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Document:	DECconcentrator 500 ThinWire & Shielded Twisted-Pair Inst
Order Number:	EK-DEFCN-CM
Revision:	002
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DECconcentrator 500

ThinWire and Shielded Twisted-Pair
Option Card Installation

Order Number: EK-DEFCN-CM-002

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.

DECconcentrator 500

ThinWire and Shielded Twisted-Pair
Option Card Installation

January 1992
This manual describes how to install and check the
DECconcentrator 500 ThinWire and Shielded Twisted-Pair
option cards.
Supersession/Update Information:

Order Number: EK-DEFCN-CM-002

This is a revised manual.

EK-DEFCN-CM-002
January 1992

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

ThinWire

Hewlett-Packard is a registered trademark of Hewlett-Packard Company.
IBM is a registered trademark of International Business Machines Incorporated.
ST is a registered trademark of American Telephone and Telegraph.
Tektronix is a registered trademark of Tektronix, Incorporated.

This manual was produced by Telecommunications and Networks Publications.

Contents
Safety

Preface

Installing the Option Card
1.1
1.2
1.3
1.4
1.5

Checking the Shipment Contents . . . . . . . . . . . . . . . . . . . . . . . .
Identifying the Option Cards . . . . . . . . . . . . . . . . . . . . . . . . . . .
Disconnecting the Power and Data Cables . . . . . . . . . . . . . . . . .
Removing a Blank Panel or a Previously Installed Option Card
Installing an Option Card . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

1–2
1–3
1–3
1–4
1–5

Verifying the Installation
2.1
2.2
2.3
2.3.1
2.3.2
2.3.3
2.4

Applying Power . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Loopback Testing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Cableplant . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Cabling Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
ThinWire Cableplant . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Shielded Twisted-Pair Cable Evaluation . . . . . . . . . . . . . . . .
Connecting Data Cables . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

2–1
2–2
2–5
2–5
2–5
2–7
2–8

iii

ThinWire Cable Evaluation Procedure
A.1
A.1.1
A.2

Test Procedure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Evaluating the TDR Test . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Calibrating for Cable Dielectric . . . . . . . . . . . . . . . . . . . . . . . . .

Shielded Twisted-Pair Cable Evaluation Procedure
B.1
B.2
B.2.1
B.3
B.4

Test Set-Up . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Testing for Length and Loss . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Evaluating the TDR Test . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Testing for Continuity and Short Circuit . . . . . . . . . . . . . . . . . .
Calibrating for Cable Dielectric . . . . . . . . . . . . . . . . . . . . . . . . .

DECconcentrator 500 Identification List

Vendors and Part Numbers
D.1
D.2
D.3
D.4

Shielded Twisted-Pair Patch Cables and Cable Types . . . . . . . .
ThinWire Patch Cables and Cable Types . . . . . . . . . . . . . . . . . .
ThinWire and Shielded Twisted-Pair Loopback Connectors . . .
Vendor Information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Related Documents

