 29-11762) when you handle any modules or internal parts.
Module und elektronische Komponenten kénnen durch elektrostatische
Entladungen beschidigt werden. Benutzen Sie immer eine antistatische

Gelenkmanschette und eine geerdete Arbeitsunterlage, wenn Sie am offenen
Gerit arbeiten. Ein Antistatik-Kit ist in der BRD bei DECdirekt unter der
Bestellnummer 29-26246 erhiiltlich.

ATTENTION

Les charges excessives d’électricité statique peuvent endommager les modules

et les composants électroniques. Digital conseille 1’utilisation d’un bracelet de

masse et d’un plan de travail mis 2 1a terre (Réf. 29-11762) lors de la manipula-

tion des modules et des composants internes.

PRECAUCION

CAUTION A\

(page 3-7)

La electricidad est4tica puede dafiar los componentes electrénicos y los médulos. Digital recomienda que se utilicen cintas de pasadores y superficiesde
trabajo conectadas atierra (Digital P/N 29-11762) al trabajar con cualquier
moédulo o parte interna.

Do not reinstall the cover screws into the wiring concentrator’s metal chassis.
Doing so could damage the wiring concentrator.

ACHTUNG
ben

Der Kabelkonzentrator kann beschidigt werden, wenn Sie die Gehiuseschrau-

ATTENTION

Ne remontez pas les vis du capots sur le chassis métallique du concentr

ateur de

cébles. Ceci pourrait endommager le concentrateur.

PRECAUCION

CAUTION

(page 4-7)
ACHTUNG

No hay que volver a instalar los tornillos de 1a cubierta en el chasis

de metal del
concentrador del cableado, porque al hacerlo se podria dafiar éste.

ers A3

inches) or greater.

Der Biegungsradius von faseroptischen Kabeln mu mindestens 7,5

cm betra-

Assurez-vous que le rayon de courbure des fibres optiques n’est jamais
Hay que comprobar que el radio de inclinacién de cualquier cable

fibra es de es de 7,5 centimetros (3 pulgadas) o mayor.

Xiv

a 75 mm.

PRECAUCION

Make sure that the bend radius of any fiber optic cable is 7.5 centimet

gen.

ATTENTION

am Metallgehiuse fiir den Kabel konzentrator befestigen.

inférieur

éptico de

DECconcentrator 500 Installation

Preface
This guide explains how to install the DECconcentrator 500 wiring concentrator and how

to check its installation and operational status. Also included is a description of the wiring
concentrator controls and indicators and some examples of the DECconcentrator 500 installed in a network.

Intended Audience

This guide is intended for the hardware installer and system/network manager who is familiar with fiber optic network technologies, the Fiber Distributed Data Interface (FDDI)
ANSI X3T9 standards, safety procedures, and has been trained to service this product.

WARNING A\
This unit contains no user-serviceable parts. During installation the unit should not be opened for any reason. If
the unit is in need of repair, only qualified personnel familiar with safety procedures for electrical equipment
and this unit should access components inside the unit.

WARNING
To remove power from the unit, disconnect the power
cord. Do not apply power to the unit unless all covers are
installed.

WARNING
A safety earth ground wire has been incorporated into

this product through the three-wire plug cap of the ac
power cord. For continued protection against risk of
electric shock, this product must be connected to a three-

wire wall receptacle that has its grounding terminal reliably connected to the building’s safety earth ground.

NOTE
This product automatically adjusts to 120 Vac or 240
Vac; therefore, a voltage select switch is not provided.

How to Use This Guide
Before you install the DECconcentrator 500, Digital Equipment Corporation recommends that you read Chapters 1 and 2. These chapters describe the unit and important

steps to take before you install it. If you experience a problem during the installation and
checking of the unit, refer to the problem-solving procedures in Chapter 5. The appendixes contain additional information that may be useful during installation of the unit.

vvvvv e

Document Structure
This document has five chapters and seven appendixes, as follows:

Chapter 1

Describes the DECconcentrator 500, option boards, and controls
and indicators.

Chapter 2

Describes the contents of the DECconcentrator 500 shipment and
important site preparation information that must be considered
before the installation.

Chapter 3

Describes the installation procedures for installing any additional
option boards, and installing the unit in a rack.

Chapter 4

Describes powering up the unit, connecting cables, and checking
the operational status of the wiring concentrator.

Chapter 5

Describes the steps to take to solve problems that may occur during installation and checking the operational status of the wiring
concentrator.

Appendix A

Describes several configurations of the wiring concentrator installed in a standalone configuration and in several network configurations.

Appendix B

Describes installation procedures for option boards
Aoy

Appendix C

Briefly describes the multimode fiber optic system.

Appendix D

Lists the concentrator’s operational, environmental, and electrical

specifications.

Appendix E

xvi

Describes service options that are available to you from Digital
Equipment Corporation.

DECconcentrator 500 Installation

Appendix F

Contains the DECconcentrator 500 Identification List to fill out
and give to the system/network manager.

Appendix G

Lists other documents that may be useful.

The postage-paid Reader’s Comments form on the last page of this document requests
the user’s critical evaluation to assist us in preparing future documentation.
Acronyms

The following acronyms appear in this manual:
ANSI

American National Standards Institute

AVS

Auto voltage select

CON

Concentrator

DAC

Dual attachment concentrator

DAS

Dual attachment station

DECelms

Digital Extended LAN Management Software

DLL

Data link layer

DRAM

Dynamic random access memory

EEPROM

Electrically erasable read-only memory

ELM

Elasticity buffer link mahagement encoder

FDDI

Fiber Distributed Data Interface

HDF

Horizontal distribution frame

IDF

Intermediate distribution frame

LAN

Local area network

LED

Light emitting diode

LLC

Logical link control

xvii

MAC

Media access control

MDF

Main distribution frame

MOP

Maintenance operations protocol

NCP

Network control program

ODF

Office distribution frame

PHY

Physical layer protocol (physical media independent)

P-type i-ntrinsic n-type (semiconductor)
B
Y

Physical layer ‘

PMD

Physical layer medium dependent

ROM

Read only memory

SAC

Single attachment concentrator

SAS

Single attachment station

SDF

Satellite distribution frame

SMT

Station management

X viii

DECconcentrator 500 Installation

”

Introduction

1.1

o
o

Product Overview

The DECconcentrator 500 intelligent wiring concentrator is an American National Stan-

dards Institute (ANSI) X3T9 compliant physical layer device for use in a Fiber Distrib-

uted Data Interface (FDDI) network.

Digital Equipment Corporation’s second generation local area networking technology is

FDDI. FDDI provides a high-bandwidth (100 megabits per second), gcncral-»purpose

connection between computers and peripheral equipment in a token passing, dual ring of

trees configuration. FDDI establishes the connection between many stations distributed

over long distances. Stations can be separated by as much as 2 kilometers (1.2 miles). An

FDDI network can have up to 1000 physwal connections and a total fiber path length of

200 kilometers (124 miles).

FDDI is defined by the four ANSI X3T9 standards and consists of:

A Physical Layer (PL) that is divided into two sublayers:
—

nector, and optical pulse requirements.

—

The Physical Layer Medium Independent (PHY) sublayer provides for cod-

ing, clock rate differences, and symbols. The PHY is the connection be-

The Physical Media Dependent (PMD) sublayer provides for the fiber, con-

tween the PMD and the Data Link Layer.

A Data Link Layer (DLL) that is divided into two sublayers:

—

A Media Access Control (MAC) that provides for access to the medium,

address recognition, and frame generation and checking.

—

A Logical Link Control (LLC) that provides a common protocol for

vices between the MAC and the Network Layer.

ser-

Filine

A Station Management (SMT) component that provides station initialization,

fault isolation and recovery, configuration, and scheduling services.

The DECconcentrator 500 can provide the attachment to a dual ring and additional at-

tachment points for stations that are not part of the dual ring.

1.1.1

Port Configurations

The concentrator is flexible, you can start with a minimum configuration of four ports for
FDDI station connections. A fully configured DECconcentrator 500 has 10 ports for

FDDI station connections. You can have up to 12 ports for single attachment stations

(SASs) in a standalone configuration. A dual attachment station (DAS) or concentrator
can be connected to a SAS port as a single attachment device.

1.1.2

Location
Wiy

You can install the DECconcentrator in a standalone configuration or in an extended local
area network (LAN). You can place and use the DECconcentrator 500 in a main distribu-

tion frame (MDF), intermediate distribution frame (IDF), horizontal distribution frame
(HDF), office distribution frame (ODF), satellite distribution frame (SDF), open office
environment, and computer room. A concentrator enclosed in plastic skins can be placed

ARty

on adesk in an open office; a concentrator without plastic skins can be installed in a stan-

dard 48-centimeter (19-inch) wide rack.

1.1.3

Topologies
The wiring concentrator provides the connection to FDDI stations in physical star or dual
ring topologies (Figure 1-1 and Figure 1-2). The DECconcentrator 500 can also be in-

stalled in a dual ring of trees configuration (Figure 1-3). See Appendix A for additional

configuration examples.

For maximum flexibility and manageability of the network structure, Digital recom-

mends a dual ring of trees topology with the dual ring contained within the main distribution frame of the cable plant.

ity

DECconcentrator 500 Installation

Figure 1-1: A Concentrator in a Simple Star Topology (Local Mode)

CON = DECconcentrator 500
SAS = Single Attachment Station
DAS = Dual Attachment Station used as an SAS
LKG-3791-001

Figure 1—-2: DECconcentrator 500 Installed in a Dual Counter-Rotating
Ring

Primary Ring

" Secondary Ring

oou H

CON = DECconcentrator 500
SAS = Single Attachment Station

* DAS = Dual Attachment Station used as an SAS
LKG-3792-901

Introduction

1-3

Figure 1-3: DECconcentrator 500 Installed in a Dual Ring of Trees

Primary Ring

CON = DECconcentrator 500
SAS = Single Attachment Station
|
DAS = Dual Attachment Station used as an SAS
LKG-3793-001

1.2 Physical Description

A fully configured DECconcentrator 500 consists of the cover, chassis, card cage, intelligent Controller/Backplane, two Port boards, one Network Management board (or
alternatively, three Port boards), power supply, and fan. Light emitting diodes (LEDs)
provide
board, power supply, and fan fault status and port operational status. Figure 1-4 shows
the unit components and options for a fully configured unit.

Ayt

opier

DECconcentrator 500 Installation

500
Figure 1-4: Fully Configured DECconcentrator

Controller /Backplane
Power Supply

Card Cage

Circuit Breaker
Power

DECconcentrator 500
Chassis

Network
Management
e
Board

i
-

(DEFCN-MA) B

Dual Fans
Port Board

fDEFCN-*NA)
DEFCN-LA Not Shown)

(Shown with Cover Off)
LKG-4384-90A

1.2.1

Card Cage

The card cage contains three slots for option boards. The DECconcentrator 500 can be
configured with up to three Port boards, or one Network Management board and up to two
Port boards. Installed option boards inserted in the card cage connect to the Controller/
Backplane through 120-pin connectors. A Port board can be installed in any slot. A Network Management board, if used, must be installed in the top slot. If a Network
Management board is installed in slot two or three, the board does not operate and the
fault LED blinks.

A Port board is the same as DEFCN-NA or DEFCN-LA. A Network Management board

is the same as DEFCN-MA. For additional option boards, see any option board installa-

tion documentation shipped with the concentrator.

—

Introduction

1-5

Table 1-1 lists the option configurations in the DECconcentrator 500 and the number of

possible station connections.

Table 1-1:

Option Board Configurations
Network
Management

Number of

Port Board
(4 ports)

Board
(2 ports)

Possible
|
FDDI Stations

Connection
to Dual Ring

1 board

None

2 boards

None

3 boards

None

1 board

None

1 board

None

Yes

1 board

Yes

2 boards

1 board

2 boards

1 board

Yes

s
s

Note: A DAS or concentrator can be connected to a port as a single attachment device.

1.2.2

Controller/Backplane

All option boards plug into the Conubller/Backplane.The Controller/Backplane has

three 120-pin connectors for option boards and a 60-pin connector for the power supply.
A 20-pin connector provides a test connector for Digital field level testing. The Control-

ler/Backplane:
e

Distributes power from the power supply to the option boards.

Provides the data path interconnect between the option boards.

Distributes clock and processor control signals from the Controller/Backplane to
the option boards.

Contains a microprocessor that executes all diagnostic and operational firmware.

All diagnostic and operational firmware can be upgraded through the FDDI network.
Self-test diagnostics reside in firmware on the Controller/Backplane and test the fan,

power supply, Controller/Backplane, Port board(s), and Network Management board.

fe
T

1-6

DECconcentrator 500 Installation

1.2.2.1

Logic

The Controller/Backplane active logic includes:

EEPROM (2K by 8) for error logging and storing nonvolatile parameters.

Clock source and distribution.

68000 microprocessor running at 6.25 MHz with RAM (32 K by 16), boot

ROM (32K by 16), and flash EEPROM (256 K by16) for program memory. A

portion of the flash EEPROM is used for remote down-line upgrade of code.

Microprocessor support logic for interrupts, programmable timers, watchdog

Refresh timer to support DRAMin packet memory. Packet memory is resndent

timer, and bus time-out.

on the Network Management board.

