Cabletron Systems NBR-220 User manual

NBR-220 TWO PORT BRIDGE WITH LANVIEW®
RECEIVE
TRANSMIT
COLLISION
STAND BY
PORT
B A
PWR
CPU
COM
RESET PORT B PORT A
EPIM-A PWR EPIM-A PWR
NBR-420 MULTI PORT BRIDGE ROUTER WITH LANVIEW®
RECEIVE
TRANSMIT
COLLISION
STAND BY
PORT
B A
PWR
CPU
COM 2 COM 1
DISPLAY RESET PORT B PORT A
PORT F PORT E
EPIM-A PWR EPIM-A PWR
NBR-620 MULTI PORT BRIDGE ROUTER WITH LANVIEW®
RECEIVE
TRANSMIT
COLLISION
STAND BY
PORT
D C B A
PWR
CPU
COM 2 COM 1
DISPLAY RESET PORT D PORT C PORT B PORT A
PORT F PORT E
EPIM-A PWR EPIM-A PWR EPIM-A PWR EPIM-A PWR
BRIM-A100
STY
LNK
XMT
RCV
LNK YEL STB DSR LNK
T1/FT1
TST RED SYN CTS TST
SYNC
BRIM-WT1
BRIM-A100
STY
LNK
XMT
RCV
1092_01
LNK YEL STB DSR LNK
T1/FT1
TST RED SYN CTS TST
SYNC
BRIM-WT1
NBR-220, NBR-420, AND NBR-620
INSTALLATION GUIDE

NBR-SERIES Installation Guide i
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.
 Copyright 1996 by Cabletron Systems, Inc., P.O. Box 5005, Rochester, NH 03866-5005
All Rights Reserved
Printed in the United States of America
Order Number: 9031092-01 May 1996
SPECTRUM , LANVIEW , MicroMMAC , and BRIM are registered trademarks and Element
Manager , EPIM , EPIM-A , EPIM-F1 , EPIM-F2 , EPIM-F3 , EPIM-T , EPIM-X , FOT-F , FOT-F3 ,
HubSTACK , NBR-220 , NBR-420 , NBR-620 , SEH , SEHI , and TMS-3 are trademarks of Cabletron
Systems, Inc.
All other product names mentioned in this manual may be trademarks or registered trademarks of
their respective companies.
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 device must accept any
interference received, including interference that may cause undesired operation.
NOTE: This equipment has been tested and found to comply with the limits for a Class A 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: Changes or modifications made to this device which are not expressly approved by the
party responsible for compliance could void the user’s authority to operate the equipment.
Printed on Recycled Paper

Notice
ii NBR-SERIES Installation Guide
DOC NOTICE
This digital apparatus does not exceed the ClassA 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.
VCCI NOTICE
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.
CABLETRON SYSTEMS, INC. PROGRAM LICENSE AGREEMENT
IMPORTANT: Before utilizing this product, carefully read this License Agreement.
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 WARRANTYAND DISCLAIMER OF LIABILITY. IFYOU DO NOT
AGREE TO THE TERMS OF THIS AGREEMENT, PROMPTLY RETURN THE UNUSED
PRODUCT TO THE PLACE OF PURCHASE FOR A FULL REFUND.

Notice
NBR-SERIES Installation Guide iii
CABLETRON SOFTWARE PROGRAM LICENSE
1. LICENSE. You have the right to use only the one (1) copy of the Program provided 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.
2. OTHER RESTRICTIONS. You may not reverse engineer, decompile, or disassemble the
Program.
3. APPLICABLE LAW. This License Agreement shall be interpreted and governed 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.
EXCLUSION OF WARRANTY AND DISCLAIMER OF LIABILITY
1. EXCLUSION OF WARRANTY. Except as may be specifically provided by 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 EXPRESSED OR IMPLIED, INCLUDING
BUT NOT LIMITED TO IMPLIED WARRANTIES OF MERCHANTABILITY AND
FITNESS FOR A PARTICULAR PURPOSE, WITH RESPECT TO THE PROGRAM, THE
ACCOMPANYING WRITTEN MATERIALS, AND ANY ACCOMPANYING HARDWARE.
2. NO LIABILITY FOR CONSEQUENTIAL DAMAGES. IN NO EVENT SHALL
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 WARRANTIES, IN SOME
INSTANCES THE ABOVE LIMITATIONS AND EXCLUSIONS MAY NOT APPLY TO
YOU.
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 52.227-7013 (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 Technical Data and Computer Software clause at
252.227-7013. Cabletron Systems, Inc., 35 Industrial Way, Rochester, New Hampshire 03867-0505.

Notice
iv NBR-SERIES Installation Guide
DECLARATION OF CONFORMITY
Application of Council Directive(s): 89/336/EEC
73/23/EEC
Manufacturer’s Name: Cabletron Systems, Inc.
Manufacturer’s Address: 35 Industrial Way
PO Box 5005
Rochester, NH 03867
European Representative Name: Mr. J. Solari
European Representative Address: Cabletron Systems Limited
Nexus House, Newbury Business Park
London Road, Newbury
Berkshire RG13 2PZ, England
Conformance to Directive(s)/Product Standards: EC Directive 89/336/EEC
EC Directive 73/23/EEC
EN 55022
EN 50082-1
EN 60950
Equipment Type/Environment: Networking Equipment, for use in a