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EK-DECBR-OM-A01

April 1993

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Document:	DECbrouter 90T Installation and Operating Information
Order Number:	EK-DECBR-OM
Revision:	A01
Pages:	62
Original Filename:

OCR Text

DECbrouter 90T
Installation and Operating Information
Order Number: EK–DECBR–OM. A01

First Edition, April 1993
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.
The software described in this document is furnished under a license and may be used or copied
only in accordance with the terms of such license.
No responsibility is assumed for the use or reliability of software on equipment that is not
supplied by Digital Equipment Corporation or its affiliated companies.
Restricted Rights: Use, duplication, or disclosure by the U.S. Government is subject to
restrictions as set forth in subparagraph (c) (1) (ii) of the Rights in Technical Data and
Computer Software clause at DFARS 252.227-7013.
FCC NOTICE: The equipment described in this manual 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 the user at his own expense may be required to take measures to
correct the interference.
© Digital Equipment Corporation 1993.
All Rights Reserved.
The following are trademarks of Digital Equipment Corporation: DEC, DECbridge, DECbrouter,
DECconnect, DECrouter, DECstation, DEC EtherWORKS, HUBwatch, ThinWire, and the Digital
logo.
All other trademarks and registered trademarks are the property of their respective holders.

This document was prepared using VAX DOCUMENT, Version 2.1.

Contents
Preface . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

vii

1 Overview
Features . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
DECbrouter 90T1 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
DECbrouter 90T2 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
DECbrouter 90T2A . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Typical Configurations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
LEDs and Connectors . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

1–1
1–2
1–2
1–3
1–5
1–8
1–9

2 Installation
Standalone Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Select a location. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Place the DECbrouter 90 on a table. . . . . . . . . . . . . . . . . . . . . . . . . .
Mount the DECbrouter 90 on a wall. . . . . . . . . . . . . . . . . . . . . . . . . .
Mount the DECbrouter 90 on a wall. . . . . . . . . . . . . . . . . . . . . . . . . .
Connect the cables. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Install and verify devices. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Backplane Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Remove the back cover. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Mount the DECbrouter 90 in the backplane. . . . . . . . . . . . . . . . . . . .
Install and verify devices. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

2–1
2–1
2–1
2–2
2–2
2–4
2–9
2–10
2–10
2–10
2–12

iii

3 Troubleshooting
Before You Start . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
DECbrouter 90 Standalone Troubleshooting . . . . . . . . . . . . . . . . . . . . . .
DECbrouter 90 Backplane Configuration Troubleshooting . . . . . . . . . . . .

3–1
3–1
3–3

A Specifications and Parts List
Physical Dimensions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Environmental Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Operating Environment . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Shipping Environment . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Electrical Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Power Supply . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Power Input . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Parts List . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

A–1
A–1
A–2
A–2
A–2
A–3
A–3
A–4

B Related Documentation
C DECbrouter 90 Installation Information for the United
Kingdom
Service Categories . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Host Power Rating . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Module Isolation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Safety Status . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Cable Approval . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Supported Cables . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Equipment Between the Approved Module and a Digital Circuit
(PTT) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

C–1
C–2
C–3
C–3
C–3
C–3
C–4

Index
Figures
1–1
1–2
1–3
2–1
2–2

Typical DECbrouter 90T1 Connection . . . . . . . . . . . . . . . . . .
Typical DECbrouter 90T2 or DECbrouter 90T2A
Connection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
DECbrouter 90 LEDs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Removing the Back Cover . . . . . . . . . . . . . . . . . . . . . . . . . . .
Mounting the DECbrouter 90 . . . . . . . . . . . . . . . . . . . . . . . . .

1–6
1–7
1–9
2–2
2–3

2–3
2–4
2–5
2–6
2–7
2–8

DECbrouter 90T1 with a Twisted Pair (10BASET)
Connection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
DECbrouter 90T1 with a ThinWire (10Base2) Connection . . .
DECbrouter 90T2 or DECbrouter 90T2A with a Twisted Pair
(10BASET) Connection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
DECbrouter 90T2 or DECbrouter 90T2A with a ThinWire
(10Base2) Connection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Removing the Back Cover . . . . . . . . . . . . . . . . . . . . . . . . . . .
Mounting the DECbrouter 90 . . . . . . . . . . . . . . . . . . . . . . . . .

2–5
2–6
2–7
2–8
2–10
2–11

Tables
1–1
1–2
3–1
3–2
A–1
A–2
A–3
A–4
A–5
A–6
A–7
C–1
C–2
C–3

DECbrouter 90 Features . . . . . . . . . . . . . . . . . . . . . . . . . . . .
DECbrouter 90 LEDs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Troubleshooting a DECbrouter 90 Standalone Unit . . . . . . . .
Troubleshooting a DECbrouter 90 in a DEChub 90
Backplane . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
X.21 Cable Connections (BC12F-06, 17-03580-01) . . . . . . . . .
RS422 Cable Connections (BC12H-06, 17-03767-01) . . . . . . .
V.35 Connection BC12G-06, 17-03766-01 . . . . . . . . . . . . . . . .
RS530A Cable Connections BC12J-06, 17-03760-01 . . . . . . . .
RS423 Cable Connections BC12K-06, 17-03761-01 . . . . . . . . .
V.28/RS232 Cable Connections BC12L-06, 17-03762-01 . . . . .
Cable Connections for Console Converter . . . . . . . . . . . . . . . .
BABT-Approved Service Specifications . . . . . . . . . . . . . . . . . .
Module Power . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Cables Supported by the Approved Module . . . . . . . . . . . . . .

