Cabletron Systems CRBRIM-W/T Hardware User's Manual

CRBRIM-W/T

HARDWARE USER’S GUIDE

CABLETRON SYSTEMS, P. O. Box 5005, Rochester, NH 03866-5005

NOTICE

Cabletron Systems reserves the right to make changes in specifications and other information
contained in this document without prior notice. The reader should in all cases consult Cabletron
Systems to determine whether any such changes have been made.

The hardware, firmware, or software described in this manual is subject to change without notice.

IN NO EVENT SHALL CABLETRON SYSTEMS BE LIABLE FOR ANY INCIDENTAL,
INDIRECT, SPECIAL, OR CONSEQUENTIAL DAMAGES WHATSOEVER (INCLUDING BUT
NOT LIMITED TO LOST PROFITS) ARISING OUT OF OR RELATED TO THIS MANUAL OR
THE INFORMATION CONTAINED IN IT, EVEN IF CABLETRON SYSTEMS HAS BEEN
ADVISED OF, KNOWN, OR SHOULD HAVE KNOWN, THE POSSIBILITY OF SUCH
DAMAGES.

This electric hazard symbol appears in the CRBRIM-W/T Hardware User’s Guide.
Read all instructions that appear with this symbol. Failure to follow the instructions
appearing with this symbol could result in the presence of an electric hazard which
has the potential to cause injury.

© Copyright April 1995 by: Cabletron Systems, Inc. P.O. Box 5005 Rochester, NH 03866-5005

All Rights Reserved
Printed in the United States of America
Part Number: 9031380 April 1995

SPECTRUM
MMAC-8FNB, MMAC-5FNB, MMAC-3FNB

Systems, Inc.

Cisco Systems
Ethernet
VT-220
CompuServe

and

LANVIEW

is a registered trademark of Cisco Systems, Inc.

is a registered trademark of Xerox Corp.

and

VT-320

are trademarks of Digital Equipment Corp.

is a registered trademark of CompuServe, Inc.

are registered trademarks and

, and

MicroMMAC

CRBRIM-W/T

are trademarks of Cabletron

,

Printed on

recycled paper.

Hardware User’s Guide

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i

-i

NOTICE

FCC NOTICE

This device complies with Part 15 of the FCC rules. Operation is subject to the following
two conditions: (1) this device may not cause harmful interference, and (2) this de vice must
accept any interference received, including interference that may cause undesired
operation.

NOTE:

digital device, pursuant to Part 15 of the FCC rules. These limits are designed to provide
reasonable protection against harmful interference when the equipment is operated in a
commercial environment. This equipment uses, generates, and can radiate radio frequency
energy and if not installed in accordance with the operator’s manual, may cause harmful
interference to radio communications. Operation of this equipment in a residential area is
likely to cause interference in which case the user will be required to correct the
interference at his own expense.

WARNING:

approved by the party responsible for compliance could void the user’s authority to operate
the equipment.

This equipment has been tested and found to comply with the limits for a Class A

Changes or modifications made to this device which are not expressly

DOC NOTICE

This digital apparatus does not exceed the Class A limits for radio noise emissions from
digital apparatus set out in the Radio Interference Regulations of the Canadian Department
of Communications.

Le présent appareil numérique n’émet pas de bruits radioélectriques dépassant les limites
applicables aux appareils numériques de la class A prescrites dans le Règlement sur le
brouillage radioélectrique édicté par le ministère des Communications du Canada.

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 Information Technology Equipment (VCCI) 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 to radios and TV receivers, etc.

Read the instructions for correct handling

ii

VCCI NOTICE

CRBRIM-W/T

CABLETRON SYSTEMS, INC.

PROGRAM LICENSE AGREEMENT

NOTICE

IMPORTANT:

This document is an agreement between you, the end user, and Cabletron Systems, Inc.
(“Cabletron”) that sets forth your rights and obligations with respect to the Cabletron
software program (the “Program”) contained in this package. The Program may be
contained in firmware, chips or other media. BY UTILIZING THE ENCLOSED
PRODUCT, YOU ARE AGREEING TO BECOME BOUND BY THE TERMS OF THIS
AGREEMENT, WHICH INCLUDES THE LICENSE AND THE LIMITATION OF
WARRANTY AND DISCLAIMER OF LIABILITY. IF YOU DO NOT AGREE TO THE
TERMS OF THIS AGREEMENT , PROMPTL Y RETURN THE UNUSED PRODUCT TO
THE PLACE OF PURCHASE FOR A FULL REFUND.

Before utilizing this product, carefully read this License Agreement.

CABLETRON SOFTWARE PROGRAM LICENSE

1. LICENSE.
in this package subject to the terms and conditions of this License Agreement.

You may not copy, reproduce or transmit any part of the Program except as permitted

by the Copyright Act of the United States or as authorized in writing by Cabletron.

You have the right to use only the one (1) copy of the Program pro vided

2. O
disassemble the Program.

3. APPLICABLE LA
under the laws and in the state and federal courts of New Hampshire. You accept the
personal jurisdiction and venue of the New Hampshire courts.

THER RESTRICTIONS. You may not reverse engineer, decompile, or

Hardware User’s Guide

W. This License Agreement shall be interpreted and governed

Hardware Installation Guide

iii

iii

NOTICE

EXCLUSION OF WARRANTY

AND DISCLAIMER OF LIABILITY

1. EXCLUSION OF
Cabletron in writing, Cabletron makes no warranty, expressed or implied, concerning the
Program (including Its documentation and media).

CABLETRON DISCLAIMS ALL WARRANTIES, OTHER THAN THOSE
SUPPLIED TO YOU BY CABLETRON IN WRITING, EITHER EXPRESS OR
IMPLIED, INCLUDING BUT NOT LIMITED TO IMPLIED WARRANTIES OF
MERCHANTABLITY AND FITNESS FOR A PARTICULAR PURPOSE, WITH
RESPECT TO THE PROGRAM, THE ACCOMPANYING WRITTEN MATERIALS,
AND ANY ACCOMPANYING HARDWARE.

2. NO LIABILITY FOR CONSEQ
CABLETRON OR ITS SUPPLIERS BE LIABLE FOR ANY DAMAGES
WHATSOEVER (INCLUDING, WITHOUT LIMITATION, DAMAGES FOR LOSS OF
BUSINESS, PROFITS, BUSINESS INTERRUPTION, LOSS OF BUSINESS
INFORMATION, SPECIAL, INCIDENTAL, CONSEQUENTIAL, OR RELIANCE
DAMAGES, OR OTHER LOSS) ARISING OUT OF THE USE OR INABILITY TO USE
THIS CABLETRON PRODUCT, EVEN IF CABLETRON HAS BEEN ADVISED OF
THE POSSIBILITY OF SUCH DAMAGES. BECAUSE SOME STATES DO NOT
ALLOW THE EXCLUSION OR LIMITATION OF LIABILITY FOR
CONSEQUENTIAL OR INCIDENTAL DAMAGES, OR ON THE DURATION OR
LIMITATION OF IMPLIED WARRANTEES IN SOME INSTANCES THE ABOVE
LIMITATIONS AND EXCLUSIONS MAY NOT APPLY TO YOU.

WARRANTY. Except as may be specifically provided by

UENTIAL DAMAGES. IN NO EVENT SHALL

UNITED STATES GOVERNMENT RESTRICTED RIGHTS

The enclosed product (a) was developed solely at private expense; (b) contains “restricted
computer software” submitted with restricted rights in accordance with Section 52227-19
(a) through (d) of the Commercial Computer Software - Restricted Rights Clause and its
successors, and (c) in all respects is proprietary data belonging to Cabletron and/or its
suppliers.

For Department of Defense units, the product is licensed with “Restricted Rights” as
defined in the DoD Supplement to the Federal Acquisition Regulations, Section 52.227­7013 (c) (1) (ii) and its successors, and use, duplication, disclosure by the Government is
subject to restrictions as set forth in subparagraph (c) (1) (ii) of the Rights in T echnical Data
and Computer Software clause at 252.227-7013. Cabletron Systems, Inc., 35 Industrial
Way, Rochester, New Hampshire 03867.

iv

CRBRIM-W/T

Contents

Chapter 1 Introduction

1.1 Using This Manual ..........................................................................1-2

1.2 Document Objectives......................................................................1-2

1.3 Document Organization ..................................................................1-2

1.4 Document Conventions................................................................... 1-3

1.5 Related Manuals.............................................................................1-5

1.6 Getting Help....................................................................................1-5

Chapter 2 Product Overview

2.1 System Specifications.....................................................................2-2

2.2 Memory Configurations...................................................................2-3

2.3 Protocol Support .............................................................................2-4

Chapter 3 Preparing for Installation

3.1 Preventing Electrostatic Discharge Damage ..................................3-1

3.2 System Operation Prerequisites .....................................................3-2

3.3 Distance Limitations........................................................................3-2

3.3.1 Serial Connections ..........................................................3-2

3.4 Interference Considerations............................................................3-4

3.5 Console Considerations..................................................................3-5

3.5.1 Console Port Connections...............................................3-5

3.6 Network Connection Considerations...............................................3-5

3.6.1 Token Ring Connections.................................................3-5

3.6.2 Serial Connections ..........................................................3-6

3.7 Inspecting the System..................................................................... 3-6

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CONTENTS

Chapter 4 Installation

4.1 Tools and Parts Required............................................................... 4-1

4.2 Installing the CRBRIM-W/T.............................................................4-2

4.2.1 Installing a CRBRIM-W/T into a MIM ..............................4-2

4.3 Making External Connections......................................................... 4-7

Chapter 5 Troubleshooting the Hardware

Configuration

5.1 Problem Solving..............................................................................5-1

5.1.1 Troubleshooting the Network Interfaces and Cables ...... 5-2

5.1.2 Reading LED Indicators .................................................. 5-2

Chapter 6 Maintenance

6.1 Installing Primary-Memory DRAM SIMMs ...................................... 6-1

6.1.1 Tools and Equipment Required.......................................6-2

6.1.2 Primary Memory Configurations......................................6-2

6.1.3 Approved DRAM SIMMs ................................................. 6-3

6.1.4 DRAM SIMM Installation ................................................. 6-3

6.2 Replacing System-Code SIMMs..................................................... 6-5

6.2.1 Tools and Equipment Required.......................................6-5

6.2.2 System-Code SIMM Replacement..................................6-5

6.3 Recovering a Lost Password.......................................................... 6-7

Appendix A Cabling Specifications

A.1 Console Port Signals and Pinouts ..................................................A-2

A.2 Serial Cable Assemblies and Pinouts.............................................A-3

A.2.1 EIA-530 ...........................................................................A-3

A.2.2 RS-232............................................................................A-5

A.2.3 RS-449............................................................................A-8

A.2.4 V.35...............................................................................A-11

A.2.5 X.21...............................................................................A-14

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CRBRIM-W/T

CONTENTS

Appendix B Virtual Configuration Register

B.1 Virtual Configuration Register Settings...........................................B-1

B.1.1 Changing Configuration Register Settings ......................B-3

B.1.2 Virtual Configuration Register Bit Meanings....................B-5

B.1.3 Enabling Booting from Flash ...........................................B-8

B.1.4 Copying to Flash..............................................................B-8

Appendix C Bootstrap Program

C.1 Entering the Bootstrap Program .....................................................C-1

C.1.1 Available Bootstrap Commands......................................C-2

C.1.2 Running the Diagnostics..................................................C-5

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vii

Chapter 1

Introduction

Welcome to the Cabletron Systems CRBRIM-W/T User’s Guide. This manual
describes features, explains installation procedures, and provides specifications for
the Cabletron Systems CRBRIM-W/T. The CRBRIM-W/T is designed to reside
in, and provide additional connectivity/functionality to v arious Cabletron Systems
MIMs and hubs such as the MicroMMAC.