1.2.2.2 Data Path
—
P
—

Transmit and receive data paths leave the option boards and pass through the 120-pin
connectors to the Controller/Backplane. The Controller/Backplane processor connects
the transmit and receive data paths from each option board. To maintain the token ring
data path, the data path connecting option boards can internally bypass empty slots or
slots with faulty modules. The data path has a ring scrubbing function and parity to permit

detection of connector-related faults.

1.2.3 Port Board (DEFCN-NA, DEFCN-LA)

The Port board contains all the hardware for four ports of the FDDI physical connection

trols the Port board.

Digital Equipment Corporation offers several types of Port boards, for example: the
FDDI PMD standard-compliant Port board and the Low Power Port board. The Port

r
M

type M. Single attachment stations and dual attachment stations used as single attachment stations connect to the Port board. Looking at the Port board from the connector
side, the ports are labeled 1-4 from left to right. The Controller/Backplane processor con-

board (DEFCN-NA) has four ports for FDDI PMD connectors and is ANSI X3T9 compliant. The Low Power Port board (DEFCN-LA) has four 2.5 mm ST-type connectors.
This board is ANSI X3T9 compliant except for the connector type and maximum cable
attenuation.

Introduction

1.2.3.1

Diagnostics and LEDs

The front panel on each type of Port board has five light emitting diodes. One LED
provides board fault status. The other four LEDs provide port status information. If system
diagnostics detect a broken port, that port is bypassed and the remaining ports continue
to

operate in the FDDI token ring. In this case, the port status LED tumns off and
the Port

board fault LED turns on. If the system diagnostics find that all the ports are faulty,
the
entire board is bypassed on the backplane and the Port board fault LED tumns on.
1.23.2

Data Path

Data received by a port passes to the next port for transmission. Data received by
Port 4
passes to the backplane and from there to Port 1 on the next Port board. The Port
board
also performs data encoding/decoding and clock recovery functions.

1.2.4

Network Management Board (DEFCN-MA)

Wity

The Network Management board provides the DECconcentrator 500 with A- and B-type

ports, a null port, the FDDI MAC function, a unique hardware address, and
memory for the concentrator. The Network Management board contains all the

packet

hardware

to support the connection through the A and B ports to a dual ring. Or, you can
connect

the B port to an M port of another concentrator in a tree. The Controller/B ackplane controls this board.
|
1.24.1

Front Panel

The front panel has two ports, a red board fault status LED, a red/green port status
LED
for each of the ports (labeled A and B), and a green LED to indicate ring operation
al status. The ring operational LED is a MAC layer status indicator.

A label on the handle of the board lists the unique hardware address that is resident
in
ROM on the board. The hardware address lets the concentrator participate as an addressable station on an extended LAN. This means the DECconcentrator 500 can
receive

management information from other stations on the network.

The two dual-position switches are located on the front panel. The left-hand switch

(switch 1) is a software-readable switch used to reset o default control parameters that

can be changed by remote management. The right-hand switch (switch

2) is a software-

readable switch used to enable/disable remote management write access

firmware upgrade.

functions and

e
i

ARy

1-8

DECconcentrator 500 Installation

1.2.4.2

Physical Layer Hardware

The Network Management board physical layer hardware includes the null port, and
Ports A and B. The internal null port provides a mechanism for bypassing the concentrator MAC function. The A, B, and null ports may be bypassed for fault isolation just as
ports on the Port board can be isolated. The null port is internal and is not visible.
1.243

Data Path

The data path entering the Network Management board from the backplane goes to the
null port, to Port B, to Port A, and then returns
to the backplane. Looking at the Network
Management board from the connector side, the ports are labeled A and B from left to
right. Connector keying and a software-controlled state parameter distinguishes A and B
ports from the type M ports of the Port board.

1.2.4.4

Data Link Layer Hardware

The Network Management board Data Link Layer hardware provides the FDDI MAC
function, unique hardware address ROM,and packet memory. The implementation of the
MAC function includes the ability of the concentrator to recognize multiple 48-bit addresses. The unique hardware address is in ROM, other destination addresses are held in
RAM and can be changed through software.

The packet memory is used for queueing transmit and receive frames. Parity generation
and checking protect packet memory. Packet memory is accessible to the processor and
to the memory controller that interfaces the MAC to packet memory.

1.2.5

Power Supply

The 154 watt power supply drives two fans and delivers power to the Controller/Backplane and option boards. See Section D.1.4 for the power supply specifications. The power supply also supports:

One green LED (power supply OK) and two red LEDs — the green LED goes
on when power is applied to the wiring concentrator. The first red LED goes on
if there is a problem with the fan. The second red LED goes on during power up

and remains on if there is a problem with the Controller/Backplane.

Thermal protection — provides auto shutdown of the unit if the operating tem-

Auto voltage select (AVS) — permits use of the wiring concentrator at 110-120
volts and 220240 volts without setting a voltage select switch.

Introduction

perature exceeds S0°C (122°F).

1-9

1.2.6

Controls and Indicators
Table 1-2 describes the DECconcentrator 500 controls. Figure 1-5 shows a concentrator’s controls, indicators, and connectors for a fully configured unit. Table 1-3 describes

the function of each LED.

Table 1-2:

DECconcentrator 500 Controls

Control

Description

ac power socket

Provides connection to ac power source.

Circuit breaker

Provides overcurrent protection for the wiring concentrator. The white center of the circuit breaker pops out if the
circuit breaker trips. The ac power is cut off to the wiring
concentrator when the circuit breaker trips. Pressing the
white center resets the circuitbreaker. The circuit breaker
trips at 4 amps.

Network Management Reset to

When ON during power up, enables reset of system parameters that have been changed through remote management (DECelms). See Chapter 3 for more informa-

Default switch (shipped with
switch OFF)

tion about these switches. To reset to the default setting:
1. Set the switch to ON.
2. Cycle power and wait for the self-test to complete.
3. Set the switch to OFF.
Network Management Write
Access Enable switch (shipped
with switch OFF)
|

Use this software-readable switch to enable or disable remote management write access to the system control parameters and firmware upgrade. When ON write access
is enabled.

1-10

DECconcentrator 500 Installation

Figure 1-5: DECconcentrator 500 Controls and Indicators
Network Management

Circuit Breaker

— Controller/Backplane Fault LED

Detaults

— Fan Fault LED

Right: Write Access

Enable/Disable)

)

AC Power

@®

= Port Status LED

=FaultLED

_ Power Supply DC OK LED
‘

Connector

Reserved
for Digital
Manutacturing

[ = Connectors
LKG-3786-801

Table 1-3:
icon

DECconcentrator 500 LEDs

LED

State

OFF

Red

Controller/Backplane

fault

===

Normal

Color

Power supply DCOK

Description

" Indicates the operational state of the Controller/
Backplane. If ON, then there is a fault with the
Controller/Backplane. In this case the concen-

trator will not go on-line in the network.

Green ON

Indicates the operational state of the power

supply. lf OFF, then there is a problem with the
power supply.

Fan fault

Ring Ring operation
OK

Red

OFF

Green ON

Network Management Red
board fault

OFF

Indicates the operational state of the fan. If ON,

then there is a problem with the fans.

Indicates the operational status of the ring. If

ON, then the ring is operating.

Indicates the operational state of the Network
Management board. If ON, then there is a prob-

lem with the Network Management board.

pHy

Network Management Green Green ON Indicates the operational state of the Network
Management board port(s).
/Red
port status

Port board fault

PHY

Port board port status

Introduction

Red

OFF

Indicates the operational state of the board. If

ON, then there is a problem with the Port board.

Green Green ON Indicates the operational state of the Port board

/Red

port(s).

-1

1.2.7

Operational Software
Following power up or a software initiated reset of the wiring concentrator, system
initialization software tests and initializes the hardware. This includes configuring around
or isolating any faulty hardware. After initializing the hardware, the functional software

starts executing. Following a successful initialization, operational software controls the

hardware to provide:
*

FDDI token ring function

Support for reception, processing, and transmission of remote management,
maintenance operations protocol (MOP) packets, and station management
(SMT) packets

On-line diagnostic functions

Volatile and nonvolatile error and data logs

Ring management and ring fault handling (FDDI Station Management)

Refer to the DECelms documentation for network management functions and capabilities.

1-12

DECconcentrator 500 Installation

Preparing for Installation

2.1 Unpacking and Checking the Contents
A single DECconcentrator 500 shipment consists of one or more boxes depending on the
additional optional equipment ordered (Figure 2-1).

CAUTION 2\
Static electricity can damage modules and electronic
components. Digital recommends you use a grounded
wrist strap and grounded work surface (Digital P/N
29-11762) when you handle any modules or internal
parts.

Do not remove any additional option boards you may have from their anti-static bags until instructed to do so in the installation procedure.
1.

Unpack and check the shipment for damage and missing parts.
Make sure the power cord matches your wall outlet (Figure 2-2).

In case of damage, contact your delivery agent and your Digital sales
representative.

In case of missing parts, contact your Digital sales representative.

Check the model and serial number of the wiring concentrator (Figure 2-3) and
record the numbers in the DECconcentrator Identification List found in Appendix F.

Save all packaging material. To prevent damage, repack the unit or parts in the
original packing material when transporting or shipping the unit.

2-1

Figure 2-1: Checking the Shipping Box Contents

(Optional)

O g&tfl'ation

You may have different or additional
NOTE

EK—DEFCN—OP

loopback connectors. See the option
board installation guides (if any) that
shipped with the concentrator.

[0 Option

Board
DEFCN—-MF
DEFCN—NF
DEFCN—LF

[0 Fiber Optic Loopback

P/N 12-32005-01 or
P/N 17—-02970-01

[J Rack Mount Kit

E[j

— [ DECconcentrator 500

P/N HO41—AE

Instaollation Guide
EK-DEFCN-IN

- [] Warranty
V\’

L] DEFCN-AX

] DEFCN-BX

[] Power Cord

(Country—specific)
sy

LKG—4385—-90A

2—-2

DECconcentrator 500 Installation

Figure 2-2:

U.S.A. and International Power Cords

Power Cable

15 V

%
LKG-3798—90A

WARNING 2\

For continued protection against risk of electric shock,

only connect this product to a three-wire wall receptacle

The DECconcentrator 500 switches automatically to 110/120 Vac and 200/240 Vac. No

that is connected to the building’s safety earth ground.

—

user action is required to set the voltage. Table 21 lists the order number for the interna-

tional power cords.

Table 2-1:
.

—

Order

Number

BN20A-2E

BN20B-2E
BN20C-2E

—

BN20D-2E

Country

Preparing for Installation

Order

Number

Country

U.S.A, Canada

BN20F-2E

Switzerland

Japan

BN20H-2E

Denmark

Australia, New Zealand

BN20J-2E

Italy

Belgium, Finland, France, West

BN20K-2E

India, South Africa

Ireland, United Kingdom

BN20L-2E

Israel

Germany, Holland, Norway,
Spain, Sweden
BN20E-2E

International Power Cords

2-3

e ———

Figure 2-3: DECconcentrator 500 Order and Serial Numbers

[

Network Management
Option Board (DEFCN—MA)

Tabletop

DECconcentrator 500

aflfn :,Z?n ber

DEFCN-—-BX

Network Management
Option Board

‘

Rack Mount
DECconcentrator 500
DEFCN—AX

Port Option Board ‘

gDEFCN-—-NA)

DEFCN—LA)

LKG—4366—-90A

NOTE
ot

Record the model and serial numbers on the
DECconcentrator Identification List found in

Appendix F.

The DECconcentrator 500 unit is available as DEFCN-AA, DEFCN-AB, DEFCN-

BA,
DEFCN-BB. The option boards are available as DEFCN-MA, DEFCN-NA and
DEFCN.LA. You may have different options boards installed in the concentrator. In
this case, see
the option board installation guides shipped with the concentrator for informati
on. See
your sales representative for additional variations.
e

DEFCN-Ax is for use in a rack. Ax models do not have plastic covers.

DEFCN-Bx is for use on a tabletop. Bx models have plastic covers.

The -xA models contain a U.S. power cord. The -xB models are for

applications
outside of the United States and Canada and have no power cord. The required

power cord must be ordered separately.

2—4

The xA option boards are factory installed, -xF option boards are field

installed.

DECconcentrator 500 Installation

2.2 Site Preparation

You need to make sure that the installation site meets the physical, environmental, power,

and cabling requirements for the DECconcentrator 500.

Refer to Section 2.2.1 and Section 2.2.2 to make sure the site is ready to install the concentrator. See Section 2.2.3 through Section 2.2.5 for configuration information. See Appen-

dix D for operating, environmental, and power requirements for the unit.
Note that each cable in a fiber optic cable plant should have a unique identification number recorded on a tag attached to the cable. Testing and certification information about the

cable should have been recorded in the cable plant log book. Figure 2-4 shows a sample

—

cable plant log book entry.

pan

,
»

Figure 2-4: Sample Cable Plant Log Book Entry

Fiber

Fiber Size | Fiber | OTDR

Label

BO2H02/01|

Corrected| CertifiLoss
cation

and Color | Length | 850/1300 | 850/1300 | Date

62.5/125

500M | 1.8/1.3

1.71.2

Operator|

8/14/89 | J.R.P

Test
Equipment

|OTDR/11
LKG-3815-801

2.2.1

Site Preparation Checklist
Use the following checklist to make sure the site preparation is complete.

Hardware

The DECconcentrator 500 is usually the first FDDI device to be installed.