1–4
1–10
3–1
3–3
A–5
A–6
A–8
A–9
A–11
A–13
A–15
C–2
C–2
C–3

Preface
This manual describes how to install and maintain the Digital Wide Area
Router/Bridge—the DECbrouter 90. This manual contains information on the
following three models:
•

DECbrouter 90T1—single port

•

DECbrouter 90T2—dual port

•

DECbrouter 90T2A—dual port

The DECbrouter 90 is designed to work either as a standalone unit or in the
DEChub 90 backplane.

Organization
This manual contains three chapters and three appendices.
•

Chapter 1 provides an overview of the DECbrouter 90 and describes the
features of the DECbrouter 90.

•

Chapter 2 provides instructions for installing the Digital Wide Area
Router/Bridge.

•

Chapter 3 provides basic troubleshooting information.

•

Appendix A provides product specifications and a parts list.

•

Appendix B lists related documents that can help you become more familiar
with your new system.

•

Appendix C contains installation information, which is required for the
United Kingdom only.

vii

Conventions
This manual uses the following conventions:
Convention

Meaning

Note

Provides general information about the current topic.
A number in a black circle in text refers to the corresponding
number in an accompanying illustration.

viii

1
Overview
This chapter describes the features of the DECbrouter 90, shows several
typical configurations, summarizes the installation procedures for the
DECbrouter 90, and describes the DECbrouter 90 LEDs and connectors.
The DECbrouter 90 family consists of three models:
•

DECbrouter 90T1

•

DECbrouter 90T2

•

DECbrouter 90T2A

Features
The DECbrouter 90 provides the following features:
•

Choice of Ethernet in either ThinWire (10Base2) or twisted pair (10BASET)

•

Choice of serial port configurations:1
EIA530A2
RS232/V.28
RS449/RS422/V.112
RS449/RS423/V.102
V.353
V.362
X.21 Leased Lines (LL)

•

Console port

•

Installable on a DEChub 90 backplane

1
2
3

One serial port for DECbrouter 90T1 and two for either DECbrouter 90T2 or
DECbrouter 90T2A models.
Not available for DECbrouter 90T2.
Not available for DECbrouter 90T2A.

Overview 1–1

Overview
Features
•

Simple Network Management Protocol (SNMP) through HUBwatch or
other network management system

Table 1–1 summarizes the features for each model of the DECbrouter 90.

DECbrouter 90T1
The DECbrouter 90T1 is a Digital Wide Area Router/Bridge consisting of
two interfaces and one console port. The interfaces consist of one Ethernet
interface and one synchronous serial port. The Ethernet interface is either a
ThinWire port (10Base2) or a twisted pair port (10BASET) exclusively. The
synchronous serial port supports one of the following seven standards as
determined by the cable attached to the serial port:
•

EIA530A

•

RS232/V.28

•

RS449/RS422/V.11

•

RS449/RS423/V.10

•

V.35

•

V.36

•

X.21 Leased Lines

The console port consists of an asynchronous RS232 serial port.

DECbrouter 90T2
The DECbrouter 90T2 is a Digital Wide Area Router/Bridge consisting of
three interfaces and one console port. The interfaces consist of one Ethernet
interface and two synchronous serial ports. The Ethernet interface is either
a ThinWire (10Base2) port or a twisted pair (10BASET) port exclusively. The
synchronous serial ports support any two of the following three standards,
in any combination, as determined by the cable attached to the synchronous
serial port:
•

RS232/V.28

•

V.35

•

X.21 Leased Lines

The console port consists of an asynchronous RS232 serial port.

1–2 Overview

Overview
Features

DECbrouter 90T2A
The DECbrouter 90T2A is a Digital Wide Area Router/Bridge consisting of
three interfaces and one console port. The interfaces consist of one Ethernet
interface and two synchronous serial ports. The Ethernet interface is either
a ThinWire (10Base2) port or a twisted pair (10BASET) port exclusively. The
synchronous serial port supports any two of the following six standards, in any
combination, as determined by the cable attached to the synchronous serial
port:
•

EIA530A

•

RS232/V.28

•

RS449/RS422/V.11

•

RS449/RS423/V.10

•

V.36

•

X.21

The console port consists of an asynchronous RS232 serial port.

Overview 1–3

Overview
Features
Table 1–1 summarizes the features of the DECbrouter 90 models.
Table 1–1 DECbrouter 90 Features
Features by Model Number
Interface/Console
Supported

90T1

90T2

90T2A

Interfaces

Ethernet1

Synchronous Serial2

EIA530A

–

RS232/V.28

RS449/RS422/V.11

–

RS449/RS423
/V.10

–

V.35

–

V.36

–

X.21 Leased Lines

Console

1 Choice of either Twisted Pair (10BASET) or ThinWire (10Base2).
2 Each serial port can use one of the signal configurations indicated by an "X".