Figure 1-1. CRBRIM-W/T

Hardware User’s Guide

S0

S0

RESET

S1

SYS S1

TRPWR

Hardware Installation Guide

CONSOLE

TP

1-1

1-1

CHAPTER 1: Introduction

1.1 Using This Manual

Read through this manual completely to familiarize yourself with its content and
to gain an understanding of the features and capabilities of the CRBRIM-W/T. A
general working knowledge of data communications networks and their physical
layer components is helpful when using the CRBRIM-W/T.

1.2 Document Objectives

This publication steps you through initial site preparation, installation, and
troubleshooting. It also covers selected maintenance procedures.

1.3 Document Organization

The major sections of this publication follow:

• Chapter 1, Introduction, outlines the contents, and describes the objectives

and conventions of the

also provides a list of related manuals and

• Chapter 2, Product Overview, contains an overview of the router feature set

and physical specifications.

• Chapter 3, Preparing for Installation, includes safety recommendations, site

requirements, an installation checklist, console port cable connection

considerations, network connection considerations, and instructions for

inspecting the new system.

• Chapter 4, Installation, provides a list of tools and parts required, procedures

for making external connections, and information about what to do after

installing the hardware.

• Chapter 5, Troubleshooting the Hardware Configuration, briefly discusses

troubleshooting, problem solving, and reading LED indicators.

• Chapter 6, Maintenance, includes procedures for upgrading system code

SIMMs, replacing DRAM SIMMs, and recovering from a lost password.

CRBRIM-W/T Hardware User’s Guide

GETTING HELP

. This chapter

information.

1-2

CRBRIM-W/T

Document Conventions

• Appendix A, Cabling Specifications, provides cable illustrations and pinouts
for the console port and serial cables.

• Appendix B, Virtual Configuration Register, discusses the settings for and
functions of the virtual configuration register.

• Appendix C, Bootstrap Program, contains procedures for testing system
memory and the central processor unit (CPU) by using the bootstrap
diagnostic tests and command options.

1.4 Document Conventions

This publication uses the following conventions to convey instructions and
information:

Command descriptions use these conventions:

• Commands and keywords are in

• Variables for which you supply values are in

boldface

font.

italic

font.

• Elements in square brackets ([ ]) are optional.

• Alternative but required keywords are grouped in braces ({ }) and are
separated by a vertical bar ( | ).

Examples use these conventions:

• Terminal sessions are in

• Information you enter is in

screen

font.

boldface screen

font.

• Nonprinting characters are shown in angle brackets (< >).

• Information the system displays is in

screen

font, with default responses in

square brackets ([ ]).

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3

CHAPTER 1: Introduction

Means reader take note. Notes contain helpful suggestions or

NOTE

TIP

references to materials not contained in this manual.

Means the described action saves time. You can save time by
performing the action described in the paragraph.

Means reader be careful. You are capable of doing something that
might result in equipment damage or loss of data.

!

CAUTION

Means electric hazard. You are in a situation that could cause
bodily injury. Before you work on any equipment, be aware of the
hazards involved with electrical circuitry and standard practices
for preventing accidents.

1-4

CRBRIM-W/T

Related Manuals

1.5 Related Manuals

Use the following manuals to supplement the procedures and data provided in this
manual. This manual references procedures in these manuals, when appropriate,
but does not repeat them.

Cabletron Systems’

CRM-DOC

A compilation of Cisco Systems Router Products Configuration and Reference
Guides available through Cabletron Systems.

CRM-CDROM

A compilation of Cisco Systems Router Products Configuration and Reference
Guides on

CD-ROM

MicroMMAC User’s Guide

available through Cabletron Systems.

1.6 Getting Help

If you need additional support related to the Cabletron Systems CRBRIM-W/T , or
if you have any questions or comments related to this manual, contact Cabletron
Systems Technical Support by:

Mail: Cabletron Systems, Inc.,

P.O. Box 5005

Rochester, NH 03866-5005
Phone: [phone], Mon-Fri 8AM to 8PM Eastern T ime
CompuServe: GO CTRON from any ! prompt
Internet Mail: [e-mail]

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5

Chapter 2

Product Overview

Bridge/Router Interface Modules (BRIMs) reside in, and provide additional
connectivity/functionality to, various Cabletron MIMs and hubs (e.g. the
MicroMMAC). Cabletron’s CRBRIM-W/T remote access router provides multi­protocol router capability for Cabletron MMAC (Multi-Media Access Center)
modules and standalone hubs with BRIM slots.

The CRBRIM-W/T utilizes a fixed configuration of two WAN ports, and one
internal Token Ring port. The two high density WAN ports support V.35, X.21,
RS449, RS422, RS530, and RS232 interfaces. The CRBRIM-W/T uses Cisco
Systems routing software and is capable of supporting Frame Relay, X.25, DDN
X.25, SMDS, T1/E1, and DDS circuit connections.

The CRBRIM-W/T uses a FLASH EEPROM and is shipped with system code
operating from Flash memory by default. (For more information on system-code
operation, see Chapter 3, section 3.2 “System Operation Prerequisites.”)

Figure 2-1 shows a front view of the CRBRIM-W/T.

RESET

S1 S0

TRPWR SYS

S1

S0

CONSOLE

Figure 2-1. CRBRIM-W/T

This chapter includes the following sections:

• System Specifications

• Memory Configurations

• Protocol Support

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2-1

2-1

CHAPTER 2: Product Overview

This publication takes you through the initial har dwar e installation

NOTE

and selected maintenance procedures. Refer to your specific MIM
or Management Module Installation Guides and Local
Management Guides for software configuration and operating
information.

2.1 System Specifications

System specifications of the CRBRIM-W/T are listed in Table 2-1.

Table 2-1. System Specifications

Description Design Specification

Dimensions H x W x D 3x12.5x15.5cm
Current

Power dissipation
Processor 20-MHz Motorola 68EC030
Network interface 1 Token Ring and 2 synchronous serial (2501)
Token Ring interface

(internal)
Synchronous serial

interfaces

Console port Asynchronous serial (RJ45)
Operating environment 32 through 104°F (0 through 40°C)
Nonoperating temperature –40 through 185°F (–40 through 85°C)

3.0 to 3.5 amps (A)
40W (max.), 135.5 British thermal units (Btu)/hr

IEEE 802.5 (CRBRIM to RJ45)

RS-232, RS-449, V.35, X.21 (NRZ/NRZI
DTE/DCE2 mode)
EIA-530 (NRZ/NRZI and DTE mode)
All serial interfaces use the DB-60 connector at
the chassis.

1

and

Operating humidity 5 through 95%, noncondensing

1. NRZ = Nonreturn to zero. NRZI = Nonreturn to zero inverted.

2. DTE = Data terminal equipment. DCE = Data communications equipment.

2-2

CRBRIM-W/T

Memory Configurations

2.2 Memory Configurations

The CRBRIM-W/T has the following memory systems:

• Primary memory (main memory)—Dynamic random-access memory

(DRAM) that stores the running configuration and routing tables; mounted on
the system card.

• Shared memory—Shared DRAM that is used for packet buffering by the

router network interfaces.

• System-code memory—Flash or programmable read-only memory (PROM);

stores the operating system software image.

• Boot ROM memory—Stores a subset of the operating system software image

that is called the system bootstrap image or the bootstrap program (or ROM
monitor). The system bootstrap image allows you to boot the router when
Flash memory does not contain a valid system image.

The boot ROM prompt follo ws: Router(boot)>. The bootstrap program (R OM
monitor) prompt is the greater than sign (>), which dif fers from the user-le vel
operating-system prompt of gateway >. (For more information, see Appendix
B, “Virtual Configuration Register,” and Appendix C, “Bootstrap Program.”

• Nonvolatile random-access memory (NVRAM)—Stores the system

configuration file and the virtual configuration register.

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CHAPTER 2: Product Overview

Table 2-2 shows possible memory configurations for the CRBRIM-W/T.

Table 2-2. Memory Configurations

Memory Type Memory Capacity

Primary memory (DRAM SIMMs) 1 MB (expandable to 4 or 16 MB)
Shared (packet) memory 1 MB (DRAM on board)
System-code memory (Flash or

PROMs)
Boot ROM 1 MB
Nonvolatile RAM (NVRAM) 32 KB

1. The router has 2 MB of permanent (fixed) DRAM memory and a DRAM SIMM
socket for upgrading the memory. 1 MB of this permanent memory is used by the
CPU and is called
work interface ports to store packets and is called
a DRAM SIMM is installed in the DRAM SIMM socket, all of the DRAM memory on
this SIMM becomes primary memory for the CPU, and the 2 MB of DRAM that is
permanent on the board becomes shared memory.

2. The ENTERPRISE router ships with 8 MB of System-code memory.

primary

memory. The other 1 MB of memory is used by the net-

4 MB (expandable)

shared

or

packet

1

2

memory. When

2.3 Protocol Support

The CRBRIM-W/T is hardware encoded at the factory to operate with one of three
router software sets. This provides users with the option of selecting IP,

DESKTOP, or ENTERPRISE routing software at the time of purchase.

The CRBRIM-W/T is factory configured for either IP, DESKTOP

NOTE

or ENTERPRISE Routing Softwar e. The factory har dware settings
are permanent and cannot be changed to operate a differ ent r outer
software set.

2-4

CRBRIM-W/T

Protocol Support

The ENTERPRISE router software set provides all Cisco-supported LAN, WAN,
and routing protocols as well as IBM features and protocol translator functionality .
Supported LAN protocols include IP, Novell, IPX, DECnet IV, AppleTalk Phase 1
and 2, bridging, DECnet V, XNS, Banyon VINES, OSI, Apollo Domain, PUP, and
CHA OSnet.

The DESKTOP software set supports IP, Novell, IPX, DECnet IV, AppleTalk
Phase 1 and 2, and bridging.

The IP software set supports IP, and bridging protocols.

CRBRIM-W/T models configured for either DESKTOP or

NOTE

ENTERPRISE Routing Software are shipped with a user
installable 4 megabyte primary memory DRAM SIMM. See
Chapter 6, section 6.1.4 DRAM SIMM Installation for installation
procedur es.

All CRBRIM-W/T models are shipped with Frame Relay and X.25 software that
offers efficient remote site access to packet switched networks.

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Chapter 3

Preparing for Installation

This chapter describes the tasks you must perform before starting actual system
installation.

Sections of this chapter follow:

• Preventing Electrostatic Discharge Damage

• System Operation Prerequisites

• Distance Limitations

• Interference Considerations

• Console Considerations

• Network Connection Considerations

• Inspecting the System

3.1 Preventing Electrostatic Discharge Damage

Electrostatic discharge (ESD) damages equipment and impairs electrical circuitry.
It occurs when electronic components are improperly handled and causes
complete or intermittent failures.

Follow ESD-pre vention procedures when handling electronic components. Ensure
that the chassis is electrically connected to earth ground. Wear an ESD wrist strap,
ensuring that it makes good skin contact. Connect the clip to an unpainted chassis
frame surface to safely channel unwanted ESD voltages to ground. To properly
guard against ESD damage and shocks, the wrist strap and cord must operate
effectively.

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CHAPTER 3: Preparing for Installation

For safety, periodically check the resistance value of the antistatic
strap, which should be within the range of 1 and 10 MΩ.

!

CAUTION

3.2 System Operation Prerequisites

The CRBRIM-W/T is designed to run system code from Flash memory single in­line memory modules (SIMMs). With the proper system code image, the router
also can be run from dynamic random-access memory (DRAM); however, this
operation requires a 4-MB memory upgrade (installation of a 4 MB x 72 pin
DRAM SIMM). Further, operating system code from DRAM can result in a 25­percent decrease in system performance.

Operating the system code from Flash is the default and is recommended for
optimum performance of the router.

3.3 Distance Limitations

When setting up your router, consider distance limitations and potential
electromagnetic interference (EMI) as defined by the Electronic Industries
Association (EIA). Following are the distance limitation specifications for serial
interfaces.

