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Document:	DECconcentrator 500 Single-Mode Option Card Installation
Order Number:	EK-DEFCN-SM
Revision:	002
Pages:	61
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DECconcentrator 500

Single-Mode Option Card Installation

Order Number: EK–DEFCN–SM–xxx

CAUTION
People installing the cabling system described in this manual should know 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.

CAUTION
This equipment is in the 1st Class category (information equipment to be used in
commercial and/or industrial areas) and conforms to the standards set by the Voluntary
Control Council For Interference by Data Processing Equipment and Electronic Office
Machines aimed at preventing radio interference in commercial and/or industrial
areas. Consequently, when used in a residential area or in an adjacent area thereto,
radio interference may be caused in radios and TV receivers etc. Read the instructions
for correct handling.

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.

NOTICE – Class 1 Laser Device:
The lasers in this equipment are Class 1 devices, compliant with CDRH Rules 21, CFR
Subchapter J, Part 1040.10, at date of manufacture. Class 1 laser devices are not
considered to be hazardous.

DECconcentrator 500

Single-Mode Option Card Installation

December 1991
This manual describes how to install and check the
DECconcentrator 500 single-mode option cards.
Supersession/Update Information:

Order Number: EK–DEFCN–SM-xxx

This is a revised
manual.

EK–DEFCN–SM–xxx
November 1991

The information in this document is subject to change without notice and should not be construed as a
commitment by Digital Equipment Corporation. Digital Equipment Corporation assumes no responsibility for any errors that may appear in this document.
Copyright  1991 by Digital Equipment Corporation
All Rights Reserved.
Printed in U.S.A.
The following are trademarks of Digital Equipment Corporation:
DEC
DECbridge
DECconcentrator

DECconnect
DECdirect
DECelms
DECmcc

AMP is a registered trademark of Amphenol Corporation.
AT&T is a registered trademark of American Telephone and Telegraph.
IBM is a registered trademark of International Business Machines Incorporated.

This manual was produced by Telecommunications and Networks Publications.

Contents
Safety
Preface

iii

Safety

Warnings and cautions that appear in this manual are defined as follows:
WARNING

Contains information to prevent personal injury.

CAUTION

Contains information to prevent damage to equipment.

VORSICHT

Enthält Informationen, die beachtet werden müssen, um
den Benutzer vor Schaden zu bewahren.

ACHTUNG

Enthält Informationen, die beachtet werden müssen, um
die Geräte vor Schaden zu bewahren.

DANGER

Signale les informations destinées à prévenir les accidents
corporels.

ATTENTION

Signale les informations destinées à prévenir la détérioration
du matériel.

AVISO

Contiene información para evitar daños personales.

PRECAUCION

Contieneinformación para evitar daños al equipo.

vii

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

CAUTION

Use a pointed tool to change switch settings. Never use a
pencil; graphite can damage switches. (Page 1-3)

ACHTUNG

Verwenden Sie einen spitzen Gegenstand, z.B. einen Kugelschreiber, wenn Sie Schaltereinstellungen ändern wollen. Benutzen Sie dazu keinen Bleistift, da der Graphitabrieb die Schalter beschädigen kann.

ATTENTION

Utilisez un outil pointu pour changer le positionnement
des commutateurs. N’utilisez jamais un crayon, car le
graphite de la mine pourrait endommager les commutateurs.

PRECAUCION

Con cualquier herramienta puntiaguda se cambian los
parámetrosde conexión, pero nunca con lápices porque el
grafico daña los interruptores.

WARNING

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 connected to a light
source. (Page 1-5)

VORSICHT

Schauen Sie niemals direkt in ein Glasfaserkabel oder
einen Glasfaseranschluß. Die Laserstrahlen in faser-optischen Geräten können Augenverletzungen verursachen.

DANGER

Certains équipements utilisant les fibres optiques peuvent
émettredes rayonne-ment laser dangereux pour les yeux.
Ne vous avisez jamais de regarder par l’extrémité d’une
fibre optique ou dans l’ouverture d’un connecteur. Considérez toujours que le câble est relié à une source lumineuse.

AVISO

Algunos equipos de fibra óptica pueden emitir luzláser
que daña los ojos. No sedebe mirar en una puerta de
conector o fibra óptica. Siempre se debe suponer que el
cable está conectado a la luz.

viii

CAUTION

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 option cards from their antistatic bags until instructed to do so in the installation procedure. (Page 2-1)

ACHTUNG

Module und elektronische Komponenten können durch
elektrostatische Entladungen beschädigt werden. Benutzen
Sie immer eine antistatische Gelenkmanschette und eine
geerdete Arbeitsunterlage, wenn Sie am offenenGerät
arbeiten. Ein Antistatik-Kit ist in der BRD bei DECdirekt
unterder Bestellnummer 29-26246 erhältlich. Entfernen Sie
die antistatische Verpackunerst vonErweiterungskarten,
wenn Sie in der Installationsanleitung entsprechende Anweisungen sehen.

ATTENTION

Les charges excessives d’électricité statique peuvent endommager les modules et les composants électroniques.
Digital conseille l’utilisation d’un bracelet de masse et
d’un plan de travail mis à la terre (Réf. 29-11762) lors de
la manipulation des modules et des composants internes.
Si vous possédez des cartes en option, ne les retirez pas
de leur housse antistatique avant d’en avoir reçu l’instruction.