1–4 Overview

Overview
Typical Configurations

Typical Configurations
The DECbrouter 90 can operate in either a standalone configuration or
installed in Digital’s DEChub 90 Ethernet backplane. Figure 1–1 shows
a typical configuration of the DECbrouter 90T1 in an Ethernet local area
network (LAN).
If you use the DECbrouter 90 as a standalone unit, then it operates without
using the DEChub 90 and uses a separate power supply. The modular power
supply connects to a 7-pin connector on the DECbrouter 90 and includes an
auto-ranging power supply and appropriate power cord for use with either 120
Volt or 240 Volt power outlets.

Overview 1–5

Overview
Typical Configurations
Figure 1–1 Typical DECbrouter 90T1 Connection
LAN1

Ethernet ThinWire
DECrouter 250

Modem

Telephone
Lines

Modem

V.35

Modem

EIA530
DECbrouter 90T1

DECbrouter 90T1
DECbrouter 90T1

DECbrouter 90T1

LAN2

LAN3

Ethernet ThinWire

Ethernet ThinWire
LJ-02754-TI0

1–6 Overview

Overview
Typical Configurations
Figure 1–2 shows a typical configuration of either the DECbrouter 90T2 or
DECbrouter 90T2A in an Ethernet LAN.
Figure 1–2 Typical DECbrouter 90T2 or DECbrouter 90T2A Connection
LAN1

Ethernet ThinWire

LAN2

Ethernet ThinWire

DECstation
Router

Modem

X.21
Network

Host

Modem

Telephone
Lines

Modem

V.35

Modem

DECbrouter 90T2A
DECbrouter 90T2

X.21

RS449

LAN3
Ethernet ThinWire

DECbrouter 90T2 A

DECbrouter 90T2

RS232

LAN4
Ethernet ThinWire
LJ-02755-TI0

Overview 1–7

Overview
Installation

Installation
The DECbrouter 90 is easy to install and use. After unpacking the DECbrouter
90:
1. Plug the connector from the power supply into your DECbrouter 90.
Connect one end of the power cord into the power supply and the other end
into a working ac power outlet.
2. Connect the DECbrouter 90 to either a properly terminated ThinWire
(10Base2) or to a twisted pair (10BASET) Ethernet device, but do not
connect to both.
3. Connect the synchronous serial ports using the cables for the various types
of connections. Refer to Appendix A, Tables A–1 through A–6, for a listing
of the different types of cables and the various connections.
4. Connect a console device to the console port.
The port status LEDs for unconnected ports should turn off when network
traffic is established.
For more detailed information on configuring the DECbrouter 90, see the
DECbrouter 90 Products Configuration and Reference - Volume 1, DECbrouter
90 Products Configuration and Reference - Volume 2, and DECbrouter 90
Products Configuration and Reference - Volume 3 manuals. For more detailed
information on installing and using the DECbrouter 90, see Chapter 2.

1–8 Overview

Overview
LEDs and Connectors

LEDs and Connectors
Figure 1–3 shows the DECbrouter 90 LEDS and Table 1–2 describes the LEDs
and connectors.
Figure 1–3 DECbrouter 90 LEDs

1
2

13
DECbrouter 90T2

DECbrouter 90T1

14
11

LJ-02747-TI0.DG

Overview 1–9

Overview
LEDs and Connectors
Table 1–2 DECbrouter 90 LEDs
Power indicator—Monitors the status of the +5.0 Vdc
voltage. On: The +5.0 Vdc voltage is normal.
Off: The voltage is abnormal (as in a power failure).
Network activity indicator—Monitors the network
activity.
On: There is network activity.
Off: There is no network activity.
Port 0 status indicator—Monitors the status of either
the ThinWire (10Base2) or the twisted pair (10BASET)
input to the DECbrouter 90.
On: Port 0 is functional.
Off: Port 0 has failed or has been partitioned.

Port 0 activity status indicator–Monitors the
activity of the Ethernet port.
On: The port is transmitting or receiving data.
Off: The port is not transmitting or receiving data.

Twisted Pair (10BASET) connector–Connects the
DECbrouter 90 to a 10BASET twisted pair. Not used
when the DECbrouter 90 is installed in the DEChub 90
backplane.

Port 1 serial line status indicators–Monitors the
activity of port one.
On: Port 1 is transmitting or receiving data.
Off: Port 1 is not currently transmitting or receiving
data.
(continued on next page)

1–10 Overview

Overview
LEDs and Connectors
Table 1–2 (Cont.) DECbrouter 90 LEDs
Synchronous serial port 1 connection–This port
supports the following standards:

•

EIA530A1

•

RS232/V.28

•

RS449/RS422/V.111

•

RS449/RS423/V.101

•

V.352

•

V.361

•

X.21 leased lines

Console port connection–This port connects a
console terminal, used for managing the DECbrouter
90. The console port is an RS232, which uses a DB9
connector.