Make sure that the fiber optic cables are installed, tested, tagged, and certified.

In the log book, note the fiber length and corrected loss (refer to Figure 2—4).

]

If the DECconcentrator 500 is to be connected to a bridge, make sure the appropriate bridge is installed and the required bridge-to-DECconcentrator 500 cabling

is in place.

If the DECconcentrator 500 is to be connected to an end station (such as a worksta-

tion or server), make sure the device is installed and the required device-to-

—

DECconcentrator 500 cabling is in place.

Preparing for Installation

o_5

Suitable Environment

Make sure that the power outlet matches the power requirements of the

DECconcentrator 500 and:
e

The outlet is within 1.8 meters (6 feet) of the installation site.

The circuit is a 15 or 20 amperes dedicated single phase (three-wire) cir-

cuit; U.S.A. and other countries.

For 120 Vac operation, the typical input current for wiring concentrator is 1.6

ARMS at 88 VRMS line.

For 240 Vac operation, the typical input current for the wiring concentrator is 0.92
ARMS at 176 VRMS line.
The circuit breaker trips at 4 amperes. See Appendix D for additional power re-

quirements.

Make sure the temperature, altitude, and humidity ranges are correct.

NOTE
The DECconcentrator 500 runs cooler without a plastic

cover. If the temperature is normally above 35°C (95°F)
and the unit has a plastic cover, remove the cover.
P

Make sure there is adequate ventilation and space for maintenance.
W,

Service

Make sure the (optional) service contracts are in place. Call your Digital sales representative for information on available hardware and software services to sup-

port the DECconcentrator 500. See also Appendix E for a brief description of

available service options for the wiring concentrator.

2.2.2

Locating the DECconcentrator 500
As long as the environmental and power requirements are met, you can place the

[

DECconcentrator 500 on adesktop, in arack or distribution frame, orina computer room.
The desktop version comes with a plastic cover; the rack mount version has a metal chas-

sis and mounting brackets.

llsson i

Digital recommends a dual ring of trees topology with the dual ring contained within the
main distribution frame (MDF) of the cable plant.

2—6

DECconcentrator 500 Installation

2.2.2.1

Office installation

Make sure the location is at least 45 centimeters (18 inches) above the floor surface.

Allow at least 10 centimeters (4 inches) of airspace around the DECconcentrator
500.

Place the DECconcentrator 500 away from direct sunlight, and heaters, as well
as photocopiers and other magnetic devices.

2.2.2.2

Rack Mount Installation

You can install the DECconcentrator 500 in a standard 48-centimeter (19-inch) rack or
RETMA rack cabinet. Digital Equipment Corporation and other major manufacturers of
electronic equipment use standard-sized racks. The rack and cabinet rails, mounting hole
patterns, and spacing conform to international standards that allow compatibility with
products manufactured by Digital and others in the industry.
2.2.2.3

Satellite Distribution Frame Installation

If you are installing the DECconcentrator 500 in a standalone satellite distribution frame
(SDF) or as part of a DECconnect System installation, refer to the DECconnect System

Fiber Optic Installation guide.

The SDF is a component of the Digital DECconnect System. The SDF provides a central
location for communication devices that connect fiber optic networks, ThinWire Ethernet, and twisted-pair cable to a standard Ethernet network. The SDF can also be configured as the center of a standalone network.
2.2.3

Configuration Rules

Observe the following cable configuration rules when you install any FDDI device into
an FDDI network:

The maximum cable length between any two stations varies depending on the
type of installed option board. Refer to Table 2-2 for correct distances. For maximum cable distance for other types of option boards, refer to the appropriate
option installation guide shipped with the concentrator.

You can install up to a total of 500 stations on an FDDI network. However, Digital recommends 100 stations on an FDDI network.

You can have a total maximum cable length of 100 kilometers (62 miles) using
dual-fiber cable. You can have a total maximum cable length of 200 kilometers
(124 miles) using single-fiber cable.

Preparing for installation

2-7

If you have an installed DECconnect System fiber optic cable plant,
then color-keyed fiber optic cable connectors and FDDI device connectors aid in the proper
installation of
cables. See the DECconnect System Fiber Optic Planning and Configur
ation and
DECconnect System Fiber Optic Installation guides for more informat
ion.
R

Table 2-2:

Maximum Cable Lengths

From

Maximum Cable Length

Bridge

Concentrator

2 km (1.2 mi) to an installed Port board

1 km (.62 mi) to an installed Low Power Port board

Concentrator

2 km (1.2 mi) to any installed Network Management board and
Port board
1 km (.62 mi) to an installed Low Power Port board

Concentrator

Station

2 km (1.2 mi) from an installed Port board or Low Power Port
board

1 km (.62 mi) to an installed Low Power Port board
ac outlet

Concentrator

1.83 m (6 ft) country-specific
ol

2.2.4

Available Fiber Optic Cables
Digital recommends that new installations be wired with 62.5/12

5 Graded Index Multis General Specification

mode Optical Fiber (dual window) that conforms to Digital’

171002-XX. Your cable installer should provide proof of complia

nce.
Al

Digital sells two fiber optic cables for indoor wiring use: BN25J
-XX general purpose and
BN25K-XX plenum cable.
e

Both these dual-fiber cables use 62.5/125 graded index multimo

1300 nm wavelengths. Both cables terminate with either

de optical fiber and use
FDDI PMD connectors or 2.5

mm ST-type connectors. Use FDDI PMD connectors with a Port
board and Network
Management board. Use 2.5 mm ST-type connectors with a Low
Power Port board and to
connect the cable to the patch panel.

There are four types of keyed FDDI PMD connectors. Keyed slots

on one face prevent
t and recejve lines are

accidental inversion of the connector. This ensures that transmi

properly aligned and that devices are connected correct

ly to the FDDI network.

2.2.5

Reconfiguring and Installing Additional Cables

If you are reconfiguring or installing additional cables, see the DECcon
nect System Fiber
Optic Planning and Configuration guide before you begin.
See the DECconnect System
Fiber Optic Installation guide for information to install fiber
optic cable runs. Appendix
C briefly describes the wiring concentrator optical system and
some basic guidelines regarding the fiber optic link.

2-8

DECconcentrator 500 Installation

3
Installation

3.1

Introduction
This chapter describes how to install the DECconcentrator 500. Chapter 4 describes how
to make sure the unit is operating correctly.

WARNING A\
To avoid bodily injury or damage to the equipment, do
not connect the power cord or any other cable until you
are instructed to do so in the following procedures.

Do not apply powér to the unit unless all covers are installed.

3-1

3.2

Identifying Option Boards
Begin by identifying the option board in the concentrator and any option board you may

have to install. Figure 3—1 shows a Network Management board, Port board, and Low
Power Port board. Note that:
*

A Network Management board has two ports and two switches.

Always install a Network Management board in the top slot. If any type of Port
board is installed in the top slot, reinstall the Port board in another slot.

If a Network Management board is installed in slot two or three, the board does

not operate and the board fault LED blinks red.

A Port board has four ports and no switches.

A Low Power Port board has four pairs of 2.5 mm ST-type fiber optic connectors and no switches. Transmit and receive icons are located on the handle by

each pair of connectors.

A Port board can be installed in any option slot.
BRI

A generic option board installation procedure is included in Appendix B.
The DECconcentrator ships from the factory with the board configuration you ordered

already installed. You will receive additional option boards only if you ordered them separately. You may have another type of Network Management board or Port board. To
identify these boards, see the option installation guide shipped with the concentrator.
If you have

And

No options to install

A tabletop unit (plastic cover)

No options to install

A rack mount unit

Then go to
| Chapter 4
Section 3.4

A Network Management board
option to install

Appendix B or the option installation guide shipped with
the concentrator.

A Port board or Low Power Port

Appendix B or the option installation guide shipped with
the concentrator.

board option to install

NOTE
The DECconcentrator 500 runs cooler without a plastic

cover. If the temperature is normally above 35°C (95°F)
and the unit has a plastic cover, remove the cover. See

Section 3.4.1.

3-2

DECconcentrator 500 Installation

Figure 3—1: Sample Option Boards

Port A

Port B

bual Switch

Port 3

Network Management
Option Board

DEFCN—MF)

Port Option

Board (DEFCN—NF)

Low Power Port
Option Board

(DEFNC—LF)

LKG—4387—-90A

Installation

3-3

3.3

Checking the Network Management Board Switch Settings
To check the Network Management board switch settings, do the following:

Make sure the switch settings match the factory settings shown in Figure 3-2

and described in Table 3—1. Three types of switches are shown. The switches on
the Network Management board could be any one of the three types.

NOTE
Use a pointed tool to change switch settings. Neveruse a
pencil; graphite can damage switches.
2.

Record the switch settings and the hardware network address (located on the
handle of the board) in the DECconcentrator Identification List (Appendix F).

NOTE

The concentrator must be set to the default parameters in

order to test all the ports. If you are reinstalling the unit,
make sure to reset switch 1 (reset to default setting).

Table 3—1:
Switch

Network Management Board Switch Setting
|

1 (reset to
default

Default

Setting

Function

OFF

When OFF at power up, no action occurs.

parameters)

When ON during power up, enables reset of system parameters

that have been changed through remote management
(DECelms). For example, if remote management has disabled a
port, that port is no longer disabled when you reset to the default
parameters.

To reset to the default parameters after the concentrator is in-

Abiipmonic

stalled and operational, or after being reinstalled, do the following:

2 (write

enable/disable)

OFF

Set switch 1 to ON.

Cycle the power and wait for self-test to complete.

Set switch 1 to OFF.

When setto ON, enables write access for system control parame-

ters such as the password and firmware upgrade parameters.

3-4

DECconcentrator 500 Installation

Figure 3-2: Checking the Network Management Board Switches

Bl =Default Setting

ON 55
LKG— 3801-90A

Installation

3.4 Installing the Unit in the Rack
The DECconcentrator 500 can be mounted in a standard 48-centimeter (19-inch)

RETMA rack cabinet using the rack mount kit provided with the wiring concentrator.

Rack mounting the concentrator requires:

Removing the concentrator’s plastic COver if present.

Attaching the rack mount brackets to the concentrator.

Installing the u-nuts on the cabinet rails.

Installing the concentrator in the rack.

Install the concentrator in the rack so that the back of the unit (with the cable connections)

is visible to the operator for monitoring the status LEDs.

NOTE
Although one person can install the concentrator in a
rack, two people supporting the concentrator makes the
task easier.

NOTE
DA

The air inside an enclosed rack can be hotter than the
ambient room temperature. Make sure that the air entering the DECconcentrator 500 does not exceed the maxi-

mum intake temperature of 50°C (122°F).

3-6

DECconcentrator 500 Installation
ol

3.4.1

Removing the Plastic Cover
If the unit has a plastic cover, remove it from the unit as follows:

Place the concentrator upside down on a sturdy surface or the floor.

Remove the eight screws from the bottom of the unit, then, remove the plastic
cover (Figure 3-3). Store the cover and associated hardware for possible future
use or reconfiguration.

CAUTION

Do not reinstall the cover screws into the wiring concentrator’s metal chassis. Doing so could damage the wiring
concentrator.

Figure 3-3: Removing the Plastic Cover
Screws for Feet —\

Rubber Feet \g

Screws to Chassis

y |

LKG-3804—-90A

installation

3-7

3.4.2

Installing the Rack Mount Brackets

Install the rack mount brackets as follows:

KOS

—
—

Remove the six screws from the sides of the chassis adjacent to the back of the

wiring concentrator. Save the screws for future use.

Install the rack mount brackets. Use the six 8—32 Phillips-head screws with lock
washers provided in the rack mount kit (Figure 3—4).

Figure 3—4: Preparing the Unit for Mounting

LKG-3805-00A
ARG,

Ay,

ORI

DECconcentrator 500 Installation

3.4.3 Preparing the Rack
To prepare the rack, do the following:

Determine where you want to mount the wiring concentrator in the rack. Allow

Attach the four u-nuts to both rails at the front of the cabinet (Figure 3-5).

2.54 centimeters (1 inch) spacing between mounted devices.

j
¥

000000000,

/)]

7 Holes

& ed
0000000007
Fes 0oC 7000000000000

bo
o oc

Figure 3-5: Preparing the Rack

Mounting Bracket

(Shown for

Reference Only)

Front of Cabinet

NOTE

Always leave at least 2.54 cm (1 in) of space between

mounted devices for passing cables to the back of rack.
LKG-3806-90A

Installation

3-9

3.4.4

Mounting the Unit in the Rack

To mount the unit in the rack, do the following:
1.

With one person supporting the front of the unit, slide the unit into the rack
from the front of the cabinet. Make sure the back of the unit with the cable connections is visible to the operator for monitoring the LEDs (Figure 3—6).

Fasten the rack mount brackets to the u-nuts on the cabinet rails. Use the four
10-32 Phillips-head screws with lock washers provided in the rack mount kit.

Go to Chapter 4. DO NOT connect any cables until instructed to do so. You

are now ready to test the wiring concentrator and connect the cables.

Figure 3—-6:

Installing the Unit in the Rack
G

(4) 10-32
Phillips—Head Screws

ol fineol

Jooocolaloo

I—

fise

ol /ooccoc

with (4) Lock Washers
NOTE
Always leave at least 2.54 cm (1 in) of space between
mounted devices for passing cables to the back of the rack.