PRECAUCION

La electricidad estática puede dañar los componentes
electrónicosy los módulos. Digital recomienda que se utilicen cintas de pasadores y superficies detrabajo conectadas a tierra (Digital P/N 29-11762) al trabajar con cualquiermódulo o parte interna. No sacar de la bolsa ninguna placa de opciones adicional que pu diera tenerse hasta que se indique en el procedimiento de instalación.

WARNING

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 these procedures.
Do not apply power to the unit unless all covers are installed. (Page 3-1)

VORSICHT

SchließenSie das Netzkabel oder andere Kabel erst an,
wenn Sie dazuqaufge fordert werden. Andernfalls besteht LEBENSGEFAHR! Überdies können die Geräte Schaden nehmen.
Schließen Sie das Gerät erst an das Stromnetz an, wenn
alle Ab deckungen ord nungsgemäß angebracht worden
sind.

DANGER

Afin d’éviter tout risque d’accident corporel ou matériel,
NEBRANCHEZAUCUN cordon d’alimentation ou autre
câble sans en avoir reçu l’instruction explicite dans l
procédure.
Ne reliez au secteur qu’après l’installation complète de tous
les capots.

AVISO

Para evitar daños internos al equipo, NO conectar el
cable dealimentación ni ningún otro hasta que se indique
en estos procedimientos.

WARNING

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
oulet. (Page 3-1)

VORSICHT

Netzspannung ist lebensgefährlich. Beachten Sie dies,
wenn Sie das Netzkabel anschließen. In einigen Ländern
dürfen Elektrogeräte nur von entsprechend ausgebildetem
Personal, beispielsweise Elektrikern, angeschlossen werden. Prüfen Sie, ob das in Ihrem Land zutrifft.
Schließen Sie das Netzkabel nur an eine geerdete Steck
dose- an.

DANGER

Afin d’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 à effectuer ce branchement.
Assurez-vous que la prise sur laquelle vous raccordez le
cordon d’alimentation est effectivement reliée à la terre.

AVISO

Para evitar daños generales, es importante tener cuidado
a la hora de conectar el cable de alimentación del concentrador. En algunos países existen estipula ciones para
que la conexión la tenga que hacer una persona autorizada.
Hay que comprobar que se conecta el cable de alimenta
ción a una toma conectada a tierra.

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. (Page 3-2)

VORSICHT

Das Stromkabel in diesem Gerät ist mit einem Schutzleiter
versehen. Um optimale Sicherheit zu gewährleisten,
dürfen Sie es nur an eine ordnungsgemäß geerdete
Schuko-Steckdoseanschließen.

DANGER

Cetéquipement est mis à la terre au moyen du fil de terre
ducordon d’alimentation secteur. Afin d’assurer une protection efficace contre tout risque d’électrocution, cet
équipement doit être raccordé à une prise secteur équipée
d’un contact de mise à la terre effectivement relié à la terre
secteur du bâtiment.

AVISO

El producto consta de un cable de tierra en el enchufe
trifásicodel cable deal imentación. Para evitar el riesgo
continuado de descargas eléctricas, este producto debe
conectarse en una toma de pared trifásica que tenga un
terminal detierracon una conexión fiable a la toma de tierra del edificio.

CAUTION

Make sure that the bend radius of any fiber optic cable is
2.5 centimeters (1 inch) or greater. (Page 3-5)

ACHTUNG

Der Biegungsradius von faseroptischen Kabeln muß mindestens 2,5 cm betragen.

ATTENTION

Assurez-vous que le rayon de courbure des fibres optiques n’est jamais inférieur à 25 mm.

PRECAUCION

Hay que comprobar que el radio de inclinación de cualquier cable óptico defibra es de es de 2,5 centímetros (1
pulgadas) o mayor.

xii

Preface

This manual explains how to install the DECconcentrator 500 single-mode option
cards into the DECconcentrator 500 system. The single-mode Network Management Card and the Port Card options provide long-distance links to the Fiber Distributed Data Interface (FDDI) over single-mode fiber.
Intended Audience
This manual is for:

• The hardware installer
• The system/network manager
The hardware installer and system/network manager should be familiar with fiber
optic network technologies, the FDDI ANSI X3T9 standards, and safety procedures.

Structure of This Guide
This guide has three chapters and six appendixes:
Chapter 1

Provides an overview and physical description of the
DECconcentrator 500 single-mode Network Management
and Port Card options.

Chapter 2

Describes how to install the single-mode Network
Management Card and the Port Card.

xiii

Chapter 3

Describes how to verify the installation of the single-mode
Network Management Card and Port Card.

Appendix A

Describes single-mode cable plant specifications.

Appendix B

Describes how to test and measure the relative power loss
of a single-mode fiber optic cable link.

Appendix C

Contains the DECconcentrator 500 identification list.

Appendix D

Contains vendor information for purchasing patch cables,
connector couplers, and inline loss element connectors.

Appendix E

Contains the software microcode upgrade package part
numbers.

Appendix F

Lists related documents.

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

xiv

1
Single-Mode Option Cards

This chapter provides an overview and physical description of the single-mode
option cards. Single-mode option cards allow devices that are connected to
single-mode fiber to participate in the FDDI network.

1.1 Single-Mode Option Cards
Figure 1–1 identifies the three single-mode Network Management Cards and the
single-mode Port Card.
Figure 1–1:

Single-Mode Option Cards

DEFCN-CA
Network
Management
Cards

DEFCN-DA
DEFCN-EA

Port Card

DEFCN-FA

Legend :

Single-mode

Multimode

LKG–4830-90I

1–1

1.1.1 Network Management Cards

The Network Management Card has two ports and two switches on the front panel
(see Figure 1–2). It is available in three versions:

•

DEFCN-CA — Port A is single-mode and port B is multimode.