Glossary

Index

A-1
A-4
A-5

B–2
B–4
B–6
B–6
B–7

D–1
D–2
D–2
D–3

Figures
1–1
1–2
1–3
1–4
2–1
2–2
2–3
2–4
2–5
2–6
2–7
2–8
2–9
A–1
A–2
B–1
B–2
C–1

Checking the Contents of Your Shipment . . . . . . . . . . . . . . . . . .
Copper-Media Port Cards . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Removing a Blank Panel or a Previously Installed Option Card
Installing Option Cards . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Loopback Connectors . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Port LED Status During Loopback Testing . . . . . . . . . . . . . . . .
ThinWire Standard Configuration . . . . . . . . . . . . . . . . . . . . . . .
ThinWire Cross-Connect Configuration . . . . . . . . . . . . . . . . . . .
Shielded Twisted-Pair Standard Configuration . . . . . . . . . . . . .
Shielded Twisted-Pair Cross-Connect Configuration . . . . . . . . .
Types of Data Cables . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Connecting Data Cables . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
LEDs – Fully Configured DECconcentrator 500 . . . . . . . . . . . .
TDR Test Pulse Display – Ideal Termination
(Output Pulse Only) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
TDR Test Pulse Display – Typical Reflection Signature
(Output Pulse and Reflection) . . . . . . . . . . . . . . . . . . . . . . . . . . .
TDR Pulse Display – Ideal Termination . . . . . . . . . . . . . . . . . . .
TDR Test Pulse Display – Typical Reflection Signature
(Output Pulse and Reflection) . . . . . . . . . . . . . . . . . . . . . . . . . . .
DECconcentrator 500 Identification List . . . . . . . . . . . . . . . . . .

1–2
1–3
1–4
1–6
2–3
2–4
2–6
2–6
2–7
2–8
2–8
2–9
2–10

Shielded Twisted-Pair Patch Cables . . . . . . . . . . . . . . . . . . . . . .
Shielded Twisted-Pair Cable Types . . . . . . . . . . . . . . . . . . . . . .
ThinWire Patch Cables . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
ThinWire Cable Types . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Loopback Connectors . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

D–1
D–1
D–2
D–2
D–2

A-2
A-3
B–3
B–5
C–2

Tables
D–1
D–2
D–3
D–4
D–5

Safety

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

WARNING

Contains information to prevent personal injury.

VORSICHT

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

DANGER

Signale les informations destinées à prévenir les accidents
corporels.

AVISO

Contiene información para evitar daños personales.

CAUTION

Contains information to prevent damage to equipment.

ACHTUNG

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

ATTENTION

Signale les informations destinées à prévenir la d étérioration du matériel.

PRECAUCION

Contiene información para evitar daños al equipo.

vii

The warnings and cautions you must observe 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.

CAUTION

Static electricity can damage modules and electronic components. Digital recommends that you use a grounded antistatic wrist strap (P/N 29-11762) and grounded work surface when you handle any 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. (Page 1-1)

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 (P/N 29-11762) al trabajar con cuaquiermódulo 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.

viii

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 2-1)

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, NE
BRANCHEZAUCUN cordon d’alimentation ou autre câble
sans en avoir reçu l’instruction explicite dans la 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 de alimentación 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
outlet. (Page 2-1)

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 Steckdosean.

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 alimentación 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 2-2)

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

Cet équipement 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 effectivementreliéà
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.

Preface
This manual explains how to install the DECconcentrator 500 ThinWire and
Shielded Twisted-Pair option cards into the DECconcentrator 500 unit. The ThinWire and Shielded Twisted-Pair option cards provide links to the Fiber Distributed
Data Interface (FDDI) using copper media.
Intended Audience
This manual is for:

• The hardware installer
• The system/network manager
The hardware installer and system/network manager should be familiar with ThinWire and shielded twisted-pair network technologies, the FDDI ANSI X3T9 standards, and safety procedures.
Structure of This Manual
This manual has two chapters and five appendixes as follows:
Chapter 1

Provides an overview and physical description of the
DECconcentrator 500 ThinWire and Shielded TwistedPair Port Cards. Describes how to install the ThinWire and
the Shielded Twisted-Pair Port Cards into the DECconcentrator 500 unit.

Chapter 2

Describes how to verify the installation of the ThinWire
Port Card and the Shielded Twisted-Pair Port Card. Provides cabling information.

xiii

Appendix A

Contains the ThinWire cable evaluation procedure.

Appendix B

Contains the shielded twisted-pair cable evaluation
procedure.

Appendix C

Contains the DECconcentrator 500 Identification List.

Appendix D

Contains vendor information for purchasing cables and
adapters.

Appendix E

Lists related documents.

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

xiv

1
Installing the Option Card

This chapter explains the following:

•

Checking the shipment contents

•

Identifying the option card

•

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 that you use a antistatic grounded wrist strap (P/N 29-11762) and a
grounded work surface when you handle modules or
internal parts. Do not remove any option cards from
their antistatic bags until the installation procedure
instructs you to do so.
NOTE
The only tool required for this installation is a Phillips-head screwdriver.