LKG—-3807--80A

3-10

DECconcentrator 500 Installation

Checking the Wiring Concentrator

4.1

Introduction

This chapter describes checking the operational status of the DECconcentrator 500, all
ports, and connecting the power and fiber optic cables to the wiring concentrator.

You can add a DECconcentrator 500 to an existing FDDI network at any time, although
adding a wiring concentrator disrupts network traffic. Therefore, Digital recommends
that you add the concentrator when you know that there will be little or no use of the net-

work. Also, make sure you notify the appropriate personnel of this disruption.

To check the DECconcentrator 500 installation do the following:
1.

Run the self-test. Applying power to the DECconcentrator 500 starts the self-test
(Section 4.2). This procedure checks the internal circuitry and operational status
of the DECconcentrator 500 and any installed option boards.

Run the loopback test. After the self-test is completed, installing a loopback
connector on a port starts the loopback test. Test each port and observe the condition of the port LED. This procedure checks the ability of the individual port
to transmit and receive optical pulses (Section 4.3).

Connect the fiber optic cables to the ports and test the connections (Section
44.1).

o
-

Fill in the DECconcentrator 500 Identification List in Appendix D and give a
copy to the system/network manager to keep with the network records.

Procedures here describe using FDDI PMD and 2.5 mm ST-type loopbacks and connec-

—
Lo

tors. See the instructions included with the option installation guide(s) shipped with the
concentrator for installing other types of loopbacks and connectors.

4.2

Running the Self-Test

The DECconcentrator 500 unit does not have a power

on/off switch. Plugging in the power cord applies power directly to the concentrator and
initiates the self-test. The
DECconcentrator 500 switches automatically to 100/12
0 Vac or 200/240 Vac. No user
action is required to set the voltage.

4.2.1

EL
T

Connecting the Power Cord
To connect the power cord, do the following:

WARNING
To avoid bodily injury, use care when connecting
concentrator power cord. Regulations in some

the

countries

may require an authorized person to connect the

power.
Wi

Make sure you connect the power cord to a ground

wall outlet.

Make sure the power cord plug matches the wall

Plug the power cord into the concentrator first

outlet.

and then into the wall outlet or

appropriate power source receptacle (Figure 4—1

Figure 4-1: Connecting the Power Cord

tienoio;

o
s

LKG—3816—-90A

4-2

DECconcentrator 500 Installation
SO

Observe the power, fan, and Controller/Backplane LEDs and the option board
LEDs to make sure the unit is operational.

After power up, allow 15 seconds for the self-test to complete. Then, compare
~ the state of the LEDs on the concentrator with those shown in Figure 4-2.
Figure 4-2 shows the normal state of the LEDs after a successful self-test.

All LEDs normally go ON for the first 2 seconds of the self-test. The Controller/Backplane LED goes ON and remains ON during the self-test.

Figure 4-2: Checking the Operational Status

Controller/
Back—

® =OFF

{} = ON (Green only;on solid)

{

= ON (Green only;blinking)

plane Fan

LED

Powe

o o 1
LED

JmEeimEedmbes

Board
fgtgt

PortA
LED

PortB
LED

Ring
Oper-

ational
LED

—\

OD\DDD

Board
Eg%lt

Port 0

LED

IF:
- The LEDs do not match those
shown here.

Checking the Wiring Concentrator

Port 2

LED

Port3

LED

Port Board(s)

Network Management Board
IF:
The LEDs match those shown here.

Port 1

LED

Then:
The DECconcentrator 500 wiring concentrator
is operational; go to Section 4.3.

Then:
Go to Chapter 5.
LKG-3787-901

4-3

4.3

Running the Loopback Test on Each Port
Run the loopback test after successful completion of the self-test to check the

and receivers. The port status LED should be blinking green before you start

test. Run this test on each port using the following procedure:

transmitters
the loopback

WARNING 2\

Some fiber optic equipment emits laser light that can injure your eyes. Never look into an optical fiber or con-

nector port. Always assume that the cable is connected
to a light source.

Remove the protective cap or rubber boot from the port and loopback connector

Do not touch the fiber; doing so can damage the fiber.

Connect the loopback connector to the port that you are testing. Use the appropriate loopback connector for the port you are testing(Figure 4-3). The 2.5 mm

ST-type loopback connectors are keyed. Insert each end so that the key is
up.
Push firmly in place.

Figure 4-3: Connecting a Loopback Connector to a Port

LKG~4368-90A

DECconcentrator 500 Installation

Observe the port LED. The LED should blink red. This means that the port cantransmit and receive optical signals. When you remove the loopback connector,

Figure 44 shows Port A being tested with the loopback connector.

the LED blinks green.

Figure 4-4: Port LED Status During Loopback Testing
p—

Controller/

—

{'} = ON (Green only;on solid)

$% = ON (Red only;blinking)

EEE - Loopback Connector

Board

Fault

LED

LED LED LED

PortA

LED

PortB

LED

oS
" JmEeimEeImEeImE

Network

Board

LED

Activity

Fault

Port O

LED

Port 1

LED

Port 2

LED

Port 3

LED

Network Management Board

Port Board(s)

The LEDs match those shown here.

The wiring concentrator port is operational.Test the

IF:

THEN:

|
o

plane Fan Power

= ON (Green only;blinking)

Back-

-OFF

The LEDs do not match those

next. When all ports are tested, go to Section 4.4.
Go to Chapter 5.

shown here.

Checking the Wiring Concentrator

4-5

4.4

Attaching Fiber Optic Cables

To attach fiber optic cables, you need to:
1.

Identify the connector and port type

Connect the cable to the appropriate port

Observe the port status LED

4.4.1 Identlfying Fiber Optic Cable Connectors
O

Use keyed FDDI connectors with FDDI PMD ports (Figure 4-5). Use 2.5 mm ST-type

connectors with low power ports.The concentrator has M-type ports on the Port boards,

and A- and B-type ports on the Network Management board. Use the connection rules in

Table 4-1 when you connect the cables.

NOTE

The ferrule on the transmit end of the 2.5 mm ST-type
fiber optic cable connector should measure 7.89 mm +
025 mm (.310 + .001 in) in length. Shorter ferrules can
cause less power to be launched into the fiber.

Table 4-1:

ARG

Connection Rules

Connecting Nodes

This Node

Port Type

Other Node

Yes, rule 11

Yes

Other Node

Yes, rule 22

Yes

Other Node

Yes, rule33

Yes,ruled4

Yes

OtherNode

Yes

1 Connection Rule 1: This Node Port B can connect to Port A of Other Node if, and only if,

This Node Port A is connected to Port B or Port S of another station, or is unconnecte

2 Connection Rule 2: This Node Port A can connect to Port B of Other Node if, and only if,
This Node Port B is connected to Port A or Port S of another station, or is unconnecte

3 Connection Rule 3: This Node Port A can connect to Port M of Other Node if, and only if,

This Node Port B is connected to Port A or Port S of another station, or is unconnecte
d. If
This Node Port B is connected to Port A of another station, it immediately disconnects
when

This Node Port A connects to Port M of Other Node.

4 Connection Rule 4: This Node Port B can accept connection to Port M of Other Node. If

This Node Port A is connected to Port B or Port M of another station, it immediately
disconnects when This Node Port B connects to Port M of Other Node.

RHAY

WIS

4-6

DECconcentrator 500 Installation

Figure 4-5: Connector Types for FDDI Devices
Keyed FDDI PMD Connector

2.5 mm ST-type Connector

&Receive

Transmit

FDDI PMD Keying

Receptacle Keying

Plug Keying
Inserts into

== A Only

Bony

Receptacle Keying

Plug Keying

Inserts into

M Only

"] ABM,ors
LKG-4369-9

4.4.2

Connecting Fiber Optic Cables

Digital recommends you use Digital’s FDDI-to-FDDI patch cables (BN24B-XX),
FDDI-to-2.5 mm ST-type patch cables (BN24D-XX), or 2.5 mm ST-type-to-2.5mm STtype patch cables. Use the following procedure to connect fiber optic cables.

cauTion A
Make sure that the bend radius of any fiber optic cable is
7.5 centimeters (3 inches) or greater.

Pull the protective caps or rubber boot from the port and fiber optic cable plug.
Do not touch the fiber; doing so can damage the fiber.

Refer to Table 4-1 to connect the fiber optic cable to the appropriate connector.
Figure 4-6 shows how to connect FDDI-keyed and 2.5 mm ST-type connectors
respectively. Use the following guidelines:
—

Bridges, workstations, and other single attachment stations connect to the

M ports on Port boards.

Checking the Wiring Concentrator

4-7

A concentrator or dual attachment station participating in a dual ring con-

nects to the dual ring through Ports A and B on the Network Management
board. Cabling goes from Port B of the upstream concentrator or DAS to
port A.
il

In a dual ring of trees, a concentrator or DAS B port connects to a concentrator M port.

Connect the fiber optic cable to the appropriate connector. Note that:
Digital cables BN24B-XX and BN24D-XX have colored key markers on
the top of the plug; use red for A-type ports, blue for B-type ports, and
green for M-type ports.

To prevent connecting 2.5 mm ST-type cables incorrectly, make sure to

match the icons on the cable with the icons on the option board.

Figure 4-6: Connecting Keyed FDDI Cables and 2.5 mm ST-type Cables
P

i 05

LKG—4370-90A

ALY

PGS

DECconcentrator 500 Installation

Figure 4-7 shows connecting a concentrator in a dual ring of trees.

Figure 4-7: Connecting a Concentrator in a Dual Ring of Trees

| (A

B I—1A

CON
M

Workstation
|

CON

B
CON

CON = DECconcentrator 500

Observe the LEDs as you connect the fiber optic cables (Figure 4-8).

For each cable that is connected to the concentrator, add the cable identification
number to the DECconcentrator 500 Identification List in Appendix D.

Figure 4-8 assumes a fully configured DECconcentrator 500 with a device connected at

the other end of each cable. If no cable is connected to a port, the port LED blinks green.

Checking the Wiring Concentrator

4-9

Figure 4-8: LEDs: Fully Configured and Cabled DECconcentrator 500
Controller/
Back—
plane Fan
LED
LED

® =OFF

L} = ON (Green only)
&4 = Connected Cable

Power
LED
o

_JmEegmEedm

Board
Fault
LED

Port A

LED

PotB

LED

Ring

Oper—
ational

JmEegmEedmPodmEe;

Board

[‘Etélt

Port 1

LED

Port 2

LED

Port 3

LED

ety

Port 4

LED

Port Board(s)

Network Management Board

IF:
The LEDs match those shown here.

Then:
The DECconcentrator 500 wiring concentrator is oper—
ational and correctly cabled; installation is complete.

IF:

Then:
Go to Chapter 5.

The LEDs do not match those
shown here.

e E

LKG-4168-901

4-10

DECconcentrator 500 installation
A,

Problem Solving

5.1

Introduction
This chapter helps you identify and correct problems that might occur during installation
of the DECconcentrator 500 unit. The procedures described here are for diagnosing and
correcting hardware-related problems only.

As you go through these problem-solving steps, write down the symptoms, LED state,
and what you did to correct the problem. If the problem continues after you complete
these procedures:

Notify your system/network manager or authorized service repreSentative about
the problem and the field-replaceable unit (FRU) that may be faulty.

Give a copy of your problem-solving record to your system/network manager or
service representative.
Additional problem-solving information is available in the DECconcentrator 500
Problem Solving guide. Also, refer to the following items for service information.
Your warranty for information about repairs. If you do not have a service contract you may need to have a service engineer remove and return the faulty
FRU. Otherwise, see the DECconcentrator 500 Problem Solving guide for directions.

Your service contract for information about getting service and the type of service you have.

Appendix E for a brief description of the different types of service that are
available to you.

5.2

Maintenance Strategy
The following procedures assume that the problem has been isolated to the concentrator.

Identify and then replace any faulty FRU. (See the DECconcentrator 500 Problem
Solving guide for procedures to remove and replace FRUs.)

WARNING 2\
Digital Equipment Corporation recommends that only
trained service engineers perform the replacement procedures.
The FRU may be the:
Port board

Network Management board

Controller/Backplane

Fan assembly

Power supply

Circuit breaker
A

5.3

Problem-Solving Sequence

Visually check all cable connections to make sure they are properly connected.

AR
A

Use the following procedures to identify a faulty FRU:

Run the self-test.

Observe and record the condition of the concentrator LED:s.
Take the appropriate corrective action (see Table 51 through Table 5-4).

After diagnosing and correcting the problem, return to Chapter 4 to confirm the
correct operation of the concentrator.

WARNING 2\
Always remove the power cord from the unit and ac

soty

procedures.

source when performing any removal and replacement

ITS

To avoid possible personal injury, let the unit cool for 5
minutes before opening the concentrator.

5-2

DECconcentrator 500 Installation
W

Figure 5—1 shows the DECconcentrator 500 FRUs.

Figure 5-1: DECconcentrator 500 FRUs
Controller/Backplane
Power Supply
Card Cage

Circuit Breaker
Power

DECconcentrator 500
Chassis

Network
Management
Board

(DEFCN—MA)

Dual ans
Port Boards

§DEFCN-—-NA)
DEFCN—LA Not Shown)

(Shown with Cover Off)
LKG—437+-90A

Digital Equipment Corporation also recommends that you remove any port cable that

could be in the way when you service the unit.