•

DEFCN-DA — Port A is multimode and port B is single-mode.

•

DEFCN-EA — Port A and port B are single-mode.
NOTE
The Network Management Card must be installed in
the top slot of the DECconcentrator 500.

Figure 1–2:

Single-Mode Network Management Card Switches
Switch 1 (left switch): resets to factory defaults
Switch 2 (right switch): write enable/disable

Network
Management
Card

DECconcentratorTM 500

Port
Cards
LKG–4827-90I

The switches are used for initialization after option card installation. Each of the
switches is a dual-position switch. Figure 1–3 shows the three types of switches that
may be on the card. Refer to Table 1–1 for the Network Management Card switch
settings.

1–2

DECconcentrator 500 Single-Mode Option Card Installation

Figure 1–3:

Types of Network Management Card Switches

Rocker

Slide
OFF
= Default setting

ON
LKG-4853-91I

CAUTION !
Use a pointed tool to change the switch settings. Never use a pencil; graphite can damage the switches.
Table 1–1:

Network Management Card Switch Settings

Switch
1
(resets to default)

Default
Setting

Function

OFF

When set to OFF at power up or restart, no action occurs.
When set to ON at power up or restart, this switch resets any
system parameters that have been altered through remote
management to the default settings.
To reset after the concentrator is installed and operational:
1. Set the switch to ON.
2. Turn the power on and wait for self-test to complete.
3. Set the switch to OFF.

2
(write enable/
disable)

Single-Mode Option Cards

OFF

When set to ON, enables write access including downline
upgrade.

1–3

1.1.2 Port Card

A single-mode Port Card has four ports and no switches.
NOTE
If there is no Network Management Card, you must
install the single-mode Port Card in the top slot to
ensure that the safety labels are visible.

The Port Card has one version:

•

DEFCN-FA — Two single-mode M ports and two multimode M ports:
–

The two single-mode ports connect single attachment stations with singlemode fiber to the network.

–

The two multimode ports connect single attachment stations with multimode fiber to the FDDI network.

1.2 Laser Safety Information
WARNING

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

The DECconcentrator single-mode option cards use laser sources. The laser sources
conform to the Class 1 safety regulations of the Center for Diseases and Radiological
Health (CDRH) of the United States Department of Health and Human Services,
Public Health Service, and the Food and Drug Administration. Class 1 laser devices
are not considered to be hazardous.

1–4

DECconcentrator 500 Single-Mode Option Card Installation

2
Installing the Option Card

This chapter explains the following:

•

Checking the shipment contents

•

Disconnecting the power and data cables

•

Removing a blank panel or a previously installed option card

•

Installing the option card
CAUTION

Static electricity can damage modules and electronic
components. Digital recommends you use a grounded
wrist strap and a grounded work surface (Digital P/N
29-11762) when you handle modules or internal parts.
Do not remove any option cards you may have from
their antistatic bags until instructed to do so in the
installation procedure.
NOTE
The only tool required for installation is a Phillipshead screwdriver.

If you experience any problems with the installation, refer to the problem-solving
section of the DECconcentrator 500 Installation manual. Observe all cautions when
you install an option card.

2–1

2.1 Checking the Shipment Contents
Refer to Figure 2–1 to check the contents of your shipment. Do not remove an option
card from its antistatic bag until instructed to do so.

•

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

•

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

Figure 2–1:

Checking the Contents of Your Shipment

Warranty

DECconcentrator 500
Single-Mode Option
Card Installation
manual

Network Management
Card
(Antistatic bag)

Port Card
Loopback Connector
LKG–4829-90I

2–2

DECconcentrator 500 Single-Mode Option Card Installation

2.2 Disconnecting the Power and Cables
NOTE
Adding an option card disrupts network traffic.
Digital recommends that you add an option card
when you know that there will be little or no use of
the network.

Remove the power and data cables from the DECconcentrator 500 as follows:
1. Disconnect the power cord from the power source.
2. Disconnect any fiber optic cable from the unit that prevents access to the slot
where the option card is to be installed. Note the cable orientation and port
location for each cable you remove.

Installing the Option Card

2–3

2.3 Removing a Blank Panel or a Previously Installed Option Card
To remove a blank panel or a previously installed option card, do the following:
1. Place the antistatic wrist strap around your wrist and attach the other end of
the strap to the concentrator chassis.
2. Use a Phillips-head screwdriver to push-in and turn the two captive screws
counterclockwise one-quarter turn.
3. Unlock the locking levers (see Figure 2–2). Remove the blank panel or option
card.
Figure 2–2:

Removing a Blank Panel or a Previously Installed Option Card

1/4 turn

Locked

Unlocked
LKG–4831-91I

2–4

DECconcentrator 500 Single-Mode Option Card Installation

2.4 Installing an Option Card
If you are reinstalling a Network Management Card, notify the system/network manager that you are resetting the switches to the default setting.
NOTE
Always install the Network Management Card in the
top slot of the DECconcentrator 500.
If you are installing only Port Cards, install the
single-mode Port Card in the top slot to ensure that
the safety labels are visible.