1–1

1.1 Checking the Shipment Contents
Refer to Figure 1–1 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.
If parts are missing, contact your Digital sales representative.

Figure 1–1:

Checking the Contents of Your Shipment

DECconcentrator 500
ThinWire and Shielded
Twisted-Pair Option
Card Installation
manual

Option card

(Antistatic bag)
ThinWire loopback
connector shipped with
P/N DEFCN-TA
Shielded twisted-pair
loopback connector
shipped with
P/N DEFCN-SA
LKG-4815-91I

1–2

DECconcentrator 500 ThinWire and Shielded Twisted-Pair Option Card Installation

1.2 Identifying the Option Cards
The copper-media option cards have six PHY (Physical Layer Protocol) M ports.
Figure 1–2 shows the copper-media port cards.
Figure 1–2:

Copper-Media Port Cards

ThinWire
Port Card
P/N DEFCN-TA
Shielded
Twisted-Pair
Port Card
P/N DEFCN-SA
LKG-4814-91I

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

Remove the power and data cables from the DECconcentrator 500 unit as follows:
1. Disconnect the power cord from the power source.
2. Disconnect any 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

1–3

1.4 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.
NOTE
If you are installing an option card in a desktop
DECconcentrator, attach the antistatic wrist strap
to your wrist and attach the other end of the strap to
a grounded surface.

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 1–3). Remove the blank panel or option
card.
Figure 1–3:

Removing a Blank Panel or a Previously Installed Option Card

1/4
turn

Locked
Unlocked
LKG–4831-91I

1–4

DECconcentrator 500 ThinWire and Shielded Twisted-Pair Option Card Installation

1.5 Installing an Option Card
To install an 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.
NOTE
If you are installing an option card in a desktop concentrator, attach the antistatic wrist strap to your wrist
and attach the other end of the strap to a grounded
surface.

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 and
the locking screw is in the vertical 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 locking levers on the option card in place by pushing the locking
levers inward (see Figure 1–4).
5. Turn the two captive screws clockwise one-quarter turn.
6. Remove the antistatic wrist strap from the concentrator and your wrist.

Installing the Option Card

1–5

Figure 1–4:

Installing Option Cards

Unlocked

Locked

1/4 turn

LKG-4817-91I

1–6

DECconcentrator 500 ThinWire and Shielded Twisted-Pair Option Card Installation

2
Verifying the Installation

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

2.1 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.

2–1

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.

To verify the DECconcentrator 500 option card installation, 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.

2.2 Loopback Testing
The loopback test determines whether the DECconcentrator 500 option card is
faulty. This test can also determine whether there’s 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 the procedures to perform the loopback test.
1. Connect the loopback connector to the port to be tested. Use the appropriate
loopback connector for the port you are testing (see Figure 2–1).

2–2

DECconcentrator 500 ThinWire and Shielded Twisted-Pair Option Card Installation

Figure 2–1:

Loopback Connectors

ThinWire
P/N DEFCN-TA

Shielded Twisted-Pair
P/N DEFCN-SA
LKG-4818-91I

Verifying the Installation

2–3

After loopback connection, the port LED blinks red. This indicates successful completion of the loopback test.
Figure 2–2 shows loopback connection to port 1 of the ThinWire option card. If the
LEDs do not match Figure 2–2, refer to the problem-solving section in the
DECconcentrator 500 Installation manual.
Figure 2–2:

Port LED Status During Loopback Testing

Network Management Card
Card
fault
LED

Port A
LED

Controller/
Backplane Fan Power
LED LED LED

Ring
operaPort B tional
LED
LED

DECconcentratorTM 500

= Loopback
connector
= OFF
= ON (Green only;
on solid)
= ON (Green only;
blinking)
= ON (Red only;
blinking)