Port 0 network connector (BNC)–Connects the
DECbrouter 90 to the work group ThinWire segment.
Not used when the DECbrouter 90 is either installed
in the DEChub 90 backplane or connected through the
twisted pair (10BASET) connector.
Backplane connector–Provides Port 0 network
and power connections to the DECbrouter 90 when
the DECbrouter 90 is installed in the DEChub 90
backplane.
Power connector–Provides +5.0 volts from the
DECbrouter 90 power supply. Not used when the
DECbrouter 90 is installed in the DEChub 90
backplane.
Back cover–Comes with standalone units only. Covers
the backplane connector and contains a wall-mounting
assembly.
Port 2 serial line status indicators–Monitors the
activity of port two.
On: Port 2 is transmitting or receiving data.
Off: Port 2 is not transmitting or receiving data.

1 Not available on DECbrouter 90T2.

2 Not available on DECbrouter 90T2A.

(continued on next page)

Overview 1–11

Overview
LEDs and Connectors
Table 1–2 (Cont.) DECbrouter 90 LEDs

Synchronous serial port 2 connection–This
connection supports one of the following standards:
•

EIA530A1

•

RS232/V.28/V.24

•

RS449/RS422/V.111

•

RS449/RS423/V.101

•

V.352

•

V.361

•

X.21 leased lines

1 Not available on DECbrouter 90T2.
2 Not available on DECbrouter 90T2A.

1–12 Overview

2
Installation
This chapter describes how to install the DECbrouter 90 either as a standalone
unit or in a DEChub 90 Ethernet backplane. You can install a standalone unit
either on a table or wall.
To install the DECbrouter 90 on a table or wall, see the ‘‘Standalone
Installation’’ section.
To install the DECbrouter 90 in a DEChub 90 Ethernet backplane, see the
‘‘Backplane Installation’’ section.

Standalone Installation
To install the DECbrouter 90 as a standalone unit either on a table or wall,
perform the following procedures:

Select a location.
The location should be accessible to a power outlet that supplies the correct
voltage.

Place the DECbrouter 90 on a table.
When you place the DECbrouter 90 on a table top, follow the environmental
specifications in Appendix A.

Installation 2–1

Installation
Standalone Installation

Mount the DECbrouter 90 on a wall.
Remove the back cover of the DECbrouter 90 (if necessary).
1. Insert a small screwdriver into the top mounting hole on the cover.
2. Lift the internal latch with the screwdriver, then pull the cover away and
down from the top of the DECbrouter 90 as shown in Figure 2–1.
Figure 2–1 Removing the Back Cover

LJ-00320-TI0

Mount the DECbrouter 90 on a wall.
1. Use the mounting holes on the cover to determine the position of the
mounting screws on the wall as shown in Figure 2–2.
2. Secure the back cover to the wall using the mounting screws.
The screws should be tight enough to provide some resistance if you try to
remove the back cover from the wall. Do not tighten the screws so much
that the cover is distorted or cannot be removed from the wall.

2–2 Installation

Installation
Standalone Installation
3. Remove the back cover from the wall.
Figure 2–2 Mounting the DECbrouter 90

LJ-00701-TI0

4. Attach the back cover to the DECbrouter 90.
5. Mount the DECbrouter 90 onto the mounting screws.

Installation 2–3

Installation
Standalone Installation

Connect the cables.
Refer to the appropriate figure listed in the following table based on the type of
connection you need for your DECbrouter 90:
Type Connection

Figure

DECbrouter 90T1 with a Twisted Pair (10BASET) Connection

2–3

DECbrouter 90T1 with a ThinWire (10Base2) Connection

2–4

DECbrouter 90T2 or DECbrouter 90T2A with a Twisted Pair
(10BASET) Connection

2–5

DECbrouter 90T2 or DECbrouter 90T2A with a ThinWire
(10Base2) Connection

2–6

To connect the cables, refer to the appropriate figure as listed above and
perform the following:
1. Connect the cable from the power supply to the 7-pin power connector on
the DECbrouter 90. Align the power symbol on the dc power connector
with the power symbol on the DECbrouter 90 and push the connector
straight in.
2. Connect the DECbrouter 90 power supply to the power source.
a. Place one end of the power cord into the connector located on the power
supply.
b. Plug the other end of the power supply cord into the wall outlet.
3. Connect either the Ethernet ThinWire T-connector to the port 0 BNC
network connector or the 10BASET connector to the twisted pair connector.
If you are connecting to a ThinWire, then terminate the connection with a
50-ohm terminator or extend the Ethernet segment to the next device.
Note
Connection should never be made to both the ThinWire (10Base2) and
twisted pair (10BASET) connectors simultaneously.

4. The port 0 status activity LED should be on or flashing to indicate the
amount of network traffic. The LED intensity varies.
5. Connect the serial cables to port 1 for DECbrouter 90T1 and to ports 1 and
2 for DECbrouter 90T2 and DECbrouter 90T2A.