To install an option card, do the following:
1. Attach the antistatic wrist strap around your wrist and attach the other end of
the strap to the concentrator chassis.
2. Carefully remove the option card from its antistatic bag. Make sure that the
locking levers on the option card are in the outward (unlocked) position.
3. Slide the option card into the appropriate slot. Make sure that the sides of the
option card are seated in the guides of the DECconcentrator 500. Push firmly
into place.
4. Lock the option card in place and turn the two captive screws clockwise onequarter turn (see Figure 2–3).
NOTE

If the card is a Network Management Card, refer to
Figure 1–2 and Table 1–1 for information about
the card switches.
5. Remove the antistatic wrist strap from your wrist and from the concentrator.

Installing the Option Card

2–5

Figure 2–3:

Installing Option Cards

Unlocked

Locked

1/4 turn

LKG-4826-90I

2–6

DECconcentrator 500 Single-Mode Option Card Installation

3
Verifying the Installation

This chapter contains the procedures to connect the power and fiber optic cables. It
also explains how to verify the operation of the DECconcentrator 500 unit and the
ports.

3.1 Applying Power
WARNING

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 these procedures.
Do not apply power to the unit unless all covers are
installed.
WARNING

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.

3–1

To verify the DECconcentrator 500 option card installation, do the following:
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
If you installed a Network Management Card, go to
step 1. If you installed a Port Card, go to step 2.

1. Set switch 1 on the Network Management Card to the ON position (refer to
Figure 1–3).
2. Plug the power cord into the concentrator first and then into the wall outlet.
This applies power to the concentrator and starts the self-test. Refer to the
self-test section in the DECconcentrator 500 Installation manual.
After the self-test is complete, the port LEDs blink green. If the LEDs are not blinking green, refer to the problem-solving section in the DECconcentrator 500 Installation manual.
3. Set switch 1 to OFF (if you installed a Network Management Card).
4. Set switch 2 to ON for network management; otherwise, leave switch 2 set to
OFF.

3.2 Loopback Testing
The loopback test determines whether the DECconcentrator 500 Network Management Card or Port Card is faulty. This test can also determine whether there is a problem with the cable or the device at the end of the cable. The port LED should be
blinking green before you start the loopback test. Steps 1 through 3 describe how to
perform the loopback test.

3–2

DECconcentration Single-Mode Option Card Installation

1. Remove the protective cap from the port to be tested.
NOTE
To avoid additional optical power loss, do not touch
the fiber ends. Always replace protective caps when
the fiber is not connected.

2. Connect the loopback connector to the port to be tested. Use the appropriate
loopback connector for the port you are testing (see Figure 3–1).
Figure 3–1:

Loopback Connectors

Multimode loopback connector

Verifying the Installation

Single-mode attenuated
loopback connector

LKG-4621-90I

3–3

After loopback connection, the port LED blinks red (see Figure 3–2). This indicates
successful completion of the loopback test. If the LEDs do not match Figure 3–2,
refer to the problem-solving section in the DECconcentrator 500 Installation manual.
3. Remove the loopback connector. The port LED blinks green again.
Figure 3–2:

Port LED Status During Loopback Testing

Controller/
backplane
Fan
LED
LED

= OFF
= ON (Green only; on solid )
= ON (Green only; blinking)

Power
LED

= ON (Red only; blinking)

DECconcentratorTM 500

Card
Fault
LED

Port A
LED

Port B
LED

Network Management Card

Ring
Operational
LED

Card
Fault
LED

Port 0
LED

Port 1
LED

Port 2
LED

Port 3
LED

Port Cards
LKG-4823-90I

3–4

DECconcentration Single-Mode Option Card Installation

3.3 Connecting Fiber Optic Cables
NOTE
For single-mode and multimode fiber optic cable
specifications, refer to the FDDI Network Configuration Guidelines manual.

As shown in Figure 3–3, use keyed connectors with FDDI PMD multimode ports.
Use FC/PC-type connectors with single-mode fiber ports.
Figure 3–3:

Types of Connectors

Multimode
FDDI PMD Keyed Connector

Single-mode
2.5-mm FC-type Connector

FDDI PMD keying
LKG–4824-90I

CAUTION

Make sure that the bend radius of any fiber optic
cable is 2.5 centimeters (1 inch) or greater.

Steps 1 through 4 describe how to the connect fiber optic cables.
1. Pull the protective cap or rubber boot from the port and fiber optic cable plug.

Verifying the Installation

3–5

NOTE
To avoid additional optical power loss, do not touch
the fiber ends. Always replace protective caps when
the fiber is not connected.

2. Connect the fiber optic cable to the appropriate connector. Transmit and receive icons are marked on the handle of single-mode ports. Figure 3–4 shows
connecting the FDDI keyed connector and the FC/PC-type connector. Make
sure that the correct cable plant fiber is attached to the correct transmit and
receive connector.
Figure 3–4:

Connecting Keyed FDDI Cables and FC/PC-type Cables

Protective
caps

Protective caps
Multimode

Single-mode

LKG–4825-90I

3. Observe the LEDs as you connect the fiber optic cables (Figure 3–5).

3–6

DECconcentration Single-Mode Option Card Installation

NOTE
Figure 3–5 assumes that all ports are connected to active
stations.
Figure 3–5:

LEDs — Fully Configured and Cabled DECconcentrator 500

Controller/
backplane
Fan
LED
LED

= OFF
= ON (Green only)
= Connected Cable

Power
LED

DECconcentratorTM 500

Card
Fault
LED

Port A
LED

Port B
LED

Ring
operational
LED

Network Management Card

Card
Fault
LED

Port 1
LED

Port 2
LED

Port 3
LED

Port 4
LED

Port Cards
LKG-4625-91I

If the LEDs for single-mode ports do not indicate proper DECconcentrator 500 operation, interchange the transmit and receive single-mode fiber optic cable connectors.
If the interchange does not work, refer to the problem-solving section of the DECconcentrator 500 Installation manual.
4. For each cable connected to the concentrator, add the cable identification
number to the DECconcentrator 500 Identification List in Appendix C.