Card Port 1
fault LED
LED

Port 2 Port 3
LED
LED

Port 4
LED

Port 5
LED

Port 6
LED

Port Cards
LKG-5048-91I

2. Remove the loopback connector. The port LED blinks green again.

2–4

DECconcentrator 500 ThinWire and Shielded Twisted-Pair Option Card Installation

2.3 Cableplant
Ensure that the cableplant has been evaluated. Check the cableplant log book entry
for the cableplant evaluation. The cables must be installed according to the installation guidelines specified by the vendors of each cable type. Refer to Appendix D for
recommended cable types.
2.3.1 Cabling Specifications

ThinWire and Shielded Twisted-Pair Option Cards operate over copper links of a
maximum length of 100 meters.
Verify that each cableplant meets the following critical parameters:

•

The link has a maximum of two patch cables: a crossconnect cable and a
non-spliced, behind-the-wall cable.

•

The cable must be continuous, without any taps or junctions.

2.3.2 ThinWire Cableplant

The ThinWire Option Card uses a bidirectional scheme that sends and receives data
over a single ThinWire coaxial cable. The loss of the cable and the number of junctions in the cable are critical for proper operation at 100 meters. You must perform
the ThinWire evaluation procedure in Appendix A for cable lengths greater than 70
meters.
Refer to Appendix A for the ThinWire cable evaluation procedure.
NOTE
ThinWire cableplant total loss at 62.5 MHz must be less
than 11.5 dB.

•

The ThinWire/10base2 50-ohm coaxial cable must meet or exceed the IEEE
802.3 standard cable specification. Digital recommends using ThinWire
cable (see Appendix A for the ThinWire cable evaluation procedure).

Verifying the Installation

2–5

Figure 2–3 and Figure 2–4 show configurations using ThinWire cabling. The configurations conform to the EIA/TIA-568 building wiring standard. The standard
states that the horizontal is limited to a maximum of 90 meters, including a maximum
of 3 meters in the work area, and a maximum of 6 meters for cross-connecting.
Figure 2–3:

ThinWire Standard Configuration

Maximum length = 96 m (315 ft)
Concentrator

In work
area

In equipment
room

3m
(9.8 ft)

90 m max
(295 ft)

3m
(9.8 ft)

Workstation

LKG-4970-91I

Figure 2–4:

ThinWire Cross-Connect Configuration

Maximum length = 99 m (325 ft)
Concentrator

In equipment
room

3m
(9.8 ft)

In work
area

90 m max
(295 ft)

3m
(9.8 ft)

Workstation

LKG-4969-91I

2–6

DECconcentrator 500 ThinWire and Shielded Twisted-Pair Option Card Installation

2.3.3 Shielded Twisted-Pair Cable Evaluation

Shielded twisted-pair cable must be installed and verified to conform to the IEEE
802.5 token ring network installation guidelines.
Refer to Appendix B for the shielded twisted-pair cable evaluation procedure.
NOTE
Shielded twisted-pair cableplant total loss at 62.5 MHz
must be less than 12dB.

The shielded twisted-pair cable must meet or exceed the requirements of the IEEE
802.5 token ring networks (refer to Appendix D for recommended cable types).
Figure 2–5 and Figure 2–6 show configurations using shielded twisted-pair cabling.
The configurations conform to the EIA/TIA-568 building wiring standard. The standard states that the horizontal is limited to a maximum of 90 meters, including a maximum of 3 meters in the work area, and a maximum of 6 meters for cross-connecting.
For additional cabling information, refer to the Network Wiring and Applications
Guide.
Figure 2–5:

Shielded Twisted-Pair Standard Configuration

Maximum length = 96 m (315 ft)

In work
area

In equipment
room

Concentrator
3m
(9.8 ft)

90 m max
(295 ft)

3m
(9.8 ft)

Workstation

LKG-5029-91I

Verifying the Installation

2–7

Figure 2–6:

Shielded Twisted-Pair Cross-Connect Configuration

Maximum length = 99 m (325 ft)