2–4 Installation

Installation
Standalone Installation
6. Connect the console using an RS232 DB9 connector.
Figure 2–3 shows the DECbrouter 90T1 with a twisted pair connection.
Figure 2–3 DECbrouter 90T1 with a Twisted Pair (10BASET) Connection

DECbrouter 90T1

Twisted
Pair

EIA 530A
RS232/V.28
RS449/RS422/V.11
RS449/RS423/V.10
V.35
V.36
X.21 (LL)
LJ-02750-TI0

Installation 2–5

Installation
Standalone Installation
Figure 2–4 shows the DECbrouter 90T1 with a ThinWire connection.
Figure 2–4 DECbrouter 90T1 with a ThinWire (10Base2) Connection

ThinWire

DECbrouter 90T1

EIA 530A
RS232/V.28
RS449/RS422/V.11
RS449/RS423/V.10
V.35
V.36
X.21 (LL)
LJ-02751-TI0

2–6 Installation

Installation
Standalone Installation
Figure 2–5 shows the DECbrouter 90T2 or DECbrouter 90T2A with a twisted
pair connection.
Figure 2–5 DECbrouter 90T2 or DECbrouter 90T2A with a Twisted Pair
(10BASET) Connection

DECbrouter 90T2

Twisted
Pair

EIA 530A
RS232/V.28
1
RS449/RS422/V.11
1
RS449/RS423/V.10
V.35 2
V.36 1
X.21 (LL)
LJ-02757-TI0

1
2

Not available on the DECbrouter 90T2.
Not available on the DECbrouter 90T2A.

Installation 2–7

Installation
Standalone Installation
Figure 2–6 shows the DECbrouter 90T2 or DECbrouter 90T2A with a ThinWire
connection.
Figure 2–6 DECbrouter 90T2 or DECbrouter 90T2A with a ThinWire
(10Base2) Connection

ThinWire

DECbrouter 90T2

EIA 530A
RS232/V.28
1
RS449/RS422/V.11
1
RS449/RS423/V.10
2
V.35
V.36 1
X.21 (LL)

LJ-02756-TI0

1
2

Not available on the DECbrouter 90T2.
Not available on the DECbrouter 90T2A.

2–8 Installation

Installation
Standalone Installation

Install and verify devices.
1. Connect the devices to ports 1 and 2.
A port LED should turn on if the port is correctly connected and when the
device receives its first network activity.
2. Verify the operation of each device by sending information to the port being
tested.
You have now installed the DECbrouter 90.

Installation 2–9

Installation
Backplane Installation

Backplane Installation
To install the DECbrouter 90 in the DEChub 90 Ethernet backplane, perform
the following procedures:

Remove the back cover.
Remove the back cover, if one is present.
1. Insert a small screwdriver into the top mounting hole on the cover.
2. Lift the internal latch with the screwdriver, then pull the cover away and
down from the top of the DECbrouter 90 as shown in Figure 2–7.
Figure 2–7 Removing the Back Cover

LJ-00320-TI0

Mount the DECbrouter 90 in the backplane.
1. Install the DECbrouter 90 in the backplane as shown in Figure 2–8. Place
the lower mounting tab on the back of the DECbrouter 90, in the correct
mounting slot on the backplane.

2–10 Installation

Installation
Backplane Installation
2. Rock the DECbrouter 90 into place. You will hear an audible click when
the DECbrouter 90 is securely latched in place.
Figure 2–8 Mounting the DECbrouter 90

DECbrouter 90T1

LJ-02748-TI0

Note
You can install or remove the DECbrouter 90 from the DEChub 90
Ethernet backplane while the backplane power is still on (hot swap).

Installation 2–11

Installation
Backplane Installation
3. If this is a new installation, then turn on power to the backplane.
4. The port 0 status LED and the synchronous serial port on the DECbrouter
90 light up with intensity proportional to the amount of activity on the
indicated port.
5. Connect the console using an RS232 DB9 connector.

Install and verify devices.
1. Connect serial ports 1 and 2 using the proper cables for the signals desired.
The corresponding port LEDs should turn on when activity occurs.
2. Verify the operation of each device you plan to use by connecting and
sending information to each connected port.
You have now installed the DECbrouter 90.

2–12 Installation

3
Troubleshooting
This chapter provides troubleshooting information for the DECbrouter 90 when
used as a standalone unit or when installed in the DEChub 90 backplane.

Before You Start
1. Verify the installation of the repeater.
2. Note the fault condition.
3. Isolate the problem.
Use Table 3–1 to troubleshoot a standalone DECbrouter 90. Use Table 3–2
to troubleshoot a DECbrouter 90 installed in a DEChub 90 configuration.

DECbrouter 90 Standalone Troubleshooting
Use Table 3–1 to troubleshoot a standalone DECbrouter 90.
Table 3–1 Troubleshooting a DECbrouter 90 Standalone Unit
If...

Then...

Do this...

All LEDs are off

There is a problem with
the ac power connection.

Check that the ac power supply
is properly plugged into the
power outlet. Check the power
to the power outlet.
Check the 7-pin connector to the
power supply. If the connections
are fine, then replace both the
power supply cord and power
supply.
(continued on next page)

Troubleshooting 3–1

Troubleshooting
DECbrouter 90 Standalone Troubleshooting
Table 3–1 (Cont.) Troubleshooting a DECbrouter 90 Standalone Unit
If...

Then...

Do this...

The network activity
LED is off

There is low network
activity or no network
activity.

Ensure that network activity is
present. If the network activity
LED still fails to turn on, then
turn the unit off and on by
unplugging and replugging the
power supply.
Check that the network activity
LED turns on momentarily.

The serial port status
LED is off

3–2 Troubleshooting

If the network
activity LED turns on
momentarily, then the
network activity LED
portion of testing has
passed. If the network
LED still fails to turn
on, then the DECbrouter
90 is defective.