Verifying the Installation

3–7

A
Specifications for Single-Mode
Fiber Optic Cable

This appendix describes the specifications required for the single-mode fiber optic cable.
NOTE
Verify that the installation site meets the physical,
environmental, power, and cabling requirements for
the DECconcentrator 500. Check the cable plant log
book entry for the cable plant certification. If the
cable plant is not certified, refer to Appendix B for
instructions on how to check the cable plant or contact your Digital customer service representative.

A.1 Fiber Optic System Requirements
The single-mode option cards use a 1300-nm optical system with low-power laser
transmitters operating with single-mode fiber. Digital recommends using standard
telecommunications grade dispersion unshifted single-mode fibers (EIA/TIA
492BAAA). The fiber must conform to Digital general specification
1710003-GS.
The optical system used in the single-mode option cards require:

•

A cable plant with a minimum of 12 decibels (dB) of loss and a maximum of
22 dB of loss

•

Cable plant loss data to be measured at a nominal wavelength of 1300 nm

A–1

A.1.1 Connecting the Cable Plant

The cable plant is connected to the single-mode fiber option cards with FC/PCtype connectors. Patch cables can be used to connect the termination of the single-mode fiber cable plant to the single-mode fiber option cards. The patch cables
can be used to translate different connector types. Refer to the FDDI Network
Configuration Guidelines manual for additional cable plant information.
A.1.2 Special Cable Plant Considerations

Considerations apply to cable plants with less than 12 dB of loss and cable plants
longer than 10 km (6.2 mi) . For control of system loss, Digital recommends the
use of high-quality, low-loss (< 0.6 dB) connectors and high return-loss (>20 dB)
connectors. Refer to section A.3.2 for additional information on cable plant backreflection.
The connectors are available from many fiber optic suppliers (see Appendix D).

A.2 Patch Cable Requirements
Single-mode patch cables are used to connect the option cards to the single-mode
fiber cable plant. One end of the patch cable is connected to the FC/PC-type connector. The other end of the patch cable is fitted with the appropriate connector
type that matches the existing cable plant.
The single-mode fiber in the patch cables must conform to EIA/TIA 492BAAA
and have a cutoff wavelength of 1240 nm or less. If the fiber-cutoff wavelength
data is unavailable, the patch cable must be at least 2 m (6.6 ft) long and have two
7.6-cm (3-in) diameter loops in it.
You can purchase single-mode patch cables from many vendors. See Appendix D
for a partial listing of the vendors.

A–2

DECconcentrator 500 Single-Mode Option Card Installation

A.3 Inline Loss Elements
Inline loss elements are required for cables with less than 12 dB of loss. The following specifications apply over the operational wavelength range of the DECconcentrator optical system (1278 to 1342 nm):

•

In single-mode cable plants with 0 to 6 dB of loss, the installer must include
an inline loss element with 12 to 16 dB of loss.

•

In single-mode cable plants with 6 to 12 dB of loss, the installer must include
an inline loss element of 6 to 10 dB.

You can purchase inline loss elements from many vendors. See Appendix D for a
partial listing of the vendors.
A.3.1 Cable Plant Concerns

If the cable is longer than 10 km (6.2 mi), a penalty is added to the loss budget as
shown in the following example:
Loss penalty = (0.06 dB/km) • cable length
Total loss = measured cable loss + loss penalty
The total loss must be less than 22 dB.
This penalty reserves a portion of the power budget to correct the potential mismatch between the DECconcentrator 500 single-mode fiber optical system operating wavelength and the wavelength used to measure the installed loss of the
single-mode fiber cable. A loss-test wavelength range of 1275 to 1325 nm can
cause an underestimation of the cable attenuation of 0.06 dB/km. Refer to Appendix B for information on how to measure the cable plant loss. This measurement
includes the loss penalty.

Specifications for Single-Mode Fiber Optic Cable

A–3

A.3.2 Cable Plant Back-Reflection

Optical cable plant back-reflection is the return of optical power to the system
transmitter. Back-reflection is caused by connectors, splices and inline loss elements. Back-reflection is a ratio, in decibels, of reflected optical power to optical
power incident in the cable plant.
High levels of back-reflection may degrade the performance of the single-mode
fiber optical system. Back-reflection can be controlled by using properly designed cable plant components. Digital recommends using components with low
optical return loss (nonair gap). Cable plant components must comply with the
FDDI single-mode fiber PMD required minimum of 20-dB optical return loss.
NOTE
When planning to upgrade to a higher bit-rate system,
consider specifying an optical-return loss of 30 dB or
greater.

A–4

DECconcentrator 500 Single-Mode Option Card Installation

B
Single-Mode Relative Power
Loss Test

This appendix explains how to measure the relative power loss of a single-mode
fiber optic cable link. This test uses the 1300-nm single-mode relative power loss
test kit.
The test involves:

•

Launching a premeasured quantity of optical power into the cable being
tested

•

Measuring the power at the opposite end of the cable with an optical power
meter.

The difference between the launched power and received power is a measure of
the optical loss in the cable link.
The wavelength and launch characteristics of the optical test source must simulate the system source as closely as possible. For example, if the wavelength of
the optical test source differs by 50-nm from the system source, the measured loss
differs from the actual system loss by as much as 0.06 dB per kilometer. For a
40-km (24-mi) link, this introduces an error of 2.4 dB.