In work
area

In equipment
room

Concentrator
3m
(9.8 ft)

3m
(9.8 ft)

90 m max
(295 ft)

3m
(9.8 ft)

Workstation

LKG-5028-91I

2.4 Connecting Data Cables
Figure 2–7 shows the two types of data cables for the copper option cards.
Figure 2–7:

Types of Data Cables

ThinWire BNC connector
cable

Shielded twisted-pair
9-pin D-subminiature
connector cable

LKG–4990-91I

2–8

DECconcentrator 500 ThinWire and Shielded Twisted-Pair Option Card Installation

Steps 1 through 3 describe how to connect the data cables.
1. Connect the data cable to the appropriate port (see Figure 2–8 ).
Figure 2–8:

Connecting Data Cables

ThinWire

Shielded Twisted-Pair
LKG-4820-91I

Verifying the Installation

2–9

2. Observe the LEDs after you connect the data cables (see Figure 2–9).
If the LEDs for the copper-media ports do not indicate proper DECconcentrator 500
operation, refer to the problem-solving section of the DECconcentrator 500 Installation manual.
Figure 2–9:

LEDs – Fully Configured DECconcentrator 500

Network Management Card
Card
fault
LED

Port A
LED

Controller/
Backplane Fan Power
LED LED LED

Ring
operaPort B tional
LED
LED

DECconcentratorTM 500

= Loopback
connector
= OFF
= ON (Green only;
on solid)
= ON (Green only;
blinking)
= ON (Red only;
blinking)

Card Port 1
fault LED
LED

Port 2 Port 3
LED
LED

Port 4
LED

Port 5
LED

Port 6
LED

Port Cards
LKG-5048-91I

NOTE
Figure 2–9 assumes that all ports are connected to active
stations.

3. For each cable connected to the concentrator, add the cable identification
number to the DECconcentrator 500 Identification List in Appendix C.

2–10

DECconcentrator 500 ThinWire and Shielded Twisted-Pair Option Card Installation

A
ThinWire Cable Evaluation Procedure

This appendix contains the procedures to verify that the installed ThinWire cableplant discussed in Chapter 2 works in the FDDI network.
The cable configuration is verified with a time domain reflectometer (TDR). The
TDR detects discontinuities in the cable and measures the distance to the discontinuity. A discontinuity can be caused by a break, poor connection, incorrect termination,
or an improperly installed cable.
There are several Time Domain Reflectometers (TDR) available that can be used to
make the measurements. The following procedure uses the Tektronix Model 1503
TDR (Digital P/N FC-10079-AC).
NOTE
Digital part numbers are for use by Digital Service
representatives. Customers should order Tektronix
equipment from Tektronix or its representatives.

A.1 Test Procedure
Perform the test procedure by doing the following:
1. Turn on the power to the TDR.
2. Connect the 50-ohm terminator to the BNC input on the TDR.
3. Set the TDR to 50-ohm termination.
4. Set the IMPLS WIDTH to 10 ns (SHORT PULSE).

A-1

5. Set the the RET LOSS/SENSITIVITY controls to 0-dB.
6. Set the METERS/DIV control to 2.5.
7. Set the DISTANCE control to 0.
8. Adjust the 0-dB SET control to four divisions.
9. Adjust the ZERO REF SET so that the leading edge of the test pulse is on the
first vertical line from the left edge of the screen. The arrow in the bottom left
corner of the graticule shown in Figure A–1 indicates the reference line.
The display shows a pulse on the left half of the screen. Because there is no cable
connected to the TDR and therefore no discontinuities (the terminator is a 50-ohm
load), the pulse is followed by a horizontal line.
Figure A–1: TDR Test Pulse Display – Ideal Termination (Output Pulse Only)