3.3.1 Serial Connections

As with all signaling systems, RS-232 signals travel a limited distance at any
given bit rate; generally, the slower the data rate, the greater the distance.
Table 3-1 shows the standard relationship between baud rate and maximum
distance.

3-2

CRBRIM-W/T

Distance Limitations

Table 3-1. IEEE Standard RS-232 Transmission Speed Versus Distance

!

CAUTION

Baud Rate

2400 200 60
4800 100 30
9600 50 15
19200 25 7.6
38400 12 3.7

Distance
(Feet)

Distance
(Meters)

RS-232 is often used in violation of these specifications. If you
understand the electrical problems that can arise and can
compensate for them, you might be able to get good results at
distances greater than those shown in Table 3-1; however, do so at
your own risk. We recommend that you stay within the standard­defined distance.

Balanced drivers allow RS-449 signals to travel greater distances than RS-232.
Table 3-2 lists the standard relationship between baud rate and maximum distance
for RS-449 signals. These limits are also valid for V.35 and X.21.

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CHAPTER 3: Preparing for Installation

Table 3-2. IEEE Standard RS-449 Transmission Speed Versus Distance

!

CAUTION

Baud

Rate

2400 4100 1250
4800 2050 625
9600 1025 312
19200 513 156
38400 256 78
56000 102 31
T1 50 15

Distance

(Feet)

Distance

(Meters)

The RS-449 and V.35 interfaces support data rates up to 2.048
Mbps. Exceeding this maximum is not recommended; do so at your
own risk.

3.4 Interference Considerations

When you run cables for any significant distance in an electromagnetic field,
interference can occur between the field and the signals on the cables. This fact
has two implications for the construction of terminal plant cabling:

• Plant cabling can emanate radio interference if it is unshielded for too long a
distance.

• Strong electromagnetic interference (EMI) (e.g. lightning or radio
transmitters) can destroy the RS-232 drivers and receivers in the server.

If you use twisted-pair cables with a good distribution of grounding conductors in
your plant cabling, emitted radio interference is unlikely. If you exceed the
maximum distances, ground the conductor for each data signal; however, this
practice is not recommended.

3-4

CRBRIM-W/T

Console Considerations

If you have cables exceeding recommended distances, or if you have cables that
pass between buildings, giv e special consideration to the ef fect of lightning strikes
or ground loops. The electromagnetic pulse caused by lightning or other high­energy phenomena can easily couple enough energy into unshielded conductors to
destroy electronic devices. If your site has experienced problems of this sort,
consult experts in lightning suppression and shielding.

Most data centers cannot resolve the infrequent, but potentially catastrophic
problems just described without pulse meters and other special equipment. Take
precautions to avoid these problems by providing a properly grounded and
shielded environment, with special attention to issues of electrical surge
suppression.

To predict and remedy strong electromagnetic interference, consult experts in
radio-frequency interference (RFI).

3.5 Console Considerations

Before connecting the console port, read the following section.

3.5.1 Console Port Connections

Each router system includes an RJ45 console asynchronous serial port wired as a
data communications equipment (DCE) device. This port connects to a terminal
using an RJ45-to-DB-25 adapter . Table A-1 in Appendix A lists the pinout for this
console port. The default parameters for the console port follo w: 9600 baud, 8 data
bits, no parity generated or checked, and two stop bits. The console port does not
support hardware flow control.

3.6 Network Connection Considerations

Read this section to prepare for your network connections.

3.6.1 Token Ring Connections

The Token Ring port is an RJ45 connector (Figure 4-3) located on the rear left of
the BRIM module. Use the supplied cable to connect the Token Ring port on the
CRBRIM-W/T to the RJ45 port on the host MIM/Hub. Refer to the host MIM/
Hub User’s Guide for proper installation guidelines.

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CHAPTER 3: Preparing for Installation

3.6.2 Serial Connections

Two serial interface ports are located on the faceplate of the BRIM to the left of
the console connector . The ports are labeled S0 and S1. The serial ports are 60-pin,
D-type subconnectors. All serial interfaces except the EIA-530 can be configured
as DCE, using a DCE cable. All DTE serial ports require that e xternal clocking be
provided by a CSU/DSU or modem.

You must use a special serial cable to connect the router to a modem or CSU/DSU.
This cable is available from Cabletron and is usually ordered with the system. The
cable uses a DB-60 connector on the chassis end. See Appendix A, for cable
specifications. For ordering information, contact Cabletron Systems Technical
Support.

Due to the small size of the pins on the DB-60 serial connector,

NOTES

attempting to manufacture your own serial cables is not
recommended.

3.7 Inspecting the System

Do not unpack the CRBRIM-W/T until you are prepared to install it. If the final
installation site will not be ready for some time, keep the module in its shipping
container to prevent accidental damage. The CRBRIM-W/T package includes the
following:

• CRBRIM-W/T module

• Console cable (RJ45) with RJ45-to-DB-25 adapter

• Token Ring cable (CRBRIM-W/T to RJ45)

• Hardware User’s Guide

• ESD Wrist Strap

Inspect all items for shipping damage. If anything appears damaged, or if you
encounter problems when installing or configuring your system, contact Cabletron
Systems Technical Support.

3-6

CRBRIM-W/T

Chapter 4

Installation

This chapter guides you through the installation of the CRBRIM-W/T and
includes the following sections:

• Tools and Parts Required

• Installing the CRBRIM-W/T

• Making External Connections

4.1 Tools and Parts Required

Following are the tools and parts required to install the CRBRIM-W/T:

• ESD-preventive wrist strap

• 1 Token Ring RJ45 connector cable (included in your CRBRIM-W/T
package)

• 2 faceplate screws

• 2 support post screws (included in your BRIM package)

• 1 Phillips screwdriver

• One interface cable for each interface you require.

In addition, you might need the following external equipment:

• Channel service unit/digital service unit (CSU/DSU) for the serial interfaces

• Modem for remote configuration (if required)

• Console terminal (configured for 9600 baud, 8 data bits, no parity, and 2 stop
bits), if future reconfiguration is desired.

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4-1

CHAPTER 4: Installation

4.2 Installing the CRBRIM-W/T

This section contains procedures on how to install a CRBRIM-W/T.
You can install a CRBRIM-W/T in any Cabletron T oken Ring de vice that supports

a BRIM and provides an internal Token Ring RJ45 connection.
Refer to specific MIM or hub documentation for exact BRIM and Token Ring

RJ45 connector locations.

Cabletron supplies a user installable 4 megabyte DRAM SIMM

NOTE

with CRBRIM-W/T models configured for DESKTOP or
ENTERPRISE routing software. Install the DRAM SIMM before
installing the CRBRIM-W/T into your MMAC hub. See Chapter 6,
section 6.1.4 for DRAM installation instructions.

4.2.1 Installing a CRBRIM-W/T into a MIM

To install a CRBRIM-W/T into a Token Ring Media Interface Module (MIM) that
supports BRIM technology:

The CRBRIM-W/T and the host MIM are sensitive to static
discharges. Ensure that you use a grounding strap and observe all

!

CAUTION

1. Power-down your MMAC hub and remove all power cords.

NOTE

static precautions during this procedure. Failure to do so could
result in damage to the CRBRIM-W/T or the host MIM.

Cabletron recommends that you power down your hub even
though Cabletron MIMs have “hot swap” capabilities.

2. Disconnect all cables from the MIM into which the CRBRIM-W/T is to be
installed. Note each cable-to-port connection.

3. Attach the disposable grounding strap to your wrist and to a proper ground
(refer to the instructions outlined on the grounding strap package).

4-2

CRBRIM-W/T

Installing the CRBRIM-W/T

4. Unscrew the top and bottom knurled knobs of the MIM face plate.

5. Slide out the MIM, and place it on its side with the internal components
facing up. (See Figure 4-1.)

6. Remove the BRIM coverplate screws and the coverplate.

7. Remove BRIM standoff screws.

8. Place your CRBRIM-W/T behind the MIM faceplate. (See Figure 4-2.)

Standoff

Coverplate

9. Insert the connector pins of the CRBRIM-W/T into the motherboard
connector on the MIM.

10. Press down firmly on the back of the BRIM until the pins slide all the way
into the connector holes.

Hardware User’s Guide

Figure 4-1. Removing the Coverplate

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3

CHAPTER 4: Installation

CONSOLE

S0

S1

TRPWR SYS

RESET

RESET

S0

S1

TP

Figure 4-2. Installing the CRBRIM-W/T

Ensure that the standoffs on the MIM align with the standoff screw

NOTE

holes on the CRBRIM-W/T.

11. Reinstall the faceplate mounting screws and standoff screws.

12. Plug one end of the Token Ring cable into the RJ45 connector located on the
back of the CRBRIM-W/T. (See Figure 4-3.)

13. Plug the other end of the cable into the internal RJ45 connector labeled
“BRIM” on the MIM.

4-4

CRBRIM-W/T

Installing the CRBRIM-W/T

CRBRIM-W/T

Token Ring RJ45 Cable

Figure 4-3. Installing the CRBRIM-W/T

Rear Panel

Front Panel

Refer to your specific MIM documentation for the location of the

NOTE

internal RJ45 Token Ring connector.

14. Reinstall the MIM in the MMAC.

15. Reattach all MMAC power cords.

16. Reattach the network cabling to the MIM.

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5

CHAPTER 4: Installation

4.2.2 Installing the CRBRIM-W/T into a Hub

To install a CRBRIM-W/T into a standalone hub that supports BRIM technology
and has an internal RJ45 Token Ring connection (e.g., MicroMMAC):

The CRBRIM-W/T and the host hub are sensitive to static

!

CAUTION

1. Power-down your hub and remove the power cord.

2. Disconnect all cables from the hub. Note the ports to which these cables are
attached (this step is optional).

Remove the hub chassis cover. Refer to your specific hub documentation for
instructions on removing the hub chassis cover.

discharges. Ensure that you use a grounding strap and observe all
static precautions during this procedure. Failure to do so could
result in damage to the CRBRIM-W/T or the host hub.

Ensure that you remove the power cord and ONLY the screws
required to remove the chassis cover. Failure to comply could
result in an electric shock hazard.

3. Remove the BRIM coverplate screws and the coverplate. (See Figure 4-1.)

4. Place your BRIM behind the hub face plate. (See Figure 4-2.)

5. Insert the connector pins of the BRIM into the hub’s mother board connector.

6. Press down firmly on the back of the BRIM until the pins slide all the way
into the connector holes.

The CRBRIM-W/T connector must fit secur ely on the mother board

NOTE

7. Reinstall the faceplate mounting screws, and install the support post screws.

connector.

4-6

CRBRIM-W/T

Making External Connections

8. Plug one end of the Token Ring cable into the RJ45 connector located on the
back of the BRIM. (See Figure 4-3.)

9. Plug the other end of the cable into the RJ45 connector labeled “BRIM”
located on the hub’s mother board shown in Figure 4-3.

Ensure that the chassis cover is in place before reconnecting the
power cord.

10. Reattach the chassis cover to the hub and reconnect the hub to your network.

4.3 Making External Connections

Following are the procedures for making external connections to the
CRBRIM-W/T with the following connectors:

• Synchronous serial DB-60 connectors

• Console RJ45

1. Connect a serial port on the CRBRIM-W/T to the modem or CSU/DSU with
the appropriate serial transition cable (See Appendix A). Be certain to connect
the 60-pin serial port connector end of the cable to the CRBRIM-W/T.

2. The console port on the faceplate of the CRBRIM-W/T uses an RJ45-type
connector. See Appendix A for specific RJ45 to DB-25 cable specifications.
Be sure that your terminal is operating at 9600 baud, 8 data bits, no parity
generated, and two stop bits.

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7

Chapter 5

Troubleshooting the Hardware

Configuration

Your CRBRIM-W/T module went through extensive testing and burn-in before
leaving the factory. Howev er, if your system appears to have problems starting up,
follow the steps in this chapter to help identify the problem.