NOTE
Reinstall all cables back in their original position; an incorrectly installed cable can cause the network to fail.

Problem Solving

5.4

Running the Self-Test
"To run the self-test:

- 2.

Disconnect the power from the DECconcentrator 500.

Reconnect the power to start the self-test.

The concentrator’s LEDs indicate the operational status of the DECconcentrator

500.
Figure 5-2 shows the normal condition of the LEDs on completion of the self-test: a fully

configured DECconcentrator 500 is shown.

LT,

NOTE
If any ports have been disabled by remote management

(DECelms), the LEDs may not light as indicated in these
procedures. The concentrator must be set to the default

parameters in order to test all ports. If you are reinstall-

ing the unit, make sure you reset switch 1 (the reset to
default parameters switch). See Table 3—1 for direc-

tions.

The DECconcentrator 500 self-test runs for approximately 15 seconds. When the self-test

starts, a/l the LEDs go on for 2 seconds while the self-test checks the LEDs, EPROMS,
EEPROMS, and the processor. The test then continues to check the rest of the
internal
circuitry.

If no fatal faults occur, operational firmware takes control of initializing the concentrat
or.
If there is a nonfatal fault, the operational firmware decides to continue or
to abort the
initialization of the concentrator. The decision to abort or continue depends on the
type of
fault detected.

Section 5.5 describes what you can do if the LED display is not normal.

5.5

Diagnosing Problems
Table 5-1, Table 5-2, and Table 5-3 describe basic problem-solving procedures

you can
follow when you encounter a problem during installation or during operation of the
con-

centrator. The symptoms described here are presented in the order that they

during the power-up self-test.

might occur

DECconcentrator 500 Installation

—

Figure 5-2: Normal LED Condition
Controller/

L} = ON (Green only)
= = Connected Cable

plane Fan Power
LED LED LED

eLo

|[eTnuRDHOn

Fault
LED

Fau!t
LED

PortA

PortB

LED

Ring

er—
?.E%nal

Port 1

LED

IF:

o
o

*
IF:
The LEDs do not match those
shown here.

Problem Solving

Port3

LED

Port 4

LED

Port Board(s)

Network Management Board

The LEDs match those shown here.

Port2

LED

Then:

The DECconcentrator 500 wiring concentrator is

operational and correctly cabled.
Then:
Go to Table 5-1.
LKG-3790-901

5-5

Table 5-1:

Basic Problem Solving by Symptom

Symptom

Probable Cause

Corrective Action

All LEDs off

Power cord connection.

Make sure the power cord Is firmly connected at both ends.

Incorrect or no power
at wall outlet.

Make sure the correct power is available
at the wall outlet. If no power is available,
check the circuit breaker for the outlet. If

necessary, connect the unit to a different

outlet.
Blown fuse at wall
outlet.

In some countries the power connector at
the wall outlet has a fuse. Replace the
blown fuse. If the problem persists, try

connecting to a different wall outlet. If the

problem continues there may be a faulty
power cable or incorrect wiring. Notify

your system/network manager.

Faulty power cord.

Use a meter to measure the continuity of
the power cord. Replace the cord if defective.

The circuit breaker
has tripped.

Check the circuit breaker. If the circuit
breaker has tripped, reset it by pressing
on the white center button. If the problem

persists,

the power supply or circuit

breaker needs to be replaced. Notify your
system/network manager.
DC OK LED is off,
any other LED on

Problem with the
power supply.

- The power supply needs to be replaced
or repaired. Notify your system/network
manager.

Fan LED is on (red)

Problem with the fan

or fan connection.

Controller/Backplane
LED is on (red) and all

option board fauit
LEDs are on (red)

Problem with the
Controller/Backplane,

Notify your system/network manager.
Notify your system/network manager.

LED, or connection
to the power supply.

DECconcentrator 500 Installation

Table 5-2: Port Board Problem Solving
Symptom

Probable Cause

Corrective Action

Board Fault LED is
on (red), other Port
board LEDs off,
unit LEDs normal

Problem with the
Port board.

The board needs to be replaced or re-

Port LED off

Port disabled by
management, LED
broken or board at
fault.

paired. Notify your system/network manager.

Set port state on through DECelms software, otherwise, use the reset to default
parameter switch. However, always make
sure to notify your system/network manager that you are resetting the parameters.

Port LED blinking
red

Unsupported
configuration or ring
topology.

Verify and reconfigure the cable connections or ring topology. Before you reconfigure, see your system/network manager
for confirmation.

Port LED red

Link Confidence Test
failure, possible cable
or cable connection

Check cable connections. Run the loopback test described in Section 5.6 to test
the port. See Table 5—4 for problem solv-

problem.

ing during loopback testing.

Table 5-3: Network Management Board Problem Solving
Symptom

Probable Cause

Corrective Action

Board Fault LED is
on (red), other Port
board LEDs off,
unit LEDs normal

Problem with the
Network Management
board.

The board needs to be replaced or repaired. Notify your system/network man-

Ring Operational
LED off

No network activity,
no token being
passed.

Indicates a network configuration problem
or problem on the network. See your system/network manager if the problem persists.

Port LED off

Port disabled by
management, LED
broken or board at

Port LED blinking red

ager.

Set port state on through DECelms soft-

fault.

ware, otherwise, use the reset to defaulit
parameter switch. However, always make
sure to notify your system/network manager that you are resetting the parameters.

Unsupported
configuration or ring
topology.

Verify and reconfigure the cable connections or ring topology. Before you reconfigure, see your system/network manager
for confirmation.

Port LED red

Problem Solving

Link Confidence Test
failure, possible cable
or cable connection
problem.

Check cable connections. Run the loop-

back test described in Section 5.6 to test
the port. See Table 54 for problem solving during loopback testing.

5-7

5.6

Loopback Testing
Use the loopback test to determine if the DECconcentrator 500 Port board or Network
Management board is faulty, or if the problem is with the cable or the device at the
other
end of the cable. This test verifies the basic ability to transmit and receive.
The loopback
test does not verify the ability to receive minimum level signals. The test
does not verify
that the transmitter’s output level is within specification. Use the following procedur
e:

Install the loopback connector (Figure 5-3).

Observe and record the port LED status on that port. The port status LED should

blink red.

Refer to Table 54 for corrective action.

—

If you have a port or board fault, see your system/network manager or authorize

representative for help. See also the DECconcentrator 500 Problem Solving

more information.

d service
guide for

Figure 5-3: Installing a Loopback Connector

Mgy

LKG—-4368—90A

5-8

'DECconcentrator 500 Installation

Table 5-4: Problem Solving During Loopback Testing

Symptom

Probable Cause

Corrective Action

|
a

Port LED red on,
green on, or blinking

Port failure.

The board needs to be replaced or repaired. See your system/network manag-

green

Port LED blinking red
a

The transmit power may
be out of specifications.

5.7 Down-Line Loading

—

Normalduringloopback Checkthe operationalstatus of the device

testing. Original prob- at the other end of the link. If the problem
lem may be with the persist, see your system/network managcable or device at the er or service representative for help.
other end of the cable.

|
-

er or service representative for help.

Down-line loading of software to upgrade firmware can be done through the Network
Device Upgrade utility or through DECelms and NCP.

5.7.1

Network Device Upgrade Utility

e
o
o

The Digital Network Device Upgrade (DECndu) utility lets you upgrade software from
either a VMS-based or ULTRIX-based host system. The DECndu is supplied with the
upgrade software. Before you upgrade the software using this utility, you need to be fa-

Physical address of the device to be upgraded

Type of controller available on the host node

Load file in the form: <DEVICE-NAME><SOF TWARE-VERSION> . XXX

miliar with the following:

NOTE

Make sure you follow the directions supplied with the
software upgrade kit. The utility prompts you for information. Each query must be answered.

b
—

5.7.2 DECelms and NCP Down-Line Loading

The sequence of DECelms and NCP commands cause the unit to send a request to the host

machine to start the process. The procedure loads the new code into packet memory on
the unit. While in packet memory, the image is verified. The unit then goes off line for 1 to

P
o

5 minutes while the operational code is erased and rewritten with the new code in packet
memory. The unit reboots and is operational with the new code.

o
75

If you choose to use NCP and DECelms to perform a down-line upgrade, make sure you
refer to your NCP and DECelms documentation for detailed directions.

Problem Solving

5-9

Aol

Wit

FrLT

o Wi

[

Configurations

_
A.1
L

Environments Served by FDDI PMD
The FDDI Physical Layer Medium Dependent (PMD) standard describes three major
application environments:
1.

Office/building — consists of a relatively large number of nodes (smaller computers, communications controllers, and workstations). The nodes may be frequently powered down. Supported by a radial (star) wiring scheme, this
environment can expenence frequent moves, add-ons, and changes.

Campus — consists of multiple bulldmgs with links of up to 2 kilometers (l 2

miles). The campus environment is a superset of the office/building environ-

ment.

floors.

|
-

Data Center — consists of a small number of nodes (typically mainframe computers) restricted to a limited geographical area. The data center, a subset of the
office/building environment, allows the use of casual wiring such as raised

A.2 Wiring

Commercial building wiring standards, such as EIA/TR 48.1 and EIA/TIA-568, address-

—
P
*

es all communication needs: voice, data, and video distribution for single or multiple
buildings. EIA/TR 41.8.1 and EIA/TIA-568 define awfing system that supports a multivendor, multiproduct environment. The core of the wiring system is a hlcrarchy of equipment rooms that provide crossconnects.

A.2.1 Crossconnect

Crossconnects allow cables terminated on “one side” to be connected with cables terminated on the other side by means of a patch cord. Crossconnects mean that:

A-1

Wiring subsystems can be linked together and circuits can be routed or rerouted

to various locations within the system.
®

Various logical topologies can be supported over the same physical network.

A.2.2 FDDI Wiring Subsystems
The FDDI wiring subsystems consist of the:
@

Campus backbone subsystem that goes from the main distribution frame (MDF)
to the intermediate distribution frame (IDF) in a building. There is only one
MDF. All buildings on a campus have an IDF (Figure A-1).

Building backbone subsystem that goes from the IDF to the horizontal distribution frame (HDF) on each floor. The building backbone subsystem is sometimes
referred to as the riser subsystem.
Horizontal wiring (distribution subsystem) that goes from the HDF to transition
points such as the satellite distribution frame (SDF) and then to the office wallbox, or directly from the HDF to the office wallbox.

A.2.3 Topology (Hierarchical Physical Star)
A hierarchical physical star topology provides a central point for administration, man-

agement, and remedial maintenance. A physical star topology allows flexibility for configuring any logical topology.

A.3 Configuring the DECconcentrator 500 in FDDI Networks
The DECconcentrator 500 wiring concentrator can be used:

As an FDDI backbone providing high-speed interconnection of FDDI and
802.3/Ethernet networks.
In a dedicated high-speed network for specialized environments, such as work-

group LANs connecting high-performance workstations and servers.
@

[

In a standalone high-speed workgroup.

The actual installation can be a standalone wiring concentrator with direct SAS worksta-

tion interconnections, concentrators installed on a dual ring, concentrators installed in a
ring of trees configuration, or as a backbone.
Digital recommends a dual ring of trees topology with the dual ring contained within the
MDF of the cable plant.

DECconcentrator 500 Installation

pch

Figure A-1: Equipment Rooms

| Main

Distribution

Frame (MDF)

—

(

(one per site

)

mmmwmmmmmmmmmmmmmm mmmmmmmmmmmmm “..

/—- Campus Backbone

Intermediate

Frame (IDF)

Distribution

(0"9 per building)

2000 m

(6560 ft)

7TTN ouomgsasoone
Building Backbone

500 m
(1640 ft)

Horizontal
Distribution
Frame (HDF)

Horizontal

Horizontal
Wiring

To Office Wallbox
*These are recommendations set forth in EIA/TIA 568 for structured wiring schemes.
LKG-3796-901

A.3.1

Land

Standalone Configurations

Figure A-2 shows the concentrator installed in a standalone workgroup. Figure A-3
shows a dedicated high-performance network with network management capabilities.

Configurations

A-3

Figure A-2: Standalone Workgroup Installation (No Network Management Present)

(SAS)

Work—

(SAS) ;

(SAS)

station

(SAS)

‘ (SAS)

CON = DECconcentrator 500
SAS = Single Attachment Station
LKG-3797--891

Figure A-3: Dedicated High-Performance Network Installation (Network
Management Present)

| Work—
| station

| Work— |

Work—

100 Mb/s
FDDI Ring

CON |

station

con ] Mini|

|§

| computer

et Wi

station |

File

Server

;

Main

Frame

LKG-4456-891

DECconcentrator 500 Installation

A.3.2 DECconcentrator 500 Installed in Tree Configurations
Figure A—4 and Figure A—5 show the wiring concentrator in tree configurations.