Replace the DECbrouter 90.

Ensure that the cable
has activity on it. If
the LED still fails to
turn on, then the port is
defective.

Switch ports on either
a DECbrouter 90T2 or
DECbrouter 90T2A and replace
the defective DECbrouter 90T1
with a working DECbrouter
90T1.

Troubleshooting
DECbrouter 90 Backplane Configuration Troubleshooting

DECbrouter 90 Backplane Configuration Troubleshooting
Use Table 3–2 to troubleshoot a DECbrouter 90 installed in a DEChub 90
configuration.
Table 3–2 Troubleshooting a DECbrouter 90 in a DEChub 90 Backplane
If...

Then...

Do this...

The power LED is off

The DECbrouter 90 is
not receiving +5.0 V.

Check the power LED on the
DEChub 90 power supply.

If the power LED on the
DEChub 90 is off, then
there is a problem with
the DEChub 90 power
supply.

See the troubleshooting
procedures in the DEChub
90 Ethernet Backplane Owner’s
Manual.

If the DEChub 90
power LED is on and
the other power LED
components are on, then
the DECbrouter 90 has
a power problem.

Reseat the DECbrouter 90 in
either the same slot or another
slot.

If the power LED on
the DEChub 90 power
supply is on and the
other power LED
components are off,
then the DEChub 90 has
a power problem.

See the troubleshooting
procedures in the DEChub
90 Ethernet Backplane Owner’s
Manual.

If the power LED turns
on when reseated in
the same slot, then the
DECbrouter 90 was not
properly seated.

Make sure the DECbrouter 90 is
properly seated in the slot.

If the power LED turns
on when reseated in
another slot, then the
problem is with the
DEChub 90.

See the troubleshooting
procedures in the DEChub
90 Ethernet Backplane Owner’s
Manual.
(continued on next page)

Troubleshooting 3–3

Troubleshooting
DECbrouter 90 Backplane Configuration Troubleshooting
Table 3–2 (Cont.) Troubleshooting a DECbrouter 90 in a DEChub 90
Backplane
If...

The port 0 network
activity LED is off

3–4 Troubleshooting

Then...

Do this...

If the DECbrouter 90
does not turn on in a
known good slot, then
the DECbrouter 90 is
defective.

Replace the DECbrouter 90.

The DECbrouter 90 or
any other unit in the
DEChub 90 may not be
connected to an active
segment.

Connect a known active segment
to any unit in the DEChub 90.

If the DECbrouter 90 is
connected to a known
active segment and the
port 0 LED is off, then
the DECbrouter 90 is
defective.

Replace the DECbrouter 90.

A
Specifications and Parts List
This appendix provides the following specifications for the DECbrouter 90:
•

Physical dimensions

•

Environmental specifications

•

Electrical specifications

This appendix also contains a parts list and the proper cable connections for
the X.21, RS422, V.35, RS530A, RS423, and V.24/RS232 standards.

Physical Dimensions
The following table describes the physical dimensions of the DECbrouter 90.
Dimension

Measurement

Height

3.5 cm ( 1.4 in)

Width

28.0 cm ( 11.0 in)

Depth

14.0 cm ( 5.5 in)

Weight

0.77 kg ( 1.7 lb)

Environmental Specifications
The DECbrouter 90 is designed to operate in an office environment or
equipment room environment such as telephone closets or satellite equipment
rooms. It is not intended to operate in an air plenum.

Specifications and Parts List A–1

Specifications and Parts List
Environmental Specifications

Operating Environment
The following table describes the operating environment specifications for the
DECbrouter 90.
Condition

Value

Temperature

5°C to 50°C (41°F to 122°F)

Maximum rate of change

20°C/hr (36°F/hr)

Relative humidity

10% to 95% (non-condensing)

Wet-bulb temperature

32°C ( 90°F) maximum

Dew point

2°C (36°F) minimum

Altitude

Sea level to 2.4 km (8000 ft)

Air flow

Convectively cooled. A minimum of 10 cm (4 in) of space
must be provided on both ends of the DECbrouter for
adequate air flow.

Shipping Environment
The following table describes the shipping environment specifications for the
DECbrouter 90.
Condition

Value

Temperature

-40°C to 66°C (-40°F to 151°F)

Relative humidity

10% to 95% (non-condensing)

Altitude

Sea level to 4.9 km (16,000 ft)

Electrical Specifications
The DECbrouter 90 features a self-contained power supply and power cord
option.

A–2 Specifications and Parts List

Specifications and Parts List
Electrical Specifications

Power Supply
The following table describes the power supply specifications for the
DECbrouter 90.
Specification

Value

Voltage (domestic)

104 Vac to 128 Vac ( nominal 120 Vac)

Voltage (international)

208 Vac to 256 Vac (nominal 240 Vac)

AC cord length

6 feet

Current at 120 volts

.25 amps

Current at 240 volts

.125 amps

Frequency

50 Hz to 60 Hz

Power consumption

9 watts

Output voltage

5.1 Vdc

DC cord length

8 feet

Output current

1.8 A

Power Input
The following table describes the power input specifications for the DECbrouter
90.
Specification

Value

Input voltage

4.75 Vdc to 5.25 Vdc

Input current

1.8 amp

Specifications and Parts List A–3

Specifications and Parts List
Parts List

Parts List
The following table provides a parts list for the DECbrouter 90.
Replacement Part

Part Number

DECbrouter 90T1

DEWB1

DECbrouter 90T2

DEWBR

DECbrouter 90T2A

DEWB2

Power supply, Universal

H7827-BA

Power cord, term, 110 Vac

17-00083-39

Power cord, 220 Vac
Pwr cord, term 3.100MM 250V 2.5M
Pwr cord, term 3-1.0 MM
Pwr cord,term 3-1.0 MM
Pwr cord, term 3-1.0 MM 10A
Pwr cord, term STR
Pwr cord, term 3-1.0 MM 10A

17-00199-21
17-00364-18
17-00210-13
17-00457-16
17-00198-14
17-00456-14

Cable, EIA530A

BC12J-06, 17-03760-01

Cable, RS232/V.28

BC12L-06, 17-03762-01

Cable, RS449/RS422/V.11

BC12H-06, 17-03767-01

Cable, RS449/RS423/V.10

BC12K-06, 17-03761-01

Cable, V.35

BC12G-06, 17-03766-01

Cable, X.21 (LL)

BC12F-06, 17-03580-01

A–4 Specifications and Parts List

Specifications and Parts List
Parts List
Table A–1 describes the cable connections for the X.21 standard.
Table A–1 X.21 Cable Connections (BC12F-06, 17-03580-01)
From
Pin
Connector (P1)

To X.21
Pin
Connector (P2)

Signal Name

1, 2, 26

–

Code Ground

5
30

2
9

T(A) TX Data A
T(B)TX Data B1

6
31

5
12

I(A) DCD A
I(B) DCD B2

8
33

3
10

C(A) RTS A
C(B) RTS B

10
35

4
11

R(A) RX Data A
R(B) RX Data B2

17
42

6
13

S(A) TX Clock A
S(B) TX Clock B2

13, 15

–

RX Clock A
DTE Clock A1

38, 40

–

RX Clock B
DTE Clock B 1

G DTE Ground

1 Contacts tied together.
2 120 OHM resistor, 1/2W between pins 6 and 31, 10 and 35, 17 and 42. The resistors are located
at P1 end of cable.

Specifications and Parts List A–5

Specifications and Parts List
Parts List
Table A–2 describes the cable connections for the RS422 standard.
Table A–2 RS422 Cable Connections (BC12H-06, 17-03767-01)
From
Pin
Connector (P1)

To RS422
Pin
Connector (P2)
Signal Name

1, 27

–

Code Ground1

4
29

11
29

DSR A
DSR B

5
30

4
22

TX Data A
TX Data B

6
31

13
31

DCD/I A
DCD/I B

8
33

7
25

RTS/C A
RTS/C B

9
34

9
27

CTS A
CTS B

10
35

6
24

RX Data A
RX Data B2

Ring Indicate

DCE Ground

1
38

8
26

RX Clock A
RX Clock B2

1 Contacts tied together.
2 120 OHM resistor, 1/2w between pins 10 and 35, 13 and 38, 17 and 42. The resistors are located
at P1 end of cable.

(continued on next page)

A–6 Specifications and Parts List

Specifications and Parts List
Parts List
Table A–2 (Cont.) RS422 Cable Connections (BC12H-06, 17-03767-01)
From
Pin
Connector (P1)

To RS422
Pin
Connector (P2)
Signal Name

14
39

12
30

DTR A
DTR B

15
40

17
35

Clock A
Clock B

1
42

5
23

TX Clock A
TX Clock B2

Test Indicate

19, 37

DTE Ground1

Local Loop

Speed Select

Remote Loop

Shell

Shield braid

1 Contacts tied together.
2 120 OHM resistor, 1/2w between pins 10 and 35, 13 and 38, 17 and 42. The resistors are located
at P1 end of cable.

Specifications and Parts List A–7

Specifications and Parts List
Parts List
Table A–3 describes the cable connections for the V.35 standard.
Table A–3 V.35 Connection BC12G-06, 17-03766-01
From
Pin
Connector (P1)

To V.35
Pin
Connector (P2)

Signal Name

1, 26

–

Code Ground 1

DSR A

DCD/I A

CTS A

Ring Indicate

21
46

Y
A

TX Clock A
TX Clock B

22
47

U
W

CK A
Clock B

23
48

R
T

RX Data A
RX Data B

24
49

P
S

TX Data A
TX Data B

25
50

V
X

RX Clock A
RX Clock B

RTS

1 Contacts tied together.

(continued on next page)

A–8 Specifications and Parts List

Specifications and Parts List
Parts List
Table A–3 (Cont.) V.35 Connection BC12G-06, 17-03766-01
From
Pin
Connector (P1)

To V.35
Pin
Connector (P2)

Signal Name

12, 29

DTE Ground 31, 34, 371

DTR

Shell

Braid Strap

Overall Cable Shield

Local Loop

1 Contacts tied together.

Table A–4 describes the cable connections for the RS530A standard.
Table A–4 RS530A Cable Connections BC12J-06, 17-03760-01
From
Pin
Connector (P1)

To RS530A
Pin
Connector (P2)

Signal Name

1, 26, 27

–

Code Ground 1

DSR A

5
30

2
14

TX Data A
TX Data B

6
31

8
10

DCD/I A
DCD/I B

1 Contacts tied together.

(continued on next page)

Specifications and Parts List A–9

Specifications and Parts List
Parts List
Table A–4 (Cont.) RS530A Cable Connections BC12J-06, 17-03760-01
From
Pin
Connector (P1)

To RS530A
Pin
Connector (P2)

Signal Name

8
33

4
19

RTS/C A
RTS/C B

9
34

5
13

CTS A
CTS B

10
35

3
16

RX Data A
RX Data B2

Ring Indicate

DCE Ground

13
38

17
9

RX Clock A
RX Clock B2

15
40

24
11

Clock A
Clock B

17
42

15
12

TX Clock A
TX Clock B 2

Test Indicate

Local Loop

2 120 OHM resistor, 1/2W between pins 10 and 35, 13 and 38, 17 and 42. The resistors are located

at P1 end of cable.

(continued on next page)

A–10 Specifications and Parts List

Specifications and Parts List
Parts List
Table A–4 (Cont.) RS530A Cable Connections BC12J-06, 17-03760-01
From
Pin
Connector (P1)

To RS530A
Pin
Connector (P2)

Signal Name

29, 37
44

7
20

DTE Ground1
DTR

Remote Loop

Shell

Shield Braid

1 Contacts tied together.

Table A–5 describes the cable connections for the RS423 standard.
Table A–5 RS423 Cable Connections BC12K-06, 17-03761-01
From
Pin
Connector (P1)

To RS423
Pin
Connector (P2)

Signal Name

1, 2, 27

–

Code Ground 1

4
29

11
29

DSR A
DSR B

6
31

13
31

DCD/I A
DCD/I B

TX Data

9
34

9
27

CTS A
CTS B

1 Contacts tied together.

(continued on next page)

Specifications and Parts List A–11

Specifications and Parts List
Parts List
Table A–5 (Cont.) RS423 Cable Connections BC12K-06, 17-03761-01
From
Pin
Connector (P1)

To RS423
Pin
Connector (P2)

Signal Name

10
35

6
24

RX Data A
RX Data B

Ring Indicate

DCE Ground

13
38

8
26

RX Clock A
RX Clock B

17
42

5
23

TX Clock A
TX Clock B

Test Indicate

Local Loop

RTS/C

19, 22, 25, 30, 35, 37

DTE Ground 1

Speed Select

DTR

Remote Loop

1 Contacts tied together.

(continued on next page)

A–12 Specifications and Parts List

Specifications and Parts List
Parts List
Table A–5 (Cont.) RS423 Cable Connections BC12K-06, 17-03761-01
From
Pin
Connector (P1)

To RS423
Pin
Connector (P2)

Signal Name

Shell

Shield Braid

Clock

Table A–6 describes the cable connections for the V.24/RS232 standard.
Table A–6 V.28/RS232 Cable Connections BC12L-06, 17-03762-01
From
Pin
Connector (P1)

To V.24/RS232
Pin
Connector (P2)

Signal Name

1, 2

–

Code Ground 1

DSR A

DCD/I A

TX Data

CTS A

RX Data A

Ring Indicate

RX Clock A

1 Contacts tied together.

(continued on next page)

Specifications and Parts List A–13

Specifications and Parts List
Parts List
Table A–6 (Cont.) V.28/RS232 Cable Connections BC12L-06, 17-03762-01
From
Pin
Connector (P1)

To V.24/RS232
Pin
Connector (P2)

Signal Name

TX Clock A

Test Indicate

Clock

Local Loop

RTS

12, 29, 31, 34, 35, 37, 38, 42

DTE Ground 1

Speed Select

DTR

Remote Loop

1 Contacts tied together.

A–14 Specifications and Parts List

Specifications and Parts List
Parts List
Table A–7 describes the cable connections for the console converter.
Table A–7 Cable Connections for Console Converter
From
Pin
Connector (P1)

To
Pin
Connector (P2)

Signal Name

DTR

3, 4

GND

8, 6, 1

CTS, DSR, DCD

Specifications and Parts List A–15

B
Related Documentation
The following documents are shipped with the DECbrouter 90:
Document Title

Order Number

DECbrouter 90 Installation and Operating Information

EK-DECBR-OM

DECbrouter 90 Products Configuration and Reference - Volume 1

EK-DECB1-CG

DECbrouter 90 Products Configuration and Reference - Volume 2

EK-DECB2-CG

DECbrouter 90 Products Configuration and Reference - Volume 3

EK-DECB3-CG

DECbrouter 90 Systems Error Messages

EK-DECBR-ML

DECbrouter 90 Products Command Summary

EK-DECBR-CS

DECbrouter 90 Products Getting Started

EK-DECBR-GS

You can order the following documents from Digital:
Document Title

Order Number

DECbridge 90 Owner’s Manual

EK–DEWGB–OM

DEChub 90 Owner’s Manual

EK–DEHUB–OM

Open DECconnect Building Wiring Components and Application
Catalog

EB–K2407–42

DECrepeater 90T Owner’s Manual

EK–DETMR–OM

DECconnect System Planning and Configuration Guide

EK–DECSY–CG