Sections of this chapter follow:

• Problem Solving

• Reading LED Indicators

Use the information in this chapter to help isolate problems. This section is
designed to help you rule out the CRBRIM-W/T system as the problem source.
Whether or not you can locate the source of your problem, contact a service
representative for information on ho w to proceed in resolving the problem. Before
you call, have the following information ready:

• Serial number

• Software version level and hardware configuration

• System software configuration

• Brief description of the problem you are having

• Brief explanation of steps you have taken to isolate the problem

5.1 Problem Solving

The key to problem solving in this system is to try to isolate the problem to a
specific subsystem. By comparing what the system is doing to what it should be
doing, the task of isolating a problem is greatly simplified.

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5-1

CHAPTER 5: Troubleshooting the Hardware Configuration

When problem solving consider the following subsystems of the CRBRIM-W/T:

• Network interfaces—The LEDs can be used to help identify a failure. For
complete information on LED indicators, refer to the section “Reading LED
Indicators.”

• System cables—This includes all of the interface cables that connect the
CRBRIM-W/T to the network.

5.1.1 Troubleshooting the Network Interfaces and Cables

Check for the following symptoms to help isolate the problem:

• A network interface is not recognized by the system.

- Check the interface cable connection.

- Check the LED that corresponds to the network interface.

• A network interface is recognized, but it will not initialize: check the interface
cable connection.

• System will not boot properly or constantly/intermittently reboots: suspect the
processor or software.

• System boots, but console screen is frozen.

- Check the external console connection.

- Verify the console baud rate in the terminal documentation.

• System powers on and boots with a particular interface disconnected: suspect
the network interface connection.

• System powers on and boots with a particular cable disconnected: suspect the
cable.

5.1.2 Reading LED Indicators

Note the activity of the LEDs to judge the activity of the interfaces to which they
correspond. If an LED is not on when the interface is active and the interface is
correctly connected, a problem might be indicated. If an interface is extremely
busy, its LED will be on all the time. (See Figure 5-1.)

5-2

CRBRIM-W/T

Table 5-3. CRBRIM-W/T LEDs

LED COLOR DESCRIPTION

Problem Solving

SYS yellow

PWR green

TR yellow

S0 yellow

S1 yellow

LED ON indicates system is OK. LED OFF
indicates system failure.

LED ON indicates power is ON. LED OFF
indicates power is OFF.

LED ON indicates Token Ring is active.
LED OFF indicates no traffic on Ring.

LED ON indicates WAN (S0) is active. LED
OFF indicates no trafffic on WAN.

LED ON indicates WAN (S1) is active. LED
OFF indicates no trafffic on WAN.

S1 S0

CONSOLE

RESET

Figure 5-1. CRBRIM-W/T LED Indicators

Hardware User’s Guide

TRPWR SYS

S1

Hardware Installation Guide

S0

5-3

3

Chapter 6

Maintenance

This chapter contains information on maintenance procedures you might need to
perform as your internetworking needs change.

This chapter contains the following sections:

• Installing Primary-Memory DRAM SIMMs

• Replacing System-Code SIMMs

• Recovering a Lost Password

6.1 Installing Primary-Memory DRAM SIMMs

The CRBRIM-W/T contains primary and shared (or packet) memory. Primary
memory size, in kilobytes (KB), is displayed in the system banner on the console
screen. Primary and shared memory are 1 MB each of the dynamic random-access
memory (DRAM) on the system board.

After booting up, your system’s primary memory is indicated in the system
banner. The following example shows a system with 1 MB (1024 KB) of primary
memory. (The system does not display shared memory.)

System Bootstrap, Version (2.1), SOFTWARE
Copyright (c) 1986-1994 by cisco Systems
2500 processor with 1024 Kbytes of main memory
>

If you use very large routing tables or many protocols, you might need to expand
primary memory . This expansion might be necessary with configurations in which
the CRBRIM-W/T is set up as a connection device between large external
networks and your internal network.

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6-1

CHAPTER 6: Maintenance

6.1.1 Tools and Equipment Required

• ESD-preventive wrist strap

• The appropriate DRAM SIMM for your CRBRIM-W/T model

6.1.2 Primary Memory Configurations

You can upgrade to 4- or 16-MB DRAM: the 4-MB upgrade kit includes one 4
MB x 72 pin DRAM SIMM, and the 16 MB kit includes one 16 MB x 72 pin
DRAM SIMM. As primary memory is expanded to 4- or 16-MB SIMMs, the 2
MB of permanent memory is allocated as shared memory. The location of the
DRAM SIMM on your CRBRIM-W/T is shown in Figure 6-1.

CRBRIM-W/T

DRAM SIMM Slot

Figure 6-1. SIMM Location on the CRBRIM-W/T

System (FLASH) SIMM Slot

6-2

CRBRIM-W/T

Installing Primary-Memory DRAM SIMMs

6.1.3 Approved DRAM SIMMs

Following is an approved listing of 70 nanosecond (ns) DRAM SIMMs.

Table 6-4. Approved DRAM SIMMs

4-MB Upgrade (4 MB,

70 ns DRAM SIMMs)

Manufacturer

Cabletron 2070093 Mitsubishi MH4M36ANXJ-7
Micron MT9D136M-7 – –
NEC MC421000A36BE-70 – –

Manufacturer Part

Number

16-MB Upgrade (16 MB,

70 ns DRAM SIMMs)

Manufacturer

Manufacturer

Part Number

After booting up, your system will indicate in the system banner the amount of
primary memory installed. The following e xample sho ws a system with 4,096 KB
(or 16,384 KB for the 16-MB upgrade) of primary memory:

System Bootstrap, Version (2.1), SOFTWARE
Copyright (c) 1986-1994 by cisco Systems
2500 processor with 4096 Kbytes of main memory (or
for 16 MB upgrade)
>

16384 kbytes

6.1.4 DRAM SIMM Installation

Following is the procedure for installing DRAM SIMMs:

1. Attach an ESD-preventive wrist strap.

2. Turn the BRIM so the DRAM SIMM socket is toward you.

3. Remove the existing DRAM SIMM by pulling outward on the connectors to
unlatch them. Be careful not to break the holders on the SIMM connector.

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3

CHAPTER 6: Maintenance

DRAM SIMM

Polarization Notch

CRBRIM-W/T Faceplate

DRAM SIMM Installed

SIMM Socket

Figure 6-2. Removing and Replacing the DRAM SIMM

4. Using the system board orientation shown in Figure 6-2 (top), position the
new SIMM so that the polarization notch is located at the right end of the
SIMM socket.

5. Insert the new DRAM SIMM by sliding the edge with the metal fingers into
the SIMM connector socket at a slight angle to the socket. Gently rock the
SIMM back into place until the latch on either side snaps into place. Do not
use excessive force, or the connector could break.

6. Connect the CRBRIM-W/T to a console terminal.

6-4

CRBRIM-W/T

Replacing System-Code SIMMs

6.2 Replacing System-Code SIMMs

The system code (software) is stored on a Flash SIMM. The 80-pin Flash SIMM
must be purchased from Cabletron. Contact a customer service representative for
more information.

6.2.1 Tools and Equipment Required

• ESD-preventive wrist strap

• The appropriate system-code SIMM(s) for your CRBRIM-W/T model

The Flash SIMM for the CRBRIM-W/T is available only from

NOTE

Cabletron. Contact Cabletron Systems for more information.

6.2.2 System-Code SIMM Replacement

Following is the procedure for upgrading the system-code Flash or PROM
SIMMs:

1. Attach an ESD-preventive wrist strap.

2. Turn the CRBRIM-W/T so that the system board is in the position shown in
Figure 6-3, with the system-code SIMM toward you.

3. Locate the system-code SIMMs on the CRBRIM-W/T. (See Figure 6-1.)

4. Remove the existing system-code SIMM by pulling outward on the
connectors to unlatch them. The connector holds the SIMM tightly, so be
careful not to break the holders on the SIMM connector.

To prevent damage, do not push on the center of the SIMMs.
Handle each SIMM with care.

!

CAUTION

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6-5

5

CHAPTER 6: Maintenance

System (FLASH) SIMM

System SIMM Socket

Polarization Notch

CRBRIM-W/T Faceplate

System SIMM Installed

Figure 6-3. Removing and Replacing the System (FLASH) SIMM

Using the system board orientation shown in Figure 6-3, position the new SIMM
so that the polarization notch is located at the right end of the SIMM socket.

Some Flash SIMMs have the components mounted on the rear

NOTE

side; therefore, when inserting the SIMM, always use the
polarization notch as a reference and not the position of the
components on the SIMM.

5. Insert the new SIMM by sliding the edge with the metal fingers into the
SIMM connector socket at a slight angle to the system socket. Gently rock the
SIMM back into place until the latch on either side snaps into place. Do not
use excessive force, or the connector could break.

6-6

CRBRIM-W/T

Recovering a Lost Password

6. Connect the CRBRIM-W/T to a console terminal.

If error messages relating to memory are displayed, repeat steps 1 through 6,
taking care to firmly seat the SIMM in the socket.

6.3 Recovering a Lost Password

An overview of recovering a lost password follows:

• Enter the show version command to note the existing virtual configuration

register value.

• Break to the bootstrap program prompt (ROM monitor).

• Change the configuration register to 0x141 (ignore break; ignore NVRAM;
boot from ROM).

A key to recovering a lost password is to set the configuration

NOTE

register so that the NVRAM contents are ignored (0x0040),
allowing you to see your password.

• Enter the privileged mode in the system bootstrap program.

• Enter the show configuration command to display the enable password.

• Change the configuration register value back to its original setting.

To recover a lost password if Break is disabled, you must have

NOTE

physical access to the CRBRIM-W/T.

To recover a lost password, follow this procedure:

1. Attach an ASCII terminal to the BRIM console port (see Chapter 3, Section

3.5 Console Port Connections).

2. Configure the terminal to operate at 9600 baud, 8 data bits, no parity, 2 stop
bits (or to whatever settings the CRBRIM-W/T is set).

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7

CHAPTER 6: Maintenance

3. Enter the command show version to display the existing configuration

register value.

4. If Break is disabled, power cycle the CRBRIM-W/T. (Reset the MIM.) If
Break is enabled on the CRBRIM-W/T, send a Break and proceed to step 5.

5. Within 60 seconds of resetting the MIM, press the Break key. This action
causes the terminal to display the bootstrap program prompt (>).

6. To reset the configuration register to boot from the boot ROMs and ignore
NVRAM, enter o/r at the bootstrap prompt as follows:

> o/r

7. Initialize the CRBRIM-W/T by entering the i command as follows:

> i

The CRBRIM-W/T will power cycle; the configuration register will be set to
0x141; and the CRBRIM-W/T will boot the boot ROM system image and
prompt you with the system configuration dialog as follows:

--- System Configuration Dialog ---

8. Enter no in response to the system configuration dialog prompts until the
following system message is displayed:

Press RETURN to get started!

9. Press Return. The boot ROM prompt appears as follows:

Router(boot)>

10. Enter the enable command to enter the EXEC mode in the boot ROM image.
The prompt changes to the following:

Router (boot)#

11. Enter the show configuration EXEC command to display the enable
password in the router configuration file and to display any boot system
commands.

6-8

CRBRIM-W/T

Recovering a Lost Password

12. Enter the configure terminal command at the EXEC prompt. You are

prompted as follows:

Router (boot)# configure
Configuring from terminal, memory, or network [terminal]? <cr>
Enter Configuration commands, one per line.
Edit with DELETE, CTRL/W, and CTRL/U; end with CTRL/Z

13. Using the config-reg Oxvalue command, change the configuration register

value back to its original value (from step 3) or change it to a value of Ox102,
which in the absence of a boot system command in the configuration file,
causes the router to boot from Flash memory.