4.0 DIV

LKG–5045–91I

A-2

ThinWire and Shielded Twisted-Pair Option Card Installation

NOTE

If the TDR is not calibrated for ThinWire cable, refer to Section A.2. Refer to the cable manufacturer’s specifications for the dielectric of the cable. A
typical value is 0.77.
10. Connect the cable to the BNC input on the TDR.
11. Adjust the DISTANCE dial until the return pulse is located on the reference
line. See Figure A–2.
The reading on the DISTANCE dial gives the length from the cable connector
to the discontinuity.
Figure A–2: TDR Test Pulse Display – Typical Reflection Signature (Output
Pulse and Reflection)

LKG–5046–91I

ThinWire Cable Evaluation Procedure

A-3

For cables longer than 70 meters or when you encounter an operational problem,
make and document a TDR measurement for distance, return loss, and discontinuity
reflections for each end of the cable. The following list shows the maximum values
allowed.

•

Measured distance:

100 m

•

Return loss:

11 dB

•

Discontinuity reflections:

–28 dB

•

Number of discontinuities:

Measure the return loss and discontinuity reflections by adjusting the RET LOSS/
SENSITIVITY control on the TDR until the amplitude of the return pulse matches
the amplitude of the input pulse (four divisions). The RET LOSS/SENSITIVITY
control setting is the return loss or discontinuity reflection value.
A.1.1 Evaluating the TDR Test

Remember the following points when evaluating a TDR test:

A-4

•

To measure the relative amplitude of the reflection produced by any discontinuity on the coaxial cable under test, compare the return pulse generated by
the discontinuity with the input (transmitted) pulse from the TDR. Conventionally, the relative difference is expressed in decibels (dB).

•

Typical dB values for the discontinuities are:
–

For most untapped cable, –30 dB or more down

–

For connectors, –28 dB or more down

–

For short circuit, –4 dB or less down

–

For open circuit, –4 dB or less down

ThinWire and Shielded Twisted-Pair Option Card Installation

A.2 Calibrating for Cable Dielectric
1. Measure a length of cable electrically equivalent to the installed cableplant.
2. Set the FEET(METERS)/DIV and multiplier selectors so the pulse and the
return pulse both appear on the screen.
3. Select the TEST PULSE to display two distinct pulse waveforms.
The first pulse is the test pulse; the second pulse is the reflection caused by
the open end of the cable. The length of the cable is measured from the leading edge of the first pulse to the leading edge of the second pulse.
4. Adjust the DISTANCE CAL controls as close as possible to the actual length
of the cable.
5. Use the ZERO REF CHECK and set the ZERO REF SET control to position
the leading edge of the test pulse to the center line of the screen.
6. Set the DISTANCE control to the number equal to the length of the cable.
The pulse from the end of the cable should be near the center line of the
screen.
7. Adjust the DISTANCE CAL to position the end pulse as close to the center as
possible.
8. Set the DISTANCE control to 0.
9. Use the ZERO REF CHECK and reset the leading edge of the test pulse to
the center of the screen.
10. Repeat steps 6 through 9 until the end pulse is as close to the center line as
possible.
The number selected with the DISTANCE CAL control is the cable dielectric
factor.

ThinWire Cable Evaluation Procedure

A-5

B
Shielded Twisted-Pair Cable
Evaluation Procedure

This appendix contains the procedures to verify that the installed shielded twistedpair (STP) cableplant discussed in Chapter 2 works in the FDDI network.
The procedure checks:

•

The length and loss characteristics with a Time Domain Reflectometer (TDR)

•

The continuity of the wire and the shield

•

Short circuits between the pairs of twisted wire in the cable and shorts to the
shield

The following equipment and reference are recommended for use in the test procedure:
NOTE
Digital part numbers are for use by Digital Service Representatives. Customers should order Tektronix equipment from Tektronix or its representatives.

•

Tektronix Model 1503 TDR (Digital P/N FC-10079-AC)

•

Tektronix 015-0600-00 Token Ring Interface (Digital P/N 29-29364-01)

•

Unmodified IBM 802.5 connector (Digital P/N 12-30269-01)

•

802.3/Ethernet Adapter for IBM Shielded Twisted-Pair Installation Guide
(P/N EK-STPIG-IN).