Figure A—4: Simple Tree Topology on a Dual Ring
Primary Ring
Secondary Ring

CON 1

SAS

CON 3

| SAS || SAS l
CON = DECconcentrator 500
SAS = Single Attachment Station
P = Token
Note:

CON 1 and CON 2 connected through ports A and B on the Network Management
hoard. CON 3 connected to CON 2 through a port on the Port board.
LKG-3808--001

Configurations

A-5

Figure A-5: Logical Star, Tree Topology, FDDI Campus Backbone
A

- Building 1

(HDF)

Building 2

(HDF)

|
Building 3

(HDF)

CON
(MDF)

|
Building 4

(HDF)
i

CON = DECconcentrator 500
HDF = Horizontal Distribution Frame
MDF = Main Distribution Frame
B
= Bridge
LKG-3808--901

A—6

DECconcentrator 500 Installation

e
|
e
|

A.3.3 DECconcentrator 500 Installed in Ring Configurations
Figure A—6 shows a wiring concentrator installed in a high-speed dedicated network supporting specialized, network-intensive applications. Figure A—7 shows an FDDI dedicated high-speed network for specialized environments such as a workgroup LAN
connecting high-performance workstations and servers. Figure A—8 shows a campus
configuration.

Figure A-6: DECconcentrator 500 Installed in High-Speed Dedicated
Network

Work—
7] station

Work—
station

Mini—
computer

100 Mb/s FDDI Ring

station

] Work- |

|
| station

Main
Frame

! Work— |
\

—

‘

File

Server

“Work
LKG-3812-801

Configurations

A-7

Figure A-7: DECconcentrator 500 Installed in a Logical Ring with Workgroup LANs Within a Building

802.3/Ethernet
10 Mb/s LAN

Bridge

802.3/Ethernet
10 Mb/s LAN

l Bridge I

802.3/Ethernet
10 Mb/s LAN

! Bridge |

Work--

Work—

statnon

| station

Work--—

Mini—

computer
Main

|
iy

CON

Worke

Server

Bridge
B

802.3/Ethernet
10 Mb/s LAN

LKG-3813-891

A-8

DECconcentrator 500 Installation

Figure A-8: DECconcentrator 500 Installed in a Campus
Building 1

Building 2

(HDF)

(HDF)
{B}—

1
Building 3

(MDF)

(HDF)

CON = DECconcentrator 500
HDF = Horizontal Distribution Frame

Building 4

(IDF)

IDF = Intermediate Distribution Frame
B = Bridge

MDF = Main Distribution Frame
LKG-3814-901

Configurations

A-9

Wit

A.4 FDDI Redundant Topologies
The FDDI connection rules allow for several redundant topologies. A redundant topology provides several logical paths from the trunk ring. This is useful when there is a node or

cable failure and the trunk ring goes into the wrap state. Redundant topologies can be used
in installations where system up-time is very critical.

Figure A-9 shows a simple redundant connection.

Figure A-9: DECconcentrator 500 Installed in Redundant Topologies

[‘I_"___"

::__I""'"""
PHYA

PHYB

PHY A

CON
PHYM

PHYM

—
Y

PHY B

CON
PHYM

PHYM

Primary

Connection
Back-Up

'PHYA

PHYB

CON

PHYM

l
1

Primary
Connection

PHY A

PHY B

CON

LKG-4373-90I

A-10

DECconcentrator 500 Installation

Option Board Installation

B.1 Option Board Installation

pon

You can use the following procedures to install any option board. Always observe antistatic precautions when you handle electronic equipment.
Option board installation includes the following steps:

Removing power and cables from the unit

Removing the blank handle or existing option board

Installing the new option board in the concentrator

Refer to the option board installation guide(s) for specific details for each board you install.

Always install a Network Management board in the top slot of the concentrator. If a Port
board is already installed in the top slot, reinstall it in another slot.

B—1

B.2 Removing Cables
To remove the cables, do the following:

Disconnect the power cord from the wall and then from the wiring concentrator

(Figure B-1).

Disconnect any fiber optic cable from the unit that prevents easy access to the
slot where the option board is to be installed. Make careful note of the cable orientation and port location for each cable you remove.

Figure B-1: Removing Cables

LKG-3979—-90A

B-2

DECconcentrator 500 Installation

B.2.1 Removing the Blank Handle or Installed Option Board
To remove the blank handle or installed option board, do the following:

1.
2.

Using a Phillips-head screwdriver, push in and turn the two captive screws coun-

terclockwise 1/4 turn.

Unlock the blank handle locking levers (Figure B-2). Remove the blank handle.

Figure B-2: Removing a Blank Handle or Installed Option Board

Unlocked
LKG—3802—-90A

Option Board installation

B-3

B.2.2 Installing an Option Board

If a Network Management board is to be installed, always install it in the top slot. Any
type of Port board can be installed in any option slot.To install an option board,
do the

”’"‘”“““

following:
1.

Carefully remove the option board from its anti-static bag. Make sure the locking levers on the option board are unlocked (Figure B-3).

Slide the option board into the selected slot. Push firmly in place.

Lock the board in place and turn the two captive screws clockwise 1/4 turn.

If you have a tabletop unit, go to Chapter 4, otherwise, go to Chapter 3, Section

3.4. Do not connect any cable until instructed to do so.

Figure B-3: Installing Option Boards

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g

W By

b
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FLX

1/4 Turn

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LKG-3803-90A

DECconcentrator 500 Installation

Multimode Optical System

C.1

Overview
The DECconcentrator 500 fiber optic system consists of a transmitter, optical cable,and a
receiver for each port on the Port board and on the Network Management board. FDDItype connectors or 2.5 mm ST-type connectors connect the cable to the transmitter and
receiver on the option boards. There are actually two such optical systems in a link to provide bidirectional transmission. The cable plant can have a number of connectors and
|
splices in it.
" 'The transmitter converts an electrical data signal into an optical pulse train and transmits
the light pulse into the core of the optical fiber in the cable. The cable guides the light to
the optical receiver at the other end. The optical receiver converts the light pulse into an
|
electrical data signal.

For the receiver to function correctly there must be sufficient optical power. Cables and
connectors cause incremental loss of optical signal. The primary measure of the
DECconcentrator S00 optical system is its optical loss. The end-to-end optical loss of the
optical channel must be controlled to ensure proper operation of the unit.

C.2 Option Board Optical System
The DECconcentrator 500 can span a distance up to 2 kilometers (1.2 miles) from stationto-station using the specified fiber optic cable. The Network Management board, Port
board, and Low Power Port board all use 1300 nanometer wavelength LED transmitters
and PIN photodiode receivers. When used with the design fiber, the link provides the user
with:
e

Network Management or Port board with 11 decibels (dB) of loss to achieve the

required transmission distance.

C-1

62.5 micron core fiber provides an 11 dB optical power budget

—

50 micron core fiber provides a 6 dB optical power budget

100 micron core fiber provides an 11 dB optical power budget

Low Power Port board with reduced optical power budget to achieve the re-

quired transmission distance.

62.5 micron core fiber provides an 7 dB optical power budget

—

50 micron core fiber provides a 3—5 dB optical power budget. The exact
power budget will vary depending on the 50 micron cable attributes. The
worst case is 3 dB.

C.2.1 Optical Loss
The optical loss in the optical channel is contributed by:
e

The optical loss of the cable itself.

The losses contributed by each connector and splice in the cable plant.
RS

Careful attention must be paid to the total optical loss of the cable plant when the devices
span long distances or when extensions to existing links are planned. The optical loss of
high-quality cables depends on the cable type, but can range from 0.5 to 1.5 dB/km.
Splice losses can vary from 0.2 to 0.5 dB each. Connector losses can range from 0.3 to 1.0
dB each. The total loss in the system must be less than the power budget.

NOTE
Use of 100 micron core fiber may result in higher power
launched into the fiber. Users employing 100 micron fiber should confirm that their cable has at least 3 dB of
attenuation.

C.2.1.1

Optical Cable Attenuation

The attenuation of optical cables varies with wavelength, therefore, it is important to

measure the optical loss of the cable at 1300 nanometers for all option boards. High-quality cables have lower optical loss per kilometer values than low-quality cables. Connector

losses are generally not wavelength-dependent.

Any cable plant should be similar with respect to fiber type. Mixing fiber types usually
results in very high losses and is not recommended.
AR

DECconcentrator 500 Installation

C.2.1.2

Cable Repair Strategy

The cable repair strategy also affects the optical loss budget. Although damaged cable
can be repaired, it is usually at the cost of additional losses due to the splices or connectors
that must be used to replace the damaged section. A good wiring strategy includes loss
budget explicitly set aside for future repairs.

C.2.2 Checking for Optical Loss

The optical loss of the optical channel can be checked at the receive end of the fiber by
measuring the optical power exiting the fiber. The transmitting station must be powered
up and transmitting an optical idle signal. Use the procedure and equipment specified in
the DECconnect System Fiber Optic Installation guide. It is advisable to check the optical
loss on both sides of a patch panel.

The DECconcentrator 500 option boards have a margin built-in to allow for gradual
transmitter and receiver degradation over the life of the product. However, the margin can
result in too much power for very short transmission lengths. Optical power exiting the
fiber in excess of —14 dBm is an indication that the cable plant does not have enough optical loss. The receiver will not function properly unless optical loss is introduced to limit
the optical power to —14 dBm or less.

Multimode Optical System

C-3

N
s

iRy

———

Specifications

D.1 Physical Specifications
—

Table D-1 through Table D-3 list the DECconcentrator 500 physical and power cord

specifications.

Table D-1: Rack Mount Unit Physical Specifications
Parameter

Dimension

Height

13.33cm

—

Depth
Width
Weight

29.85cm (11.75 in)
43.59cm (17.16 in)
7.95 kg (17.51bs)

Table D-2: Tabletop Unit Physical Specifications (Plastic Enclosure)

(5.25 in)

Parameter

Dimension

Height

16.10cm (6.34 in)

Depth

31.31 cm (12.33in)

Width

49.30cm (19.41 in)

Weight

997kg

—

Table D-3: Cable Specifications
Parameter
ac power cord length

(22 Ibs)

Dimension
US.A. 1.83m (6 ft)

Others 2.5m (8.2 ft)

D.1.1

Fiber Optic Connector and Cable Specifications
Digital recommends 62.5/125 Graded Index Multimode Optical Fiber. The fiber optic

cable should conform to Digital’s general specification 1710002—GS. Contact your sales
representative for information about ordering this specification. Table D—4 through
Table D6 list fiber optic connector and cable specifications. Note that the minimum

power budget requirements are included in these tables even though they are not specifications. The power budget is contingent on core and cladding tolerances.

Table D-4: Fiber Optic Connector Specifications
Connector Type

Attenuation

FDDI ANSI

Maximum attenuation not directly specified by ANSI X3T9

ST 2.5 mm (0.10 in)

Maximum attenuation less than 0.7 dB

Table D-5: Fiber Cable Specifications
Recommended Cable

Parameters

Core diameter

- 62.5um £ 3.0 um

Cladding diameter

125+ 2.0 ym

Nominal operating wavelength

1300 nm

Numerical aperture

0.275 + 0.015

Optical power attenuation

<1.5 dB per km at

Minimum bandwidth

500 MHzekm

‘Minimum power budget

11.0dB at 1300 nm

Maximum distance

2 km (1.2 miles)

1300 nm

Table D-6: Alternate Fiber Cable Specifications
Alternate Cable

100/140

Nominal core diameter

100 um £ 4.0 pum

50 pm + 3.0 um

Nominal cladding diameter

140 pm £ 6.0 um

125 um £ 2.0 um

Nominal operating wavelength

1300 nm

Nominal numerical aperture

0.29 + 0.015

0.20 £ 0.015

Minimum bandwidth

500 MHzekm

Minimum power budget

11 dB

6.0 dB

1.6 km (.96 miles)

2 km (1.2 miles)

Maximum distance

50/125

NOTE
Lengths less than 1 kilometer (3280 feet) of 100 micron
(um) fiber do not have sufficient optical loss; malfunc-

tion of the receiver can occur. Use 62.5/125 patch cords
to induce loss.

D-2

DECconcentrator 500 installation

D.1.2 Environmental Specifications
The DECconcentrator 500 is designed to operate in an open office or in an exposed area of
an industrial site. The concentrator is not designed to operate in an air plenum.
NOTE
To prevent damage to electronic components, do not exceed 50°C (122°F) ambient temperature at the air intake
of the DECconcentrator 500.

Table D-7 and Table D38 list the environmental specifications.

Table D-7:

Operating Environment Specifications

Parameter

Value

Operational temperature

5°C (41°F) to 50°C (122°F) at sea level *

Non-operational
temperature

—40°C (—40°F) to 66°C (151°F)
|

Relative humidity

10% or less to 95% (noncondensing)

Wet bulb

32°C (90°F) maximum

Dew point

2°C (36°F) minimum

Altitude

Sea level to 2.4 km (8,000 ft)

Air flow

200 LFM (minimum), for adequate air flow, provide about 10to 15
cm (4 to 6 in) of space at both ends

inlet/outiet air tempera-

Intlet: 50°C (122°F) maximum

ture

Outlet: 60°C (140°F) maximum

*Reduce the maximum operating ambient temperature by 1.8°C/100 m (1° F/1000 ft) for operation at high
altitude sites.

Table D-8:

Shipping Environment

Parameter

Value

Temperature

—40°C (—40°F) to 66° C (151°F)

Relative humidity

10% or less to 95% (noncondensing)

Altitude

Sea level to 9.1 km (30,000 ft)

NOTE
Your service contract may require more specific limits
for temperature and humidity.

Specifications

D-3

D.1.3 Electrical Specifications
The DECconcentrator 500 power supply has power cord options for all major Digital
-markets. Table D-9 lists the DECconcentrator 500 electrical specifications for a fully

configured concentrator. Section D.1.4 lists the power supply specifications.

Table D-9: Electrical Specifications
Parameter

120 Vac Operation

240 Vac Operation

Nominal line voltage

110V

220V

Voltage tolerance

88 Vac to 132 Vac

176 Vac to 264 Vac

Power source phasing

Single

Frequency

50/ 60 Hz

50/60 Hz

Line frequency tolerance

47 Hz to 63 Hz

47 Hzt0o 63 Hz

Input current (maximum)

2.3ARMS at88 VRMS line

1.2 ARMS at 176 VRMS line

Input current (typical)

1.6 ARMS at 88 VRMS line

0.92 ARMS at

Input power (maximum)

120 W
(input VA 200 maximum)

Input power (typical)

105 W
(input VA 155)

105 W
(input VA 177)

Over voltage condition

176 VRMS line

150 VRMS for 1 second maxi-

300 VRMS for 1 second maxi-

mum

Cold start inrush current

Low range: 35 A peak
High range: 35 A peak

Heat dissipation (maximum)

120W

120 W

Heat dissipation (typical)

105 W

Circuit breaker rating

D.1.4 Power Supply Specifications

The 154 watt universal power supply has the following specifications:

+50Vdcat18 A and 5.0 Vdc at 10 A

+120Vdcat 2A

Overvoltage protection

Thermal shutdown

Auto adjust for input voltage to 120 Vac operation and 240 Vac operation

DECconcentrator 500 Installation

Service Options

E.1

Digital Service
The Digital Service program provides a wide range of maintenance plans. These include
on-site, carry-in, and mail-in maintenance services.

E.1.1

On-Site Repair

Digital offers fast, low-cost, quality maintenance performed at your site by
Digital-trained Service Specialists. There are several on-site services available.
E.1.1.1

DECservice Customer Support

DECservice customer support provides preferred on-site service, with a guaranteed response time when equipment is located within a specified distance from the service facility. DECservice guarantees a continuous repair effort until service is restored. You can
choose the hours of coverage, as much as 24 hours a day, 7 days a week.
E.1.1.2

BASIC Customer Support

BASIC customer support service provides on-site service during regular business hours,
Monday through Friday.

E.1.1.3

On-Site Service Center

If you have at least 50 terminals or small systems and can provide work space at your site,
Digital will provide an on-site technician for a predetermined, period of time.This repair
service is provided for a variety of models.

E-1

E.1.1.4

Per Call Service

This noncontractual service provides on-site repair based on time and materials. Per Call

service is available during regular business hours, Monday through Friday.

E.1.1.5

DECall Service Program

DECaall service program is similar to Per Call service. You pay a fixed fee per call with an

annual retainer fee.

E.1.2 Off-Site Service
Digital also provides several options for off-site service. Contact your local Digital Field
Service office for information.

E.2 How to Get Service
Digital has a central SERVICenter in your area to help you keep your system running at
peak efficiency. To find out more about Digital hardware and software service offerings,
call one of the following telephone numbers.

In the United States: 1-800-554-3333

Worldwide: Contact your local Digital Field Service office.

E-2

DECconcentrator 500 installation

DECconcentrator 500 Identification List
Fill in the DECconcentrator 500 Identification List and give a copy to the system/network

00UooG

manager.

DECconcentrator 500 model number
DECconcentrator 500 serial number
Network Management board: network address

Network Management board: switch 1 setting
Network Management board: switch 2 setting
Network Management board: ports used
Port A cable i.d. number

Port B cable i.d. number
First port module: number of ports used
Port 1 cable i.d. number
Port 2 cable i.d. number

Port 3 cable i.d. number

Port 4 cable i.d. number

Second port module: number of ports used
Port 1 cable i.d. number
Port 2 cable i.d. number

Port 3 cable i.d. number
Port 4 cable i.d. number

Third port module: number of ports used
Port 1 cable i.d. number

Port 2 cable i.d. number
Port 3 cable i.d. number
Port 4 cable i.d. number

F-1

SO,

AN,

SRR

ARG

WSS

G
Related Documents

Additional information can be found in the following documents. Ordering information
is provided at the back of this guide.
DECconcentrator 500 Option Board Installation (Order No.-EK-DEFCN-OP)
This guide describes the procedures to install additional or replacement option
boards in the DECconcentrator 500.

DECconcentrator 500 Problem Solving (Order No. EK-DEFCN-PS)

This guide describes isolating DECconcentrator 500 faults to the field-replaceable unit (FRU) and removing and replacing each FRU. This is a field problemsolving guide.

FDDI System Level Description (Order No. EK-DFSLD-SD)
This guide describes the FDDI system, how it works, and the role of the individual components.

DECbridge 500 Installation (Order No. EK-DEFEB-IN)
This guide describes installation procedures for the DECbridge 500.
DECbridge 500 Problem Solving (Order No. EK-DEFEB-PS)
This guide describes isolating DECbridge 500 faults to the field-replaceable unit
(FRU) and removing and replacing each FRU. This is a field problem-solving
guide.

DECconnect System Fiber Optic Planning and Configuration (Order No.
EK-DECSY-FP)
This guide describes the planning requirements, product information, and guidelines for configuring DECconnect System Fiber Optic Networks that use the
DECconnect System fiber optic products.

DECconnect System Fiber Optic Installation (Order No. EK-DECSY-FI)

This guide describes how to install a DECconnect System fiber optic cable

plant.

DECelms Installation (AA-PAK1A-TE)

This guide describes how to install and verify DECelms (DEC Extended LAN
Management Software) on a VMS system.

DECelms Reference (AA-PBWBA-TE)

This manual is a reference guide to the DECelms (DEC Extended LAN Management Software) commands.
DECelms Use (AA-PAK2A-TE)
i

This guide describes how to use DECelms (DEC Extended LAN Management

Software) to configure, manage, and monitor the LAN Bridge 100, LAN Bridge
150, LAN Bridge 200, DECbridge 500, and DECconcentrator 500.

Additional Networking Documentation
Additional information about networking products can be found in the following documents. Ordering information is provided at the back of this guide.
Networks and Communications Product Documentation (Order No.
EK-NACPD-RE)

This guide lists the title and order number for each publication associated with
Digital Equipment Corporation’s Networks and Communications products.

Telecommunications and Network Buyer’s Guide. Customers can receive a cata-

log by contacting their local sales office.

This catalog contains a complete list of the available networking products.

G-2

DECconcentrator 500 Installation

Glossary

attenuation
Level of optical power loss expressed in units of decibels (dB).
average power

Optical power measured using an average reading power meter when the
transmitting a stream of halt (00100) symbols.

FDDI station is

bypass
The ability of a station to be optically isolated from the network while maintaining the
integrity of the ring.

claim token process
A process to determine the timed token rotation time (TTRT), initiate the token, and initialize the ring. The station with thelowest TTRT or address initializes the ring if the T-bid
is the same.

concentrator (CON)
An FDDI node that provides additional attachment points for stations that are not part of
the dual ring, or for other concentrators in a tree structure. A concentrator has two Physical Layer entities and may have one or more Data Link Layer entities. The concentrator is
the focal point of Digital’s dual ring of trees topology.

configuration switch
On the wiring concentrator, one of two hardware switches located on the network management board handle. Switch 1 is used to reset the system parameters to the default status, switch 2 is used to enable/disable remote write access.

A software switch residing in firmware that gives the station management component the
ability to switch out a group of PHY's that are contained on a module. The connection
management component provides signaling-based services to the token ring stations.

Glossary—1

connector plug
A device used to terminate an optical conductor cable.

connector receptacle
The fixed or stationary half of a connection that is mounted on a panel/bulkhead. Recep-

tacles mate with plugs.

counter-rotating ring
An arrangement whereby two signal paths, whose direction is opposite to each other, exist
in a ring topology.

Data Link Layer (DLL)
An FDDI protocol sublayer that provides for Media Access Control (MAC) and Logical

Link Control (LLC).

Dual Attachment Concentrator (DAC)
A concentrator that offers two connections to the FDDI network capable of accommodating the FDDI dual (counter-rotating) ring.

Dual Attachment Station (DAS)
An FDDI device that offers two connections to the FDDI network capable of accommo-

dating the FDDI dual (counter-rotating) ring.

fatal fault
A condition that causes a specific LED display on the wiring concentrator or

amessage on

a remote management system and stops operation of the wiring concentrator or compo-

nent until you find and correct the problem.

Fiber Distributed Data Interface (FDDI)

A set of ANSI/ISO standards that, when taken together, define a 100 Mby/s, timed-token

protocol. Local area network that uses fiber optic cable as the transmission medium. The

standards define physical layer medium dependent (PMD), physical layer protocol
(PHY), media access control (MAC), and station management (SMT) entities.

FDDI connector
A category of connectors that meet the ANSI PMD standard and are used to connect

single attachment stations, dual attachments stations, and wiring concentrators to an
FDDI network. Type A and B connectors are used to connect a wiring concentrator or
dual attachment station to the dual ring. Type M and S connectors are used to connect wiring concentrators and single attachment stations.

FDDI network

A fiber optic network that meets the ANSI X3T9 standard. A dual rotating token ring network operating at a bandwidth of 100 Mby/s.

Glossary-2

fiber
Dielectric that guides light; waveguide.

fiber optic cable
A jacketed fiber or fibers.

fiber optics
A technology whereby signals are transmitted over an optical waveguide medium

through the use of light-generating transmitters and light-detecting receivers.

LASER
Light Amplification by Simulated Emission of Radiation. Used for transmission over
single-mode cable systems.

logical ring
An FDDI network comprised of all the connected MACs, viewed from the perspective of
the topology of the connected MAC:s. In contrast to a physical ring, which views an FDDI
network from the perspective of the topology of all physically connected nodes.

Maintenance Operation Protocol (MOP)

A formal set of networking rules and messages used to load and dump computer memory.

MOP is also used to test a communications link between two adjacent network nodes.

Media Access Control (MAC)
A component of FDDI that:
—

Provides for timed token access to stations on the ring

—

Allows communication through frames

—

Initializes the ring and controls the claim process

—

Controls the beacon process and locates the fault when the ring is broken.

Network Management board

An option board for the wiring concentrator that provides for the connection to the dual

ring and the hardware/firmware to allow remote management and up-line dump and

down-line upgrade. A network management board has two FDDI connectors: one type A
and one type B.

node

A generic term applying to any FDDI network attachment (station, concentrator, or re-

peater).

null port
An internal port on the wiring concentrator network management board that provides a

mechanism for bypassing the concentrator’s MAC function.

Glossary—-3

optical receiver
An optoelectronic circuit that converts an incoming optical signal to an electronic logic
signal.

optical transmitter
An optoelectronic circuit that converts an outgoing electronic logic signal to an optical

signal.

parity

|
A method of checking for the correct data that involves counting the 1 bits in each character’s data pattern, and then making the sum either even or odd.

physical connection

The full-duplex physical layer association between adjacent PHYsin an FDDI ring; a pair

of Physical Links.

physical link
The path, through PMD and attached cabling, from the transmit logic of one PHY to the
receive logic of an adjacent PHY in an FDDI ring.

Physical Media Dependent (PMD)
A media-dependent FDDI protocol layer that provides for the fiber, connector, and opti-

cal pulse requirements.

Physical Media Independent (PHY)
A sublayer of FDDI that provides for coding, clock rate differences, and symbols. The
PHY is the connection between the PMD layer and the Data Link Layer.

PIN
P-type I intrinsic N-type (semiconductor). A type of photodiode used as a detector to
make sure received and transmitted light can convert to electrical signals.

Port board
An option board for the wiring concentrator that provides for the connection of up to four

single attachment stations to the wiring concentrator. A Port board conforms to the ANSI
X3T9 standard and supports 1300 nanometer wavelength fiber optics and has four FDDI
type M fiber optic connectors.
A Low Power Port board does not conform to the ANSI X3T9 standard. However, the
Low Power Port board is designed to operate with FDDI devices and supports 1300 nano-

meter wavelength fiber optics and has eight 2.5 mm ST-type fiber optic connectors for
connection of up to four devices
processor

The functional part of the wiring concentrator Controller/Backplane that uses instruc-

tions to perform computation or manipulate data.

Glossary—4

MmO

receive

The act of a station accepting a frame, token, or control sequence from the ring.
repeat

The act of a station in receiving a code-bit stream (frame or token) from an upstream station and placing it onto the ring to its downstream neighbor. The repeating station may
examine, copy to a buffer, or modify control bits in the code-bit stream before placing the
data onto the ring.
repeater

An FDDI node that minimally comprises the functionality of two PMDs and provides
only a repeat function. A repeater does not have any MACs or concentrator functionality.
For example, a DECconcentrator 500 configured with port boards only and installed in a
standalone configuration acts like a repeater.

ring
Two or more stations wherein information is passed sequentially between active stations,

each station in turn examining or copying the information, finally returning it to the originating station.

Single Attachment Concentrator (SAC)
A concentrator that offers one attachment to the FDDI network.

Single Attachment Station (SAS)
An FDDI station that offers one attachment to the FDDI network.

station
An addressable node on an FDDI ring capable of transmitting, repeating, and receiving
data. A station has exactly one SMT and at least one MAC, one PHY, and one PMD.

token
A special frame that is transmitted around a ring. Whichever node has the token has the
right to transmit data over the ring. Each node has a timer that controls how long the node

can hold the token.

transmit
The act of a station that consists of generating a frame, token, or control sequence, and
placing it on the ring for receipt by the next (downstream) station.

trunk ring
The dual ring used for FDDI.

Glossary-5

o @t

Aot

Sgeseoniipy:

SIS

[

s R

IndeXx
A

connectors

colored, 2-8
A-type port

connection guidelines, 1-8
labeling, 1-8
Address

destination, 1-9
unique hardware, 1-9
All LED:s off, 5-6

keyed, 2-8

identification number, 4-9
maximum lengths, table, 2—8
optical loss, value, C-2

repair strategy, C-3

Cable connection, problem with, 5-7

Cable plant

Altitude, D-3

corrected loss, 2-5

ANSI standard, 1-1

log book, 2-5

Attenuation, C-2
Auto voltage select, 1-9

sample log entry, 2-5

Card cage
description, 1-5
distribution of option boards, 1-5
Network Management board location, 1-5

B-type port

connection guidelines, 1-8
labeling, 1-8

Backplane

function, 1-6
number of connectors, 1-6

size of connectors, 1-6

Port board location, 1-5

Caution
fiber optic cable bend radius, 4-7

field replaceable units, 5-2

plastic cover screws, 3—7
power cord, 4-2

static electricity, 2-1, 3-1
temperature, 3—6

Bandwidth, 1-1

Certification, cable installation, 2—-5

Board fault LED on, 5-7

Circuit breaker
amps, 1-10

function, 1-10

operation, 1-10
problem with, 5-6

Cable. See also Fiber optic cable; Power cord;
Certification

resetting, 5—6

wall outlet, 5-6

index—1

Clock recovery, 1-8

CPU. See Controller/backplane

Clock signal, 1-6

Crossconnect

Computer room, 1-2

intermediate, A-2

Configuration

main, A-2

cable length

between stations, 2—-7
concentrator to device, table, 2—8

maximum on network, 2—7

campus backbone, A-6

Damaged parts, 2-1

dedicated network, A-7

Data Link Layer, 1-1

dual ring, A-5

Data Link Layer hardware

high-performance network, A—4

address ROM, 1-9

logical star, A—6

MAC function, 1-9

number of stations, 2—7

packet memory, 1-9

reconfigure cable runs, 28

bypassing, 1-7

standalone, A-3

parity, 1-7

working group LANs, A-8

ring scrubbing, 1-7

Configure, adding cable runs, 2-8

through

backplane, 1-7

examples, 4-7

option board, 1-7, 1-8, 1-9

fault detection, 1-7

token ring, 1-7

FDDI PMD, 2-8

DC OK LED off, 5-6

keyed, 1-9, 2-8

DECconcentrator 500

optical loss, C-2

connecting to

optical loss, value, C-2

bridge, 2-5, 4-7

Connector type

dual attachment station, 4-8

Network Management board, 1-9
Port board, 1-7

dual ring, guidelines, 48
network, 4-1

active logic, 1-7

single attachment station, 47

connectors, 1-6

physical location, 2-6

firmware upgrade, 1-7, 5-9

position in rack, 3-6, 3—-10

function, 1-6

rack mount version, 2—6

table top version, 2-6

parity, 1-7

use in FDDI network, A-2

problem with, 5-6

voltage select, 4-2

RAM, 1-7

Distribution subsystem, A-2

ring scrubbing, 1-7

Down-line load

ROM, 1-7

description, 5-9

token ring maintenance, 1-7

EEPROM, 1-7

Controls and Indicators

new software, 5-9

circuit breaker, amps at trip, 1-10
LEDs, 1-11

process, 5-9

DRAM, 1-7

reset to default switch, 1-10

Dual ring, topology, 1-2

write access enable switch, 1-10

Dual ring of trees, guideline, 1-8

Index—2

end station, 25

Controller/backplane

LED, 1-9,5-6

Data path

rules, 2-7

Connector

plenum, 2-8

terminator, 2-8
EEPROM

Controller/backplane, 1-7

wavelength, 2—8
Field-replaceable unit

error log, 1-7

caution, 5-2

function, 1-7

isolation to, 5-2

Environment

list of, 52

altitude, 2-6, D-3
FDDI, A-1

maintenance strategy, 5-2

Firmware. See also Down-line load

humidity, 2-6, D-3

enable/disable write access, 1-8

power, 2—6

error log, 1-7

temperature, 2-6, D-3

upgrade, 1-7

ventilation, 2-6

description, 5-9

Error log, 1-12

new software, note, 5-9
process, 5-9
Frequency, D4
FRU. See Field-replaceable unit, 5-2

Fuse, 5-6

Fan LED, 1-9, 5-6
FDDI. See Fiber Distributed Data Interface
FDDI wiring subsystem
campus, A-2
distribution subsystem, A—2

G
Getting service, E-2

intermediate cross connect, A—2
main cross connect, A—2
riser subsystem, A-2
Fiber Distributed Data Interface
ANSI standard, 1-1

H
Hardware address

bandwidth, 1-1

function, 1-8

connectors, 4-6, 4-7
description, 1-1
- network size, 1-1
Fiber optic cable

bend radius, 4-7

location, 1-8

Horizontal wiring, A—2
Humidity, D-3
Hz
120 Vac operation, D4

cable caps, 47

240 Vac operation, D4

connecting

microprocessor, 1-7

2.5 mm ST-Type connector, 4-7, 4-8

bridge, 4-7
dual attachment station, 48
dual ring, 4-8
keyed FDDI connectors, 4-7, 4-8
guidelines, 4-7

procedure, 47
recommended type

compliance, 2—8

Digital standard, 2-8

Identification, cable

certification, 2—-5
id number, 2-5

Indicator. See Light emitting diode
Initialization, during self-test, 5—4

general purpose, 2-8

Index—3

Input current

Locking levers, B-3

120 Vac operation, 2-6, D-4

Logical link control, 1-1

240 Vac operation, 2-6, D4

Loopback test

Installation. See also Network Management

loopback installation, 44

board; Port board

normal display, 4-5

blank handle removal, B-3

procedure, 44, 5-8

bridge, 2-5

reading, 5-8

end station, 2-5
FDDI device in network, 2-5

when to run, 44, 5-7, 5-8

Low Power Port board

loopback connector, 44

ANSI specifications, 1-7

Network Management board

connector type, 1-7

guideline, 1-5, 3-2, B4

identification, 3—2

procedure, B—4

optical loss, C—2

office
air flow, 27
magnetic devices, 27

plastic cover, removal, 3-7
Port board

M-type connector, Port board, 1-7

guideline, 1-5, 3-2, B4

MAC. See Media access control, 1-8

procedure, B—4

Media Access Control

rack mount

bypassing, 1-9

process, 3—6

frame generation, 1-1

rack mount brackets, 3—8

function, 1-1

standard cabinet, 2—7
satellite equipment room, 2—7

packet memory access, 1-9
Memory controller, 1-9

Microprocessor, 1-7
- Missing parts, 21

L
LED. See Light emitting diode
Light emitting diode
at power up, 4-3

at connection of cables, 4-9, 4-10
function, 1-4 - 1-9
normal state, 1-11

Network management board, switches, location,

1-8
connection

power supply, 1-9

dual ring, 1-8

problem solving

dual ring of trees, 1-8

all off, 5-6

rules, 4-6

DCOK off, 5-6

connector type, 46

Port board fault led, 5-7

Data Link Layer hardware, 1-9

port LED blinking green, 57

data path, 1-9

port LED blinking red, 5-7

fault isolation, 1-9

port LED off, 5-7

handle, description, 1-8

ring operational LED, 5-7

identification, 3-2

ring operation status, 1-8
Line voltage, D4

Index—4

Network Management board

f T—

installation, B—1
LEDs, 1-8

location in card cage, 1-5, 3-2, B4

control, C-2

loopback test

optical loss, C-1, C-3

board fault LED, 5-9

option boards, C-1

port fault LED, 5-9

Optical pulse train, 1-1, C-1

media access control, 1-9

Option board

optical loss, C-1

data path through, 1-7

packet memory, 1-7, 1-9

location in card cage, 1-5

parity, 1-9
physical layer hardware, 1-9

number of stations, 1-6

Order number

port labeling and types, 1-8

identification list, 2—1

problem with ring operation, 5-7

location on unit, 2—4

processor control, 1-8

switch, function, 1-8
switch setting
procedure, 3—4

reset software parameters, 3—4

Packaging materials, 2—1

write enable, 34

Packet memory

Nonfatal fault
initialization, 5—4

operational software, 5—4
Null port

function, 1-9
Network Management board, 1-8

Number of stations

different configurations, 1-6
Network Management board, 1-6
Port board, 1-6

function, 1-9
location, 1-7, 1-9

motherboard support, 1-7

parity, 1-9
protection, 1-9
Patch cord, A-1

PHY. See Physical Media Independent, 1-1
Physical description, wiring concentrator, 1-4

Physical layer, 1-1
Physical Media Dependent

application environment, A—1

function, 1-1

optical pulse, 1-1
port type, 1-7

On-site repair, E-1

Operational software
nonfatal fault, 54

Physical Media Independent

coding, 1-1
function, 1-1

on-line diagnostics, 1-12

Physical star, topology, 1-2

ring fault handling, 1-12

Plastic cover

ring management, 1-12

caution, 3—7

self-test, 1-12

removal, 3-7

station management, 1-12
Operational status
at power up, 4-3

fiber optic connection, 4-9, 4-10

loopback test, 44, 4-5

PMD. See Physical Media Dependent, 1-7

Port board

ANSI X3T9 compliant, 1-7

bypassing, 1-8
clock recovery, 1-8

Optic system,

connection rules, 4-6

Optical loss, C-1

connectors, 1-7, 4-6

checking for, C-3

data, encoding/decoding, 1-8

Index-5

failures, 1-8

microprocessor, 68000, 1-7

function, 1-8

speed, 1-7

identification, 1-7, 3—-2
installation, B-1
location in card cage, 1-5, 3-2, B—4
loopback test, 5-9

low power optics, 1-7

Rack mount, 3-6 -, 3-10

optical loss, C-1

RAM, Controller/backplane, 1-7

problem with

Receive, data path. See Data path

board, 5-7

Receiver, C-1

cable connection, 5-7

Refresh timer, 1-7

connection, cable, 5-7

Remote management

port, 5-7

enable/disable write access, 1-8

ring topology, 5—7

MOP, 1-12

processor control, 1-7

resetting control parameters, 1-8

blinking, 5-7, 5-9

Repair, E-1

off, 5-7

Reset to default

red, 5-7, 5-9

switch function, 1-10

Power cord

switch operation, 1-10

Ring fault handling, 1-12

caution, 4-2

Ring management, 1-12

procedure, 4-2

Ring of trees, topology, 1-2

problem with, 5-6

Ring operation status, 1-8

unpacking, 21

Ring scrubbing, 1-7

warning, 3—1

Ring topology, problem with, 5-7

Power supply

auto voltage select, 1-9, D4

ARy

operational software, 1-12

Port LED

connecting

ARG

Riser subsystem, A-2
ROM, Controller/backplane, 1-7

function, 1-9

LEDs, 1-9

problem with, 5-6
Problem solving. See also Self-test

boards, 5-7

S
Self-test

by symptom, 5-6, 5-7

broken port, Port board, 1-8

circuit breaker, 56

function, 1-6, 54

procedure, 5-1

LED:s, table, 1-11

receive power, 5-9

procedure, 54

record, 5-1

symptom of a problem, 54

ring operational LED, 5-7

time to complete, 4-3

sequence, 52

Serial number, 2-1, 24

transmit power, 5-9

Service

who to notify, 5-1

Processor
access to packet memory, 1-9

control signal, 1-6
Controller/backplane, 1-7

Index—6

contract, 2-6, 5-1

how to get, 2-6, E-2

telephone number, E-2
types of, 5-1, E~1

Software. See Operational software, 1-12

P—

Specifications

Transmitter

function, C-1

cable, table, D-1, D-2
electrical, table, D4
environmental, D-3

type, C-1
wavelength, C-1

physical, table, D-1

Splice optical loss, C-2
Static electricity, 3—1
Switch setting

procedure, 3—4

reset software parameters, 3—4
write enable, 34
System diagnostic. See Self-test
System parameters, storing, 17

\'
Voltage switch, 4-2

W
Warning
fiber optic equipment, 44
hot unit, 5-2

power cord, 3—1, 4-2
Temperature, 3-6, D-3
Thermal protection, 1-9
Token ring, 1-7, 1-8
Topology

backbone, A-2

dual ring, 1-2, 1-3, A-2
physical star, 1-2, 1-3, A-2
ring of trees, 1-2, 1-4, A-2
tree configuration

Transmit data path. See Data path
Transmit power, problem solving, 5-9

Warranty, 5-1
Wiring

circuit rerouting, A-2
commercial, A-1
FDDI subsystem, A—2
multi-vendor environment, A-1
standard, A-1

Write access enable switch
default setting, 1-10
functions, 1-10

Index—7

AR,

SR,

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c/o Digital’s local subsidiary

Internal orders should be placed through Publishing and Circulation Services (P&CS),
Digital Equipment Corporation, 10 Forbes Road, Northboro, Massachusetts 01532-2597

o—
Lo

A&SG Business Manager

or approved distributor

*Any prepaid order from Puerto Rico must be placed
with the Local Digital Subsidiary:

809-754-7575

OIS

DECconcentrator 500
Installation
EK-DEFCN-IN-002

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