14. Exit configuration mode by entering Ctrl-Z.

15. Reboot the router and enter enable mode using the recovered password.

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9

Appendix A

Cabling Specifications

This appendix provides pinouts for the following:

• Console asynchronous serial, Table A-1, page A-2

• EIA-530 synchronous serial DTE, Table A-2, page A-3

• RS-232 synchronous serial DTE, Table A-3, page A-5

• RS-232 synchronous serial DCE, Table A-4, page A-7

• RS-449 synchronous serial DTE, Table A-5, page A-8

• RS-449 synchronous serial DCE, Table A-6, page A-10

• V.35 synchronous serial DTE, Table A-7, page A-11

• V.35 synchronous serial DCE, Table A-8, page A-13

• X.21 synchronous serial DTE, Table A-9, page A-15

• X.21 synchronous serial DCE, Table A-10, page A-16

Due to the small pins on the DB-60 connector (used for the serial

NOTE

cables), manufacturing and soldering these cables yourself might
be very difficult and is not recommended. Use the cable assembly
drawings in this appendix if you need to troubleshoot interface
cables. In the following tables, serial pinouts representing DTE
and DCE cables use arrows to indicate signal direction: —>
indicates DTE to DCE, and <— indicates DCE to DTE.

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Hardware Installation Guide

A-1

A-1

Appendix A: Cabling Specifications

A.1 Console Port Signals and Pinouts

The console port is configured as data communications equipment (DCE). The
console uses RJ45 connectors. RJ45 to DB-25 adapters are available for
connection to modems and other external communications equipment. Following
are the pinouts for the console port and adapter (see Table A-1):

Table A-1. Console Port Pinouts (RJ45 to DB-25 Female)

Console Port (DCE) RJ45 to DB-25 Adapter

1

Pin

1 RxD Output 1 RxD 3

Signal Input/Output Pin Signal Pin

2 DTR Input 2 DTR 20
3– – 3– –
4 TxD Input 4 TxD 2
5 GND – 5 GND 7
6 CTS Output 6 CTS 5
7– – 7– –
8– – 8– –

1. Any pin not referenced is not connected.

A-2

CRBRIM-W/T

Serial Cable Assemblies and Pinouts

A.2 Serial Cable Assemblies and Pinouts

The following illustrations and tables provide assembly drawings and pinouts for
the EIA-530 DCE, and RS-232, RS-449, V.35, and X.21 DTE and DCE cables.

A.2.1 EIA-530

Figure A-1 shows the EIA-530 serial cable assembly, and Table A-2 lists the
pinouts. Arrows indicate signal direction: —> indicates DTE to DCE, and <—
indicates DCE to DTE.

J1-46
J1-45
J1-16
J1-15

J1-1
J1-30
J1-31
J1-60

60-pin connector 25-pin connector

Connectors are not to scale

Figure A-1. EIA-530 Cable Assembly

J2-13
J2-25


H1972

J2-14
J2-1


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A-3

3

Appendix A: Cabling Specifications

Table A-2. EIA-530 DTE Cable Pinout (DB-60 to DB-25)

60

Pin

J1-11
J1-12

J1-28
J1-27

J1-9
J1-10

J1-1
J1-2

J1-3
J1-4

J1-46
J1-47

J1-48
J1-49

Signal 25 Pin Signal

1

TxD/RxD+
TxD/RxD–

RxD/TxD+
RxD/TxD–

RTS/CTS+
RTS/CTS–

CTS/RTS+
CTS/RTS–

DSR/DTR+
DSR/DTR–

Shield_GND
MODE_2

GND
MODE_1––

J2-2
J2-14

J2-3
J2-16

J2-4
J2-19

J2-5
J2-13

J2-6
J2-22

J2-1–Shield

Direc-

tion

DTE

DCE

BA(A),TxD+
BA(B), TxD–—>—>

BB(A),RxD+
BB(B),RxD–<—<—

CA(A),RTS+
CA(B),RTS–—>—>

CB(A),CTS+
CB(B),CTS– <—<—

CC(A),DSR+
CC(B),DSR–<—<—

Short J1-13

–
–

–

Short J1-51

60 Pin Signal 25 Pin Signal

2

J1-5
J1-6

J1-24
J1-23

J1-26
J1-25

J1-44
J1-45

J1-7
J1-8

J1-14

J1-52

DCD/DCD+
DCD/DCD–

TxC/RxC+
TxC/RxC–

RxC/TxCE+
RxC/TxCE–

LL/DCD
Circuit_GND

DTR/DSR+
DTR/DSR–

TxCE/TxC+
TxCE/TxC–

GND
MODE_DCE––

J2-8
J2-10

J2-15
J2-12

J2-17
J2-9

J2-18
J2-7

J2-20
J2-23

J2-24
J2-11

CF(A),DCD+
CF(B),DCD–<—<—

DB(A),TxC+
DB(B),TxC–<—<—

DD(A),RxC+
DD(B),RxC–<—<—

LL
Circuit_GND—>–

CD(A),DTR+
CD(B),DTR–—>—>

DA(A) TxCE+
DA(B) TxCE–—>—>

–
–

Direc-

tion

DTE

DCE

Short

1. Any pin not referenced is not connected.

2. The EIA-530 interface cannot be operated in DCE mode. A DCE cable is not available for
the EIA-530 interface.

A-4

CRBRIM-W/T

Serial Cable Assemblies and Pinouts

A.2.2 RS-232

Figure A-2 sho ws the RS-232 cable assembly; Table A-3 lists the DTE pinout; and
Table A-4 lists the DCE pinout. Arrows indicate signal direction: —> indicates
DTE to DCE, and <— indicates DCE to DTE.

J1-46
J1-45
J1-16
J1-15

J1-1
J1-30
J1-31
J1-60

60-pin connector 25-pin connector

H1972

Connectors are not to scale

Figure A-2. RS-232 Cable Assembly

Table A-3. RS-232 DTE Cable Pinout (DB-60 to DB-25)

J2-13
J2-25


J2-14
J2-1


60 Pin

J1-50
J1-51
J1-52

J1-46 Shield GND Single – J2-1 Shield GND
J1-41

Shield
J1-36

Shield
J1-42

Shield

1

MODE_0
GND
MODE_DCE

TxD/RxD
–

RxD/TxD
–

RTS/CTS
–

Signal Note Direction 25 Pin Signal

Hardware User’s Guide

Shorting Group – – –

Twisted pair no. 5 —>

–

Twisted pair no. 9 <—

–

Twisted pair no. 4 —>

–

J2-2
Shield

J2-3
Shield

J2-4
Shield

Hardware Installation Guide

TxD
–

RxD
–

RTS
–

A-5

5

Appendix A: Cabling Specifications

Table A-3. RS-232 DTE Cable Pinout (DB-60 to DB-25) (Continued)

60 Pin

J1-35
Shield

J1-34
Shield

J1-45
Shield

J1-33
Shield

J1-37
Shield

J1-38
Shield

J1-44
Shield

J1-43
Shield

1

Signal Note Direction 25 Pin Signal

CTS/RTS
–

DSR/DTR
–

Circuit GND–Twisted pair no. 1 –

DCD/LL
–

TxC/NIL
–

RxC/TxCE
–

LL/DCD
–

DTR/DSR
–

Twisted pair no. 10 <—

Twisted pair no. 11 <—

Twisted pair no. 12 <—

Twisted pair no. 8 <—

Twisted pair no. 7 <—

Twisted pair no. 2 —>

Twisted pair no. 3 —>

J2-5

–

–

–

–

–

–

–

–

Shield
J2-6

Shield
J2-7

Shield
J2-8

Shield
J2-15

Shield
J2-17

Shield
J2-18

Shield
J2-20

Shield

CTS
–

DSR
–

Circuit GND
–

DCD
–

TxC
–

RxC
–

LTST
–

DTR
–

J1-39
Shield

1. Any pin not referenced is not connected.

TxCE/TxC
–

Twisted pair no. 6 —>

J2-24

–

Shield

TxCE
–

A-6

CRBRIM-W/T

60 Pin

Serial Cable Assemblies and Pinouts

Table A-4. RS-232 DCE Cable Pinout (DB-60 to DB-25)

1

Signal Note Direction 25 Pin Signal

J1-50
J1-51

J1-46 Shield GND Single – J2-1 Shield GND
J1-36

Shield
J1-41

Shield
J1-35

Shield
J1-42

Shield
J1-43

Shield
J1-45

Shield
J1-44

Shield

MODE_0
GND

RxD/TxD
–

TxD/RxD
–

CTS/RTS
–

RTS/CTS
–

DTR/DSR
–

Circuit GND–Twisted pair no. 1 –

LL/DCD
–

Shorting Group – – –

Twisted pair no. 9 <—

Twisted pair no. 5 —>

Twisted pair no. 10 <—

Twisted pair no. 4 —>

Twisted pair no. 3 —>

Twisted pair no. 2 —>

J2-2

–

–

–

–

–

–

–

Shield
J2-3

Shield
J2-4

Shield
J2-5

Shield
J2-6

Shield
J2-7

Shield
J2-8

Shield

TxD
–

RxD
–

RTS
–

CTS
–

DSR
–

Circuit GND

DCD
–

J1-39
Shield

J1-40
Shield

J1-33
Shield

J1-34
Shield

J1-38
Shield

1. Any pin not referenced is not connected.

TxCE/TxC
–

NIL/RxC
–

DCD/LL
–

DSR/DTR
–

RxC/TxCE
–

Twisted pair no. 7 —>

Twisted pair no. 6 —>

Twisted pair no. 12 <—

Twisted pair no. 11 <—

Twisted pair no. 8 <—

J2-15

–

–

–

–

–

Shield
J2-17

Shield
J2-18

Shield
J2-20

Shield
J2-24

Shield

TxC
–

RxC
–

LTST
–

DTR
–

TxCE
–

Hardware User’s Guide

Hardware Installation Guide

A-7

7

Appendix A: Cabling Specifications

A.2.3 RS-449

Figure A-3 shows the RS-449 cable assembly; Table A-5 lists the DTE pinout;
Table A-8 lists the DCE pinout. Arrows indicate signal direction: —> indicates
DTE to DCE, and <— indicates DCE to DTE.

J1-46
J1-45
J1-16
J1-15

J1-1
J1-30
J1-31
J1-60

60-pin connector (J1)

Connectors are not to scale

37-pin connector (J2)

Figure A-3. RS-449 Cable Assembly

Table A-5. RS-449 DTE Cable Pinout (DB-60 to DB-37)

J2-19
J2-37


H1973

J2-20
J2-1

60

1

Pin

J1-49
J1-48

J1-51
J1-52

J1-46 Shield_GND Single _ J2-1 Shield GND
J1-11

J1-12
J1-24

J1-23

Signal Note Direction 37 Pin Signal

MODE_1
GND

GND
MODE_DCE

TxD/RxD+
TxD/RxD–

TxC/RxC+
TxC/RxC–

A-8

Shorting Group – – –

Shorting Group – – –

Twisted pair no. 6 —>

—>

Twisted pair no. 9 <—

<—

J2-4
J2-22

J2-5
J2-23

CRBRIM-W/T

SD+
SD–

ST+
ST–

Serial Cable Assemblies and Pinouts

Table A-5. RS-449 DTE Cable Pinout (DB-60 to DB-37) (Continued)