B–1

B.1 Test Set-Up
1. Turn on the power to the TDR.
2. Connect the Token Ring Interface (TRI) to the BNC input on the TDR.
3. Set the PHANTOM VOLTAGE switch on the TRI to the OFF position. This
switch is not used for FDDI installations.
4. Set the LOAD switch to the 150-ohm position.
5. Set the PAIR selection switch to REC.
6. Set the TDR to 125-ohm termination.
7. Set the IMPLS WIDTH switch on the TDR to 10 ns (SHORT PULSE).
8. Set the NOISE FILTER switch to ON.
9. Set the RET LOSS/SENSITIVITY controls to 0-dB.
10. Set the METERS/DIV control to 2.5.
11. Set the DISTANCE control to 0.
12. Adjust the 0-dB SET control for four divisions.
13. Adjust the ZERO REF SET control so that the leading edge of the test pulse
is on the first vertical line from the left of the screen. The arrow in the bottom
left corner of the graticule shown in Figure B–1 indicates the reference line.

B–2

DECconcentrator 500 ThinWire and Shielded Twisted-Pair Option Card Installation

The display shows a pulse on the left half of the screen. Because there is no cable
connected to the TDR and therefore no discontinuities (the terminator is a 150-ohm
load), the pulse is followed by a horizontal line. A small amount of ripple on the trace
is normal.
Figure B–1: TDR Pulse Display – Ideal Termination

4.0 DIV

LKG–5045–91I

Shielded Twisted-Pair Cable Evaluation Procedure

B–3

NOTE
If the TDR is not calibrated for STP cable, refer to Section B.4. Refer to the cable manufacturer’s specifications for the dielectric of the cable. A typical value is
0.77.

B.2 Testing for Length and Loss
1. Connect an unmodified IBM 802.5 connector at the far end of the cable. This
connector is used to prevent the data pairs from wrapping back through the
connector.
2. Set the LOAD switch on the TRI to the OPEN position.
3. Adjust the DISTANCE dial on the TDR until the return pulse appears on the
screen. See Figure B–2.
The reading on the DISTANCE dial is the length from the cable connector to the discontinuity.

B–4

DECconcentrator 500 ThinWire and Shielded Twisted-Pair Option Card Installation

Figure B–2: TDR Test Pulse Display – Typical Reflection Signature (Output
Pulse and Reflection)

LKG–5046–91I

4. Toggle the PAIR switch on the TRI between the REC and XMIT settings.
There should be very little change in the distance reading. If there is a major change, a
problem exists on the adjacent pair of shielded twisted-pair in the cable (short, open).
The maximum values allowed are as follows:

•

Measured distance:

100 m

•

Return loss:

14 dB

•

Discontinuity reflections:

–20 dB

Shielded Twisted-Pair Cable Evaluation Procedure

B–5

Remember the following points when evaluating a TDR test:

•

Increased accuracy is obtained when a measurement is made at both ends of
the cable.

•

To measure the relative amplitude of the reflection produced by any discontinuity on the cable under test, compare the return pulse generated by the discontinuity with the input (transmitted) pulse from the TDR. Conventionally,
the relative difference is expressed in decibels (dB).

•

Typical dB values for the discontinuities are:
–

For most untapped cable, –30 dB or more down

–

For connectors, –25 dB or more down

–

For short circuit, –8.5 dB or less down

–

For open circuit, –8.5 dB or less down

B.3 Testing for Continuity and Short Circuit
Refer to Chapter 2 of the 802.3/Ethernet Adapter for IBM Shielded Twisted-Pair Installation Guide for a description of continuity and short circuit tests.