B–1

B.1 Single-Mode Relative Power Loss Test Kit
The 1300-nm single-mode relative power loss test kit (Digital P/N 29-29033-01)
contains:

•

A FOTEC optical laser (LD) test source, 1300-nm nominal wavelength,
equipped with a fixed FC-type connector

•

A single-mode launch cable, terminated on both ends with FC/PC-type connectors

•

An AC transformer

•

Three FC-type connector couplers

•

A consumables kit containing clean wipes

The test also requires the following items:

•

An INTELCO optical power meter, part of the Dual Window Power Loss test
kit (Digital P/N FC-10138-AC)

•

An FC-type power meter adapter (Digital P/N 29-29036-01)

B.2 Before Testing for Relative Power Loss
NOTE
Before beginning the test procedure, copy the blank
worksheets located at the end of this appendix. You
will need two copies of worksheet 1 and one copy of
worksheet 2 for each pair of optical fibers that you are
testing.

Before testing for relative power loss, keep the following precautions in mind.
Following them will help to ensure accurate test results.

B–2

•

Use care when handling fiber optic cables and connectors. If cables are bent
or twisted, damage can occur, especially near the connectors.

•

Avoid dropping or otherwise physically impacting connectors; doing so can
impair optical transmission.

DECconcentrator 500 Single-Mode Option Card Installation

•

Always clean the connectors before testing. Clean the connectors during testing as necessary. Use pads dipped in alcohol to remove dust, debris, or fingerprints from the fiber end of the connector.

B.3 Measuring the Relative Power Loss
To measure the relative power loss, follow steps 1 through 6.
1. Place the optical test source close to the fiber links to be tested.
2. Set up the optical test source as follows:
a. Connect the optical test source to ac power, if available.
b. Using worksheet 1, enter the value of the Optical Test Source Wavelength, recorded on the label on the back of the optical test source.
c. Record the test source being used.
d. Clean and then connect the launch cable to the optical source (see
Figure B–1).
Figure B–1: Setting Up the Optical Test Source and Power Meter

Launch
cable

Optical
test source

FC
adapter

Power
meter

LKG–4631–90I

Single-Mode Relative Power Loss Test

B–3

3. Set up the power meter as follows:
a. Attach the FC-type adapter to the meter.
b. Clean the connector on the launch cable and connect it to the power meter.
c. Turn on the optical test source and the power meter.
d. Push the wavelength (λ) button on the power meter until the display
reads 1300 nm.
4. Perform the following reference-level-adjustment procedure:
a. Wait five minutes for the optical test source to stabilize.
NOTE
Once the optical test source is turned on, do not turn it
off until all measurements are completed.

b. Store the reference value in the meter by pressing the STO REF button
on the meter twice.
c. Turn off the power meter and disconnect the launch cable from the power
meter.
5. Measure the cable loss as follows:
a. Enter the Test Date and the Cable Identification Number for the cable
to be tested on the worksheet.
b. Connect the launch cable to the cable under test with an FC-type connector coupler (see Figure B–2).
c. Go to the receive end (other end) of the cable being tested.
d. Clean the connector at the receive end of the cable under test and attach it
to the power meter.
NOTE
If patch cables to the network devices are not present,
use a jumper cable from the patch panel to the power
meter.

B–4

DECconcentrator 500 Single-Mode Option Card Installation

e. Turn on the power meter and read the display to make sure the 1300-nm
range is selected. Push the wavelength (λ) button until the display reads
1300 nm.
f. Press the dB button and record the reading.
Figure B–2: Connecting Cables

Transmit
end of cable
under test
Coupler
Receive
end of cable
under test

Optical
test source

Power
meter

LKG–4632–90I

6. Calculate the total wavelength corrected cable loss using worksheet 1 as
follows:
a. Note the dB value (including the minus sign) displayed on the power meter. Enter the value on line 1 of the worksheet. This is the Measured Relative Loss.

Single-Mode Relative Power Loss Test

B–5

b. Round off the cable length to the next tenth of a kilometer. For example,
if the cable length is 13.75 km, round-off to 13.8 km. If the cable length
is unknown, use an Optical Time Domain Reflectometer (OTDR) to measure it. Enter the rounded-off value on line 2 of the worksheet. This is the
Length of Tested Cable.
c. Multiply the Wavelength Correction Value (0.06 dB/km), line 3 by the
Length of Tested Cable (line 2). This is the Total Wavelength Correction. Enter the result on line 4 of the worksheet.
d. Using a calculator, subtract the Total Wavelength Correction (line 4)
from the Measured Relative Loss (line 1). This is the Wavelength Corrected Cable Loss. Enter the result on line 5 of the worksheet.

B.4 System Certification Procedure
Table B–1 defines the minimum attenuation and system power budget for Digital
devices used on a single-mode fiber optic cable link.
Table B–1: System Power Budget for 1300 nm
Product Family

Minimum
Attenuation

System Power
Budget

Digital FDDI

12 dB1

22 dB at 1300 nm

If attenuation is less than this value, use the appropriate inline loss element to induce the
required loss (refer to Table B–2).

Use worksheet 2 to perform the cable system certification procedure as follows:
1. Enter the Network Product on worksheet 2.
2. Enter the System Power Budget from Table B–1 on line 1 of worksheet 2.
3. Calculate the Maintenance Splice value by allowing 0.5 dB per cable segment for future maintenance splices. Enter the value on line 2 of the worksheet. For example, if the end-to-end link consists of two cable segments
concatenated by a patch panel, enter 1.0 dB (2 • 0.5 dB).
4. Calculate the Cable Power Budget by subtracting line 2 from line 1. Enter
the value on line 3 of worksheet 2. The derated budget allows for measurement uncertainty and for future cable repairs.

B–6

DECconcentrator 500 Single-Mode Option Card Installation

5. Compare the Wavelength Corrected Cable Loss (line 5, worksheet 1) to the
Cable Derated Power Budget (line 3, worksheet 2). Ignore any minus signs.
If the value from worksheet 1 is less than the value on worksheet 2, the
Wavelength Corrected Cable Loss is acceptable.
6. If the Wavelength Corrected Cable Loss is acceptable, refer to Table B–2 to
determine whether an inline loss element needs to be installed on the cable.
The cable requires an inline loss element if it has less than 12 dB of loss.
Refer to Appendix D for inline loss element vendors.
Table B–2: Cable Loss Range and Inline Loss Element to Use
Wavelength Corrected
Cable Loss Range

Inline Loss Element to Use

0 dB–6 dB

12 dB–16 dB

6 dB–12 dB

6 dB–10 dB

12 dB–22 dB

None needed

If you successfully planned and designed the cable plant, you have allowed for
splice loss, connector coupling, and future maintenance of the installation. The
calculated Cable Derated Power Budget allows for future maintenance of the
cable plant. Future maintenance includes splices or replacement of network device transmitters/receivers.

Single-Mode Relative Power Loss Test

B–7

Worksheet 1: Single-Mode Cable Loss

Test Date:
Cable I.D.:
Optical Test Source
Wavelength:

Test Source:

FOTEC

(1)

Measured Relative Loss

(2)

Length of Tested Cable

(3)

0.06 dB/km

Wavelength Correction Value

Total Wavelength Correction

(4)
(Multiply 2 by 3)
(5)
(Subtract 4 from 1)

B–8

Wavelength Corrected Cable
Loss

DECconcentrator 500 Single-Mode Option Card Installation

Worksheet 2: Cable Derating

Single-Mode Network Product:
(For example: DEFCN-CA, DEFCN-DA)

(1)

System Power Budget
(From Table B–1)

(2)

Maintenance Splices
(Minimum of 0.5)

(3)
(Subtract 2 from 1)

Single-Mode Relative Power Loss Test

Cable Derated Power Budget

B–9

C
DECconcentrator 500
Identification List

Use the DECconcentrator 500 Identification List to record the following information:

•

DECconcentrator 500 model number

•

DECconcentrator 500 serial number

•

Network Management Card

•

–

cable ID number

–

hardware address

–

ports used

–

switch 1 setting

–

switch 2 setting

Port Card
–

ports used

–

cable ID number

Fill in the DECconcentrator 500 Identification List (see Figure C–1) and give a
copy to the system/network manager.

C–1

Figure C–1: DECconcentrator 500 Identification List

DECconcentrator 500 Model Number
DECconcentrator 500 Serial Number
Network Management Card: Hardware address
Network Management Card: switch 1 setting
Network Management Card: switch 2 setting
Network Management Card: ports used
Port A cable ID number
Port B cable ID number
First Port Card: ports used
Port 1 cable ID number
Port 2 cable ID number
Port 3 cable ID number
Port 4 cable ID number
Port 5 cable ID number
Port 6 cable ID number
Second Port Card: ports used
Port 1 cable ID number
Port 2 cable ID number
Port 3 cable ID number
Port 4 cable ID number
Port 5 cable ID number
Port 6 cable ID number
Third Port Card: ports used
Port 1 cable ID number
Port 2 cable ID number
Port 3 cable ID number
Port 4 cable ID number
Port 5 cable ID number
Port 6 cable ID number

C–2

DECconcentrator 500 Single-Mode Option Card Installation

D
Vendors and Part Numbers

The Appendix contains part descriptions, part numbers, and vendor names and
addresses.

D.1 Patch Cables
You can purchase single-mode patch cables from many vendors. Table D–1 and
Table D–2 list the patch cable descriptions and part numbers. Equivalent cables
from other vendors can be substituted.
Table D–1: Single-Mode Fiber Patch Cables (Duplex)
Patch Cable

Anixter Brothers
Part Number

3M FC to FC

FCFC3

3M FC to ST

FCST3

3M FC to Biconic

FCB3

10M FC to FC

FCFC10

10M FC to ST

FCST10

10M FC to Biconic

FCB10

D–1

Table D–2: Single-Mode Fiber Patch Cables (Simplex)
Patch Cable

AMP Incorporated
Part Number

AT&T Part
Number

Dorran/3M
Part Number

3M FC to FC

501868-4

LS2H2-H2-10

AALAL-AT0003

LS2H2-E-10

AALAM-AT0003

3M FC to ST
3M FC to Biconic

502141-3

LS2H2-A-10

AAAAL-AT0003

10M FC to FC

501868-1

LS2H2-H2-32

AALAL-AT0010

LS2H2-E-32

AALAM-AT0010

LS2H2-A-32

AAAAL-AT0010

10M FC to ST
10M FC to Biconic

502141-0

D.2 Connector Couplers
You can purchase connector couplers from many vendors. Table D–3 and
Table D–4 list the coupler descriptions and part numbers. Equivalent parts from
other vendors may be substituted.
Table D–3: Connector Coupler
Coupler

Dorran/3M
Part number

AMP Incorporated
Part Number

FC to FC Coupler

02-00075

501506-1

Table D–4: Connector Coupler Panel

D–2

Coupler

AT&T
Part Number

Coupler Panel (accepts 6 couplers)

105 428 254

DECconcentrator 500 Single-Mode Installation

D.3 Single-Mode Inline Loss Element
You can purchase inline loss elements from many vendors. Table D–5 lists the
inline loss element descriptions and part numbers. Equivalent parts from other
vendors may be substituted.
Table D–5: Inline Loss Element
Inline Loss Element

Amphenol Corporation Part
Number

Aster Corporation
Part Number

6 dB-10 dB

945-999-1468-8

AS0170

12 dB-16 dB

945-999-1468-14

AS0165

D.4 Vendor Information
The following charts identify the product and provide vendor addresses and telephone numbers.

Single-Mode Fiber Patch Cable (Duplex)
Anixter Brothers
4711 Golf Road
Skokie, IL 60076
Boston office

(708) 677-2600
(508) 682-8870

Single-Mode Fiber Patch Cable (Simplex)
AMP Incorporated
P.O Box 3608
Harrisburg, PA 17105
AT&T
2000 Northeast Expressway
Norcross, GA 30071

Vendors and Part Numbers

(717) 564-0100 or (800) 522-6752

(800) 824-1931

D–3

Single-Mode Connector Coupler
Dorran/3M
10 Industrial Street
Eatontown, NJ 07724

(201) 544-0938

Single-Mode Connector Coupler Panel
AT&T
2000 Northeast Expressway
Norcross, GA 30071

(800) 824-1931

AT&T Network Systems

(800) 344-0223

Extension 020

Single-Mode Inline Loss Element

D–4

Amphenol Corporation
1925 A Ohio Street
Lisle, IL 60532

(708) 960-1010

Aster Corporation
113 Cedar Street
Milford, MA 01757

(508) 478-5995

DECconcentrator 500 Single-Mode Installation

E
Software Microcode
Upgrade Part Numbers

Digital Equipment Corporation plans periodic software microcode updates. Contact
your sales representative or see the Network Buyer’s Guide to find out if new software
microcode is available. Table E–1 lists the software microcode upgrade package part
numbers and the media on which they are available.
Table E–1:

Upgrade Packages

Upgrade Package Media

Digital Part
Number

FDDI DECconcentrator 500 Software Upgrade Package
for VMS, 16MT9

QB-YX2A9-AA

FDDI DECconcentrator 500 Software Upgrade Package
for VMS, TK50

QB-YX2A9-AB

FDDI DECconcentrator 500 Software Upgrade Package
for ULTRIX/VAX, 16MT9

QB-YX2A9-AC

FDDI DECconcentrator 500 Software Upgrade Package
for ULTRIX/VAX, TK50

QB-YX2A9-AD

FDDI DECconcentrator 500 Software Upgrade Package
for ULTRIX/RISC, 16MT9

QB-YX2A8-AE

FDDI DECconcentrator 500 Software Upgrade Package
for ULTRIX/RISC, TK50

QB-YX2A8-AF

E–1

F
Related Documents

The following documents contain additional information. Refer to the back of
this manual for ordering information.

•

DECconcentrator 500 Problem Solving (Order No. EK-DEFCN-PS)
This manual describes isolating DECconcentrator 500 faults to the field-replaceable unit (FRU) and removing and replacing each FRU. This is a field
problem-solving manual.

•

DECbridge 500/600 Installation and Upgrade (Order No. EK-DEFEB-IN)
This manual describes the installation and upgrade procedures for the
DECbridge 500/600 series.

•

DECbridge 500/600 Problem Solving (Order No. EK-DEFEB-PS)
This manual describes isolating DECbridge 500/600 faults to the field-replaceable unit (FRU) and removing and replacing each FRU. This is a field
problem-solving manual.

•

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

F-1

•

DECconnect System Fiber Optic Installation (Order No. EK-DECSY-FI)
This manual describes how to install a DECconnect System fiber optic cable
plant.

•

DECelms Installation (Order No. AA-PAK1A-TE)
This manual describes how to install and verify DECelms (DEC Extended
LAN Management Software) on a VMS system.

•

DECelms Reference (Order No. AA-PBWBA-TE)
This is a reference manual to the DECelms (DEC Extended LAN Management Software) commands.

•

DECelms Use (Order No. AA-PAK2A-TE)
This manual 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 units.

•

DECmcc Installation (Order No. AA-PD58-BTE)
This manual describes how to plan for and install DECmcc.

•

DECmcc Bridge Access Module Use (Order No. AA-PD1BC-TE)
This manual describes the DECmcc bridge entity model, entity management,
and the directives necessary to perform typical management operations.

•

DECmcc Concentrator Access Module Use (Order No. AA-PH31A-TE)
This manual describes the DECconcentrator 500 entity model, entity management, and the directives necessary to perform typical management operations.

•

Fiber Distributed Data Interface Network Configuration Guidelines
(Order No. EK-DFDDI-CG)
This manual describes the guidelines for connecting devices to an FDDI network. It also includes network configuration examples and cable specifications.

F-2

DECconcentrator 500 Single-Mode Option Card Installation

•

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

Additional Networking Documentation
Refer to the Network Management Software documentation specific to your network product. Also refer to the following documents for additional information.

•

Networks and Communications Product Documentation
(Order No. EK-NACPD-RE)
This manual lists the title and order number for each publication associated
with Digital Equipment Corporation’s Networks and Communications products.

•

Network Buyer’s Guide
This guide describes Digital’s networking products. Contact your local sales
office to receive a copy.