60

Pin

J1-28
J1-27

J1-9
J1-10

J1-26
J1-25

J1-1
J1-2

J1-44
J1-45

J1-3
J1-4

J1-7
J1-8

J1-5
J1-6

1

Signal Note Direction 37 Pin Signal

RxD/TxD+
RxD/TxD–

RTS/CTS+
RTS/CTS–

RxC/TxCE+
RxC/TxCE–

CTS/RTS+
CTS/RTS–

LL/DCD
Circuit_GND

DSR/DTR+
DSR/DTR–

DTR/DSR+
DTR/DSR–

DCD/DCD+
DCD/DCD–

Twisted pair no. 11 <—

<—

Twisted pair no. 5 —>

—>

Twisted pair no. 10 <—

<—

Twisted pair no. 1 <—

<—

Twisted pair no. 12 —>

_

Twisted pair no. 2 <—

<—

Twisted pair no. 4 —>

—>

Twisted pair no. 3 <—

<—

J2-6
J2-24

J2-7
J2-25

J2-8
J2-26

J2-9
J2-27

J2-10
J2-37

J2-11
J2-29

J2-12
J2-30

J2-13
J2-31

RD+
RD–

RS+
RS–

RT+
RT–

CS+
CS–

LL
SC

DM+
DM–

TR+
TR–

RR+
RR–

J1-13
J1-14

J1-15
J1-16

1. Any pin not referenced is not connected.

TxCE/TxC+
TxCE/TxC–

Circuit_GND
Circuit_GND

Twisted pair no. 7 —>

Twisted pair no. 9 –

—>

–

J2-17
J2-35

J2-19
J2-20

TT+
TT–

SG
RC

Hardware User’s Guide

Hardware Installation Guide

A-9

9

Appendix A: Cabling Specifications

Table A-6. RS-449 DCE Cable Pinout (DB-60 to DB-37)

60

1

Pin

J1-49
J1-48

J1-46 Shield_GND Single – J2-1 Shield GND
J1-28

J1-27
J1-13

J1-14
J1-11

J1-12
J1-1

J1-2
J1-24

J1-23
J1-9

J1-10

Signal Note Direction 37 Pin Signal

MODE_1
GND

RxD/TxD+
RxD/TxD–

TxCE/TxC+
TxCE/TxC–

TxD/RxD+
TxD/RxD–

CTS/RTS+
CTS/RTS–

TxC/RxC+
TxC/RxC–

RTS/CTS+
RTS/CTS–

Shorting group – – –

Twisted pair no. 11 <—

<—

Twisted pair no. 7 —>

—>

Twisted pair no. 6 —>

—>

Twisted pair no. 1 <—

<—

Twisted pair no. 9 —>

—>

Twisted pair no. 5 —>

—>

J2-4
J2-22

J2-5
J2-23

J2-6
J2-24

J2-7
J2-25

J2-8
J2-26

J2-9
J2-27

SD+
SD–

ST+
ST–

RD+
RD–

RS+
RS–

RT+
RT–

CS+
CS–

J1-29
J1-30

J1-7
J1-8

J1-3
J1-4

J1-5
J1-6

J1-26
J1-25

J1-15
J1-16

1. Any pin not referenced is not connected.

NIL/LL
Circuit_GND

DTR/DSR+
DTR/DSR–

DSR/DTR+
DSR/DTR–

DCD/DCD+
DCD/DCD–

RxC/TxCE+
RxC/TxCE–

Circuit_GND
Circuit_GND

Twisted pair no. 12 —>

Twisted pair no. 4 —>

Twisted pair no. 2 <—

Twisted pair no. 3 —>

Twisted pair no. 10 <—

Twisted pair no. 8 _

–

—>

<—

—>

<—

_

J2-10
J2-37

J2-11
J2-29

J2-12
J2-30

J2-13
J2-31

J2-17
J2-35

J2-19
J2-20

LL
SC

DM+
DM–

TR+
TR–

RR+
RR–

TT+
TT–

SG
RC

A-10

CRBRIM-W/T

Serial Cable Assemblies and Pinouts

A.2.4 V.35

Figure A-4 shows the V.35 cable assembly; Table A-7 lists the DTE pinout; Table
A-8 lists the DCE pinout. Arrows indicate signal direction: —> indicates DTE to
DCE, and <— indicates DCE to DTE.

J1-46
J1-45
J1-16
J1-15

J1-1
J1-30
J1-31
J1-60

60-pin connector (J1)

Connectors are not to scale

15-pin connector (J2)

Figure A-4. V.35 Cable Assembly

Table A-7. V.35 DTE Cable Pinout

(DB-60 to Winchester-Type 34 Pin)

J2-B
J2-D
J2-A
J2-C



J2-KK
J2-MM
J2-LL
J2-NN


H1975

1

60 Pin

J1-49
J1-48

J1-50
J1-51
J1-52

J1-53
J1-54
J1-55
J1-56

J1-46 Shield_GND Single – J2-A Frame GND

Signal Note Direction 34 Pin Signal

MODE_1
GND

MODE_0
GND
MODE_DCE

TxC/NIL
RxC_TxCE
RxD/TxD
GND

Hardware User’s Guide

Shorting Group – – –

Shorting Group – – –

Shorting Group – – –

Hardware Installation Guide

A-11

11

Appendix A: Cabling Specifications

Table A-7. V.35 DTE Cable Pinout

(DB-60 to Winchester-Type 34 Pin) (Continued)

60 Pin

J1-45
Shield

J1-42
Shield

J1-35
Shield

J1-34
Shield

J1-33
Shield

J1-43
Shield

J1-44
Shield

J1-18
J1-17

1

Circuit_GND

–
RTS/CTS

–
CTS/RTS

–
DSR/DTR

–
DCD/LL

–
DTR/DSR

–
LL/DCD

–
TxD/RxD+

TxD/RxD–

Signal Note Direction 34 Pin Signal

Twisted pair no. 12 –

–

Twisted pair no. 9 —>

–

Twisted pair no. 8 <—

–

Twisted pair no. 7 <—

–

Twisted pair no. 6 <—

–

Twisted pair no. 10 —>

–

Twisted pair no. 11 —>

–

Twisted pair no. 1 —>

—>

J2-B
Shield

J2-C
Shield

J2-D
Shield

J2-E
Shield

J2-F
Shield

J2-H
Shield

J2-K
Shield

J2-P
J2-S

Circuit GND
–

RTS
–

CTS
–

DSR
–

RLSD
–

DTR
–

LT
–

SD+
SD–

J1-28
J1-27

J1-20
J1-19

J1-26
J1-25

J1-24
J1-23

1. Any pin not referenced is not connected.

RxD/TxD+
RxD/TxD–

TxCE/TxC+
TxCE/TxC–

RxC/TxCE+
RxC/TxCE–

TxC/RxC+
TxC/RxC–

Twisted pair no. 5 <—

Twisted pair no. 2 —>

Twisted pair no. 4 <—

Twisted pair no. 3 <—

<—

—>

<—

<—

J2-R
J2-T

J2-U
J2-W

J2-V
J2-X

J2-Y
J2-AA

RD+
RD–

SCTE+
SCTE–

SCR+
SCR–

SCT+
SCT–

A-12

CRBRIM-W/T

Serial Cable Assemblies and Pinouts

Table A-8. V.35 DCE Cable Pinout
(DB-60 to Winchester-Type 34 Pin)

60 Pin

J1-49
J1-48

J1-50
J1-51

J1-53
J1-54
J1-55
J1-56

J1-46 Shield_GND Single – J2-A Frame GND
J1-45

Shield
J1-35

Shield
J1-42

Shield

1

MODE_1
GND

MODE_0
GND

TxC/NIL
RxC_TxCE
RxD/TxD
GND

Circuit_GND
–

CTS/RTS
–

RTS/CTS
–

Signal Note Direction 34 Pin Signal

Shorting Group – – –

Shorting Group – – –

Shorting Group – – –

Twisted pair no. 12 –

–

Twisted pair no. 8 <—

–

Twisted pair no. 9 —>

–

J2-B
Shield

J2-C
Shield

J2-D
Shield

Circuit GND
–

RTS
–

CTS
–

J1-43
Shield

J1-44
Shield

J1-34
Shield

J1-33
Shield

J1-28
J1-27

J1-18
J1-17

DTR/DSR
–

LL/DCD
–

DSR/DTR
–

DCD/LL
–

RxD/TxD+
RxD/TxD–

TxD/RxD+
TxD/RxD–

Twisted pair no. 10 —>

–

Twisted pair no. 11 —>

–

Twisted pair no. 7 <—

–

Twisted pair no. 6 <—

–

Twisted pair no. 5 <—

<—

Twisted pair no. 1 —>

—>

J2-E
Shield

J2-F
Shield

J2-H
Shield

J2-K
Shield

J2-P
J2-S

J2-R
J2-T

DSR
–

RLSD
–

DTR
–

LT
–

SD+
SD–

RD+
RD–

Hardware User’s Guide

Hardware Installation Guide

A-13

13

Appendix A: Cabling Specifications

Table A-8. V.35 DCE Cable Pinout

(DB-60 to Winchester-Type 34 Pin) (Continued)

60 Pin

J1-26
J1-25

J1-22
J1-21

J1-20
J1-19

1. Any pin not referenced is not connected.

1

RxC/TxCE+
RxC/TxCE–

NIL/RxC+
NIL/RxC–

TxCE/TxC+
TxCE/TxC–

Signal Note Direction 34 Pin Signal

Twisted pair no. 4 <—

<—

Twisted pair no. 3 —>

—>

Twisted pair no. 2 —>

—>

J2-U
J2-W

J2-V
J2-X

J2-Y
J2-AA

SCTE+
SCTE–

SCR+
SCR–

SCT+
SCT–

A.2.5 X.21

Figure A-5 shows the X.21 cable assembly; Table A-9 lists the DTE pinout; Table
A-12 lists the DCE pinout. Arro ws indicate signal direction: —> indicates DTE to
DCE, and <— indicates DCE to DTE.

J1-46
J1-45
J1-16
J1-15

60-pin connector (J1)

15-pin connector (J2)

J2-8
J2-15


J1-1
J1-30
J1-31
J1-60

Figure A-5. X.21 Cable Assembly

A-14

Connectors are not to scale

H1974

J2-9
J2-1


CRBRIM-W/T

Serial Cable Assemblies and Pinouts

Table A-9. X.21 DTE Cable Pinout (DB-60 to DB-15)

60 Pin

J1-48
J1-47

J1-51
J1-52

J1-46 Shield_GND Single – J2-1 Shield GND
J1-11

J1-12
J1-9

J1-10
J1-28

J1-27
J1-1

J1-2
J1-26

J1-25

1

GND
MODE_2

GND
MODE_DCE

TxD/RxD+
TxD/RxD–

RTS/CTS+
RTS/CTS–

RxD/TxD+
RxD/TxD–

CTS/RTS+
CTS/RTS–

RxC/TxCE+
RxC/TxCE–

Signal Note Direction 15 Pin Signal

Shorting Group - – –

Shorting Group – – –

Twisted pair no. 3 —>

—>

Twisted pair no. 2 —>

—>

Twisted pair no. 6 <—

<—

Twisted pair no. 1 <—

<—

Twisted pair no. 5 <—

<—

J2-2
J2-9

J2-3
J2-10

J2-4
J2-11

J2-5
J2-12

J2-6
J2-13

Transmit+
Transmit–

Control+
Control–

Receive+
Receive–

Indication+
Indication–

Timing+
Timing–

J1-15
Shield

1. Any pin not referenced is not connected.

Control_GND–Twisted pair no. 4 –

J2-8

–

Shield

Control_GND
–

Hardware User’s Guide

Hardware Installation Guide

A-15

15

Appendix A: Cabling Specifications

Table A-10. X.21 DCE Cable Pinout (DB-60 to DB-15)

60 Pin

J1-48
J1-47

J1-46 Shield_GND Single – J2-1 Shield GND
J1-28

J1-27
J1-1

J1-2
J1-11

J1-12
J1-9

J1-10
J1-24

J1-23
J1-15

Shield

1

Signal Note Direction 15 Pin Signal

GND
MODE_2

RxD/TxD+
RxD/TxD–

CTS/RTS+
CTS/RTS–

TxD/RxD+
TxD/RxD–

RTS/CTS+
RTS/CTS–

TxC/RxC+
TxC/RxC–

Control_GND–Twisted pair no. 5 –

Shorting Group – – –

Twisted pair no. 6 <—

Twisted pair no. 1 <—

Twisted pair no. 3 —>

Twisted pair no. 2 —>

Twisted pair no. 4 —>

<—

<—

—>

—>

—>

–

J2-2
J2-9

J2-3
J2-10

J2-4
J2-11

J2-5
J2-12

J2-6
J2-13

J2-8
Shield

Transmit+
Transmit–

Control+
Control–

Receive+
Receive–

Indication+
Indication–

Timing+
Timing–

Control GND
–

1. Any pin not referenced is not connected.

A-16

CRBRIM-W/T

Appendix B

Virtual Configuration Register

This appendix describes the CRBRIM-W/T virtual configuration register, the
factory default settings, and procedures for changing settings.