B–6

DECconcentrator 500 ThinWire and Shielded Twisted-Pair Option Card Installation

B.4 Calibrating for Cable Dielectric
1. Measure the length of a cable electrically equivalent to the installed cableplant.
2. Connect one end of the cable to the IBM 802.5 connector.
3. Connect the other end of the cable to the TRI.
4. Set the FEET(METERS)/DIV and multiplier switches so the pulse and the
return pulse both appear on the screen.
5. Select the TEST PULSE to display 2 distinct pulse waveforms.
The first pulse is the test pulse; the second pulse is the reflection caused by
the open end of the cable. The length of the cable is measured from the leading edge of the first pulse to the leading edge of the second pulse.
6. Adjust the DISTANCE CAL controls as close as possible to the actual length
of the cable.
7. Use the ZERO REF CHECK and set the ZERO REF CHECK control to position the leading edge of the test pulse to the center line of the screen.
8. Set the DISTANCE control to the number equal to the length of the cable.
The pulse from the end of the cable should be near the center line of the
screen.
9. Adjust the DISTANCE CAL to position the end pulse as close as possible to
the center.
10. Set the DISTANCE control to 0.
11. Use the ZERO REF CHECK and reset the leading edge of the test pulse to
the center of the screen.
12. Repeat steps 8 through 11 until the end pulse is as close as possible to the
center line.
The number selected with the DISTANCE CAL control is the cable dielectric
factor.

Shielded Twisted-Pair Cable Evaluation Procedure

B–7

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 ThinWire and Shielded Twisted-Pair Option Card Installation

D
Vendors and Part Numbers

This appendix contains part descriptions, part numbers, and vendor names and addresses.

D.1 Shielded Twisted-Pair Patch Cables and Cable Types
Table D–1 lists the part number and vendor for patch cables. Table D–2 lists the part
numbers and vendor for cable types. Refer to the Anixter Brothers Catalog for IBM
Corporation cabling information.
Table D–1: Shielded Twisted-Pair Patch Cables
FDDI Option Cable

Digital
Part Number

Anixter Brothers
Part Number

DEFCN-SA (3 m approx)

BN20G-03

140082

Table D–2: Shielded Twisted-Pair Cable Types
Cable Types

Anixter Brothers
Part Number

IBM Corp.
Part Number

Type 1 (non-plenum)

317-036-2202-IBM

4716748

Type 1 (plenum)

325-023-2202-IBM

4716749

Type 2 (non-plenum)

318-037-2206-IBM

4716739

Type 2 (plenum)

315-023-2602-IBM

4716738

Type 6 (patch cable)

325-014-2206-IBM

4716743

D–1

D.2 ThinWire Patch Cables and Cable Types
Table D–3 lists the part numbers and vendor for patch cables. Table D–4 lists the part
numbers and vendors for cable types. For additional information, refer to the
DECconnect Wiring Components and Applications Catalog.
Table D–3: ThinWire Patch Cables
Patch Cable

Digital Part Number

0.6 m
3.05 m

BC16K-02
BC16K-10

Table D–4: ThinWire Cable Types
Cable types

Digital
Part Number

Belden
Part Number

303 m spool (plenum)

H8244-A

89907

303 m spool (non-plenum)

H8243-A

9907

D.3 ThinWire and Shielded Twisted-Pair Loopback Connectors
Table D–5 lists the part numbers for loopback connectors.
Table D–5: Loopback Connectors

D–2

Loopback Connector

Digital
Part Number

ThinWire BNC loopback

H8614

Shielded Twisted-Pair D-subminiature loopback

H8616

DECconcentrator 500 ThinWire and Shielded Twisted-Pair Option Card Installation

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

IBM Direct System Products Department
One Colver Road
Dafton, NJ 08810

Belden Wire and Cable
P.O Box 1980
Richmond, IN 47375 (317)983-5200

Anixter Brothers
4711 Golf Road
Skokie, IL 60076
Boston Office

Vendors and Part Numbers

(708) 677-2600
(617) 682-8870

D–3

E
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.

E–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.

E–2

DECconcentrator 500 ThinWire and Shielded Twisted-Pair 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.

•

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