The following information is included in this appendix:

• Virtual configuration register settings

• Explanation of boot field

• Changing configuration register settings

• Virtual configuration register bit meanings

• Default boot filenames

• Virtual configuration register settings for broadcast address destination

• System console terminal baud rate settings

• Enabling booting from Flash

• Copying to Flash

B.1 Virtual Configuration Register Settings

The CRBRIM-W/T has a 16-bit virtual configuration register, which is written
into the nonvolatile random-access memory (NVRAM). Some reasons for
changing the virtual configuration register settings are:

• Set and display the configuration register value

• Force the system into the bootstrap program

• Select a boot source and default boot filename

• Enable or disable the Break function

• Control broadcast addresses

• Set the console terminal baud rate

• Load operating software from ROM

• Enable booting from a Trivial File Transfer Protocol (TFTP) server

Hardware User’s Guide

Hardware Installation Guide

B-1

B-1

Appendix B: Virtual Configuration Register

Table B-1 lists the meaning of each of the virtual configuration memory bits, and
Table B-2 defines the boot field names.

To avoid possibly hanging the CRBRIM-W/T, remember that valid
configuration register settings might be combinations of settings

!

CAUTION

and not just the individual settings listed in Table B-1. For
example, the factory default value of 0x2102 is a combination of
settings.

Table B-1. Virtual Configuration Register Bit Meanings

Bit No.

00 to 03 0x0000 to

06 0x0040 Causes system software to ignore NVRAM

07 0x0080 OEM bit enabled
08 0x0100 Break disabled
10 0x0400 IP broadcast with all zeros
11 to 12 0x0800 to

13 0x2000 Boot default ROM software if network boot

14 0x4000 IP broadcasts do not have net numbers
15 0x8000 Enable diagnostic messages and ignore

1

Hex Meaning

Boot field (see Table B-2)

0x000F

contents

Console line speed

0x1000

fails

NVRAM contents

1. The factory default value for the configuration register is 0x2102. This value is a
combination of the following: bit 13 = 0x2000, bit 8 = 0x0100, and bits 00 through
03 (see Table B-2) = 0x0002.

B-2

CRBRIM-W/T

Virtual Configuration Register Settings

Table B-2. Explanation of Boot Field

(Configuration Register Bits 00 to 03)

Boot
Field

00 Stays at the system bootstrap prompt
01 Boots system image in system ROM
02 to 0F Specifies a default netboot filename

Enables boot system commands that override default netboot
filename

Meaning

B.1.1 Changing Configuration Register Settings

Some common reasons to modify the value of the virtual configuration register
follow:

• Recover a lost password

• Change the console baud rate

• Enable or disable Break

• Allow you to manually boot the operating system using the b command at the

bootstrap program (ROM monitor) prompt

• Force the CRBRIM-W/T to boot automatically from the system bootstrap
software (boot ROM image) or from its system image in Flash memory, and
read any boot system commands that are stored in the configuration file in
NVRAM. If the CRBRIM-W/T finds no boot system commands, it uses the
configuration register value to form a filename from which to netboot a
default system image stored on a network server. (See Table B-3.)

Hardware User’s Guide

Hardware Installation Guide

B-3

3

Appendix B: Virtual Configuration Register

To change the configuration register while running the system software, follow
these steps:

1. Enter the enable command and your password to enter the privile ged lev el, as

follows:

Router> enable
Password:
Router#

2. At the privileged-le v el system prompt (CRBRIM-W/T #), enter the command

configure terminal.

Router# conf term
Enter configuration commands, one per line.
Edit with DELETE, CTRL/W, and CTRL/U; end with CTRL/Z

You will be prompted as shown in the following example:

3. To set the contents of the configuration register, enter the config-register

value configuration command where value is a hexadecimal number preceded
by 0x (see Table B-1), as in the following:

config-register 0xvalue

(The virtual configuration register is stored in nonvolatile memory.)

4. Exit the configuration mode by entering Ctrl-Z. The new value settings will
be saved to memory; however, the new settings do not take effect until the
system software is reloaded by rebooting the CRBRIM-W/T.

5. To display the configuration register value currently in effect and the value
that will be used at the next reload, enter the show version EXEC command.
The value will be displayed on the last line of the screen display as in the
example following:

Configuration register is 0x142 (will be 0x102 at next reload)

6. Reboot the CRBRIM-W/T. The new value tak es ef fect. Configuration re gister
changes take effect only when the server restarts: such as when you switch the
power off and on or when you issue a reload command from the console.

B-4

CRBRIM-W/T

Virtual Configuration Register Settings

B.1.2 Virtual Configuration Register Bit Meanings

The lowest four bits of the virtual configuration register (bits 3, 2, 1, and 0) form
the boot field. (See Table B-2.) The boot field specifies a number in binary. If you
set the boot field value to 0, you must boot the operating system manually by
entering the b command at the bootstrap prompt as follows:

> b [tftp] flash filename

Definitions of the various b command options follow:

• b—Boots the default system software from ROM

• b flash—Boots the first file in Flash memory

• b filename [host]—Netboots using TFTP

• b flash [filename]—Boots the file (filename) from Flash memory
For more information about the b [tftp] flash filename command, refer to

Cabletron Systems’ CRM-DOC Set, a compilation of Cisco Systems® Router
Products Configuration and Reference Guides.

If you set the boot field value to a value of 0x2 through 0xF, and there is a valid
system boot command stored in the configuration file, then the CRBRIM-W/T
boots the system software as directed by that value. If you set the boot field to any
other bit pattern, the CRBRIM-W/T uses the resulting number to form a default
boot filename for netbooting. (See Table B-3.)

In the following example, the virtual configuration register is set to boot the
CRBRIM-W/T from Flash memory and to ignore Break at the next reboot of the
CRBRIM-W/T:

Router# conf term
Enter configuration commands, one per line.
Edit with DELETE, CTRL/W, and CTRL/U; end with CTRL/Z
config-register 0x102
boot system flash
^Z
Router#

[filename]

The server creates a default boot filename as part of the automatic configuration
processes. To form the boot filename, the server starts with cisco and links the
octal equivalent of the boot field number, a dash, and the processor-type name.
Table B-3 lists the default boot filenames or actions for the processor.

Hardware User’s Guide

Hardware Installation Guide

B-5

5

Appendix B: Virtual Configuration Register

A boot system command in the router configuration in NVRAM

NOTES

overrides the default netboot filename.

Table B-3. Default Boot Filenames

Action/File Name Bit 3 Bit 2 Bit 1 Bit 0

bootstrap mode 0000
ROM software 0001
cisco2-igs 0010
cisco3-igs 0011
cisco4-igs 0100
cisco5-igs 0101
cisco6-igs 0110
cisco7-igs 0111
cisco10-igs 1000
cisco11-igs 1001
cisco12-igs 1010
cisco13-igs 1011
cisco14-igs 1100
cisco15-igs 1101
cisco16-igs 1110
cisco17-igs 1111

B-6

CRBRIM-W/T

Virtual Configuration Register Settings

Bit 8 controls the console Break key. Setting bit 8 (the factory default) causes the
processor to ignore the console Break key. Clearing bit 8 causes the processor to
interpret the Break key as a command to force the system into the bootstrap
monitor, thereby halting normal operation. A break can be sent in the first 60
seconds while the system reboots, regardless of the configuration settings.

Bit 10 controls the host portion of the Internet broadcast address. Setting bit 10
causes the processor to use all zeros; clearing bit 10 (the factory default) causes
the processor to use all ones. Bit 10 interacts with bit 14, which controls the
network and subnet portions of the broadcast address. Table B-4 shows the
combined effect of bits 10 and 14.

Table B-4. Configuration Register Settings for

Broadcast Address Destination

Bit 14 Bit 10

off off <ones> <ones>
off on <zeros> <zeros>
on on <net> <zeros>
on off <net> <ones>

Address

(<net> <host>)

Bits 11 and 12 in the configuration register determine the baud rate of the console
terminal. Table B-5 shows the bit settings for the four available baud rates. (The
factory-set default baud rate is 9600.)

Table B-5. System Console Terminal Baud Rate Settings

Baud Bit 12 Bit 11

9600 0 0

Hardware User’s Guide

4800 0 1
1200 1 0
2400 1 1

Hardware Installation Guide

B-7

7

Appendix B: Virtual Configuration Register

Bit 13 determines the server response to a bootload failure. Setting bit 13 causes
the server to load operating software from R OM after five unsuccessful attempts to
load a boot file from the network. Clearing bit 13 causes the server to continue
attempting to load a boot file from the network indefinitely. By factory default, bit
13 is cleared to 0.

B.1.3 Enabling Booting from Flash

To enable booting from Flash, set configuration register bits 3, 2, 1, and 0 to a
value between 2 and 15 in conjunction with the boot system flash [filename]
configuration command.

To enter the configuration mode, while in the system software image and specify a
Flash filename from which to boot, enter the configure terminal command at the
enable prompt as in the example following:

Router# configure terminal
Enter configuration commands, one per line.
Edit with DELETE, CTRL/W, and CTRL/U; end with CTRL/Z

boot system flash [

filename

]

To disable break and enable the boot system flash command, enter the config­register command with the value shown in the example following:

Router# config term
Enter configuration commands, one per line.
Edit with DELETE, CTRL/W, and CTRL/U; end with CTRL/Z
config-reg 0x2102
^Z
Router#

B.1.4 Copying to Flash

Copying a new image to Flash might be required whenever a new image or
maintenance release becomes available. To copy a new image into Flash (write to
Flash), you must first reboot from ROM and then copy the new image into Flash.
You cannot copy a new image into Flash while the system is running from Flash.
Use the copy tftp flash command for the copy procedure.

B-8

CRBRIM-W/T

Appendix C

Bootstrap Program

The bootstrap program helps isolate or rule out hardware problems encountered
when installing the CRBRIM-W/T. A summary of the bootstrap diagnostic tests
and command options is provided.

C.1 Entering the Bootstrap Program

The bootstrap diagnostics help initialize the processor hardware and boot the main
operating system software. If you set the software configuration register boot field
(bits 3, 2, 1, and 0) to zero, you can start the server in standalone bootstrap mode.
The bootstrap mode prompt is an angle bracket (>).

To enable the Break key, and to default to booting in the bootstrap mode, at the
bootstrap prompt (>), set the configuration register to 0x0 by entering the
following:

> o/r 0x0

See Table C-1 for an explanation of the o/r command.

For more information on the virtual configuration register, refer to

NOTE

While running the system software, you can reset the configuration register to 0x0
by entering configuration mode, and then entering the following configuration
command:

config-register 0x0

Appendix B, “Virtual Configuration Register.”

Hardware User’s Guide

Hardware Installation Guide

C-1

C-1

Appendix C: Bootstrap Program

The new configuration register v alue, 0x0, tak es ef fect after the router is rebooted.
If the configuration is set to 0x0, the system will have to be manually booted each
time the router is rebooted.

Break (system interrupt) is always enabled for 60 seconds after

TIP

rebooting the system, even if br eak is configur ed to be off by setting
the configuration register. During the 60-second window, you can
break to the bootstrap program prompt.

C.1.1 Available Bootstrap Commands

After you are in the bootstrap mode, enter ? at the > prompt to display a list of
available commands and options, as follows:

?

$Toggle cache state
B [filename][TFTP Server IP address | TFTP Server Name]
Load and execute system image from ROM or from
TFTP server
C [address]Continue [optional address]
D /S M L VDeposit value V of size S into location L with
modifier M
E /S M LExamine location L with size S with modifier M
G [address]Begin execution
HHelp for commands
IInitialize
KDisplays Stack trace
L [filename][TFTP Server IP address | TFTP Server Name]
Load system image from ROM or from TFTP server,
but do not begin execution
OShow software configuration register option
settings
PSet break point
SSingle step next instruction
T functionTest device (? for help)
Deposit and Examine sizes may be B (byte), L (long) or S
(short).
Modifiers may be R (register) or S (byte swap).
Register names are: D0-D7, A0-A7, SS, US, SR, and PC.

C-2

CRBRIM-W/T

Entering the Bootstrap Program

The following system bootstrap commands are among the most useful:

• Boot—The b command with no argument reboots the system and boots the

default software from ROM as defined by the lower four bits of the
configuration register which form the boot field. Y ou can include an argument,
filename, to specify a file to be booted over the network using the Trivial File
Transfer Protocol (TFTP). You can also include a second argument, host,
which is the Internet address or name of a particular server host. You must
enter the i command (explanation follows) and press Return before entering
b. The various forms of the b command follow:

- b—Boots the default system software from ROM

- b filename [host]—Netboots using TFTP

- b flash—Boots the first file in Flash memory

- b flash [filename]—Boots the file (filename) from Flash memory

To prevent the router from automatically netbooting or booting from anywhere,
enter the o/r 0x0 command.

• Continue—The c command allows you to exit the bootstrap mode without

rebooting the router after you press the Break key while running the system
software image.

• Help—The h command prints a summary of the bootstrap commands to the
console screen. This is the same output produced by entering ?.

• Initialize—The i command causes the bootstrap program to reinitialize the
hardware, clear the contents of memory, and boot the system if so directed by
the boot field in the virtual configuration register. (It is best to use the i
command before running any tests or booting software.)

• Display Stack Trace—The k command displays a stack trace of the last
running system software. This stack trace will be useful as a diagnostic
reading in the event of a problem such as an unexpected system crash.

• Display/Reset Virtual Configuration Register—The o command displays the
virtual configuration register. The o command used with the /r option will
reset the configuration register and cause the system software image to ignore
the system configuration information in NVRAM (sets the ignore NVRAM
contents bit, 0x0040).

Hardware User’s Guide

Hardware Installation Guide

C-3

3

Appendix C: Bootstrap Program

• To reset, enter the following at the > prompt:

o/r

Table C-1 lists additional o command options.

Table C-1. o Command Options

Monitor

Command

o Displays the virtual configuration register, currently in effect,

with a description of the bits

o/r Resets the virtual configuration register as follows:

9600 baud console UART speed
Break/abort has no effect
Ignore the system configuration in NVRAM
Boot from ROM

o/r

0xvalue

Sets the virtual configuration register to the (hex) value,

value

Function

To automatically reboot the router, enter the i command after entering the o/r
command.

To enable the router to read the nonvolatile RAM configuration,

NOTE

clear the ignore-NVRAM- contents bit (0x0040) with the config­register command after using the o/r command.

• Memory/Bus Diagnostic—The t m command runs the memory test. By

default, the memory test examines processor main memory.

To prevent losing your configuration, save the configuration in a
file on a host in your network before testing.

!

CAUTION

C-4

CRBRIM-W/T

Entering the Bootstrap Program

• To test memory, enter the t command with the m option at the > prompt, as
follows:

t m

To use the default addresses and select the default tests, press the Return key
after each prompt displayed.

The time taken to run a diagnostic is memory-size dependent, but requires a
minimum of ten minutes. If the program encounters memory problems, it displays
appropriate error messages on the console terminal. Be sure to reinitialize the
processor before booting the system by entering i at the bootstrap prompt (>).

C.1.2 Running the Diagnostics

Follow these steps to run the bootstrap diagnostics:

1. Turn OFF the router.

2. Restart the router.

3. Within 60 seconds, press the Break key on the console terminal to force the
server into the bootstrap program. Wait for the server to print the two-line
banner message and for the angle bracket (>) prompt to appear.

Hardware User’s Guide

Hardware Installation Guide

C-5

5

INDEX

Symbols

$ command (toggle cache state) C-2
? command (available bootstrap

commands) C-2

A

adapters, RJ-45-to-DB-25 A-2
approved vendor list, DRAM SIMMs 6-3
audience 1-2
AUI port-location 3-5
auxiliary port

pinout and signals A-2

B

b command (boot) C-3
baud-rate settings B-7
boot ROM memory capacity 2-4
booting

from Flash B-8

the system C-3
bootload-failure response B-8
bootstrap

clear memory contents C-3

commands C-2

diagnostics C-1–C-5

entering the program C-1

exiting C-3

prompt (>) C-1

stack trace, system software C-3
Break key (interrupt) B-7, C-1
broadcast address destination,

configuration register settings B-7

C

c command (continue) C-3
cable

assemblies A-2–A-16
distance limitations 3-2
Ethernet

preparing connections 3-5

pinouts

EIA-530 A-3
RS-232 A-5
RS-449 A-8
V.35 A-11
X.21 A-14

serial

connections 4-7

preparing connections 3-6
specifications A-1
twisted-pair, interference

considerations 3-4

caution

ESD

wrist-strap safety 3-2
exceeding RS-232 distance

limitations 3-3

hanging the router B-2

changing configuration settings B-3
Channel Service Unit/Digital Service Unit

See CSU/DSU

chassis

front view 2-1
specifications 2-2

clear memory contents C-3

Hardware User’s Guide Index-1

INDEX

commands

$ (toggle cache state) C-2
? (list available commands) C-2
b (boot) B-5, C-3
boot system B-6
boot system flash B-8
boot system flash filename B-8
bootstrap C-3
bootstrap diagnostics C-1
Break (interrupt) B-7
c (continue) C-3
config-register B-4, B-5, B-8, C-1
configure terminal B-4, B-5
enable 6-8, B-4
Flash-related B-5, C-3
h (help) C-3
i (initialize) 6-8, C-3, C-4
k (display stack trace) C-3
m option to the t command C-5
o (display virtual configuration

register) C-3
o/r (reset) 6-8, C-4
reload B-4
show configuration 6-7
show version 6-8, B-4
t (test) C-4, C-5

configuration

memory types 2-4
register

boot field B-5
resetting C-3
settings

changing B-3
displaying C-4

connections

serial interface ports 4-7

connections-external 4-7
connectors

cables A-3–A-16

console port

cable considerations 3-2
pinout and signals A-2

settings 3-5, B-7
conventions, publication 1-3
copying to Flash B-8
CRBRIM-W/T-installation 4-2
CSU/DSU

connections

serial ports 4-7

D

data communications equipment

See DCE
data terminal equipment

See DTE
DB-25 adapters A-2
DCE

cable pinouts A-3–A-14
diagnostics, running C-5
dimensions, chassis 2-2
displaying

stack trace C-3

virtual configuration register C-3
distance limitations 3-3
document

conventions 1-3

objectives and organization 1-2
Document Conventions 1-3
DRAM SIMM

approved-vendor list 6-3

installation 6-3
DRAM SIMM-installation 6-1
DTE

auxiliary port 3-5

cable pinouts A-3–A-14
dynamic random-access memory

See DRAM

Index-2 CRBRIM-W/T

INDEX

E

EIA-530 pinout and signals A-3
electromagnetic interference

See EMI
Electrostatic discharge 3-1
electrostatic discharge

See ESD
EMI, cabling considerations 3-4
enable command 6-8
enabling booting from Flash B-8
entering the bootstrap program C-1
error messages, memory 6-7
ESD prevention 3-1
exiting the bootstrap mode C-3
external connections 4-7

F

filenames, netbooting B-6
Flash

booting from B-8

copying to B-8

memory size 2-4

replacing SIMMs 6-5
FLASH-memory description 2-3
forcing the server into bootstrap mode C-5

H

h command (help, in bootstrap) C-3
hardware

reinitialization with the i command C-

3
Help 1-5
humidity specification 2-2

DRAM SIMMs 6-3
parts and equipment required 4-1
preparations 3-1
system code SIMMs 6-5

interface

pinouts

EIA-530 A-3
RS-232 A-5
RS-449 A-8
V.35 A-11
X.21 A-14

interference considerations 3-4

K

k command (display stack trace) C-3
key, Break (interrupt) B-7, C-1

L

LEDs, used for troubleshooting 5-2
loading software from Flash B-8

M

maintenance procedures 6-1
manufacturers, DRAM SIMMs 6-3
memory

boot ROM, NVRAM, packet,

primary, shared, system code 2-3
clearing contents C-3
configurations 2-4, 6-2
diagnostic C-4
error messages 6-7

modem connection 4-7

N

I

i command (initialize and reboot) 6-8, C-3
ignore NVRAM contents C-4
indicators, LED 5-2
Installation

Installing a BRIM in a Hub 4-6

installation

Hardware User’s Guide Index-3

netbooting B-5, C-3
network

interface

LEDs 5-3
troubleshooting 5-2

nonvolatile random-access memory

See NVRAM

INDEX

NVRAM

ignore contents C-4
size 2-3

NVRAM-memory description 2-3

O

o command (configuration register

options) C-3
o/r command (reset) 6-8, C-4
overview, system 2-1

P

packet-memory description 2-3
password, recovering 6-7
pinouts

console and auxiliary ports A-2

RS-232 A-5

RS-449 A-8

serial cable A-3–A-14

V.35 A-11

X.21 A-14
power

specifications 2-2
preparing for installation 3-1
primary memory 2-3
printing summary of bootstrap commands

(h command) C-3
problem solving 5-1
procedures

copying to Flash B-8

entering bootstrap diagnostics

program C-1

installing 4-1–4-7

primary memory DRAM

SIMMs 6-3
maintenance 6-1–6-7
making external connections 4-7
recovering from a lost password 6-7
replacing

system-code SIMMs 6-5

running diagnostics C-5
processor specification 2-2
programmable read-only memory

See PROM
PROM-replacement procedure 6-5

R

radio frequency interference

See RFI
reading LED indicators 5-2
recovering a lost password 6-7
reinitializing hardware C-3
reload command B-4
replacing

DRAM SIMMs 6-3

Flash memory SIMMs 6-5
resetting virtual configuration register C-3
RFI, interference considerations 3-4
ROM-memory description 2-3
RS-232

distance limitations 3-3

pinout and signals A-5
RS-449

distance limitations 3-3

pinout and signals A-8
running diagnostics C-5

S

safety

ESD 3-2
serial

cables, pinouts and signals A-3–A-14

interface port

connections 4-7

preparations 3-6
Serial Connections-speed 3-2
Serial interface-distance limitations 3-2
settings, console port 3-5
shared memory 2-3

See also packet memory

Index-4 CRBRIM-W/T

INDEX

signals

RS-232 A-5
RS-449 A-8
V.35 A-11
X.21 A-14

SIMM

DRAM installation 6-2
replacement 6-4

single in-line memory module

See SIMM

software

displaying stack trace C-3
replacing SIMMs 6-5

specifications

cable A-1

chassis 2-2
stack trace, displaying C-3
static electricity prevention 3-1
system

banner 6-3

code

memory size 2-4

replacing SIMMs 6-5
diagnostics C-5
OK LED 5-2
overview 2-1
software

booting from Flash B-8

displaying stack trace C-3

replacing SIMMs 6-5
specifications 2-2
troubleshooting 5-1

System Code (from FLASH) 3-2

T

t command (test) C-4
temperature specification 2-2
tools required

for DRAM SIMM replacement 6-2
for installation 4-1
for system code SIMM replacement

6-5

twisted-pair cable, interference

considerations 3-4

V

V.35

distance limitations (same as RS-449)

3-3

pinout and signals A-11

virtual configuration register

displaying and resetting C-3
functions B-1–B-8

X

X.21

distance limitations (same as RS-449)

3-3

pinout and signals A-14

Hardware User’s Guide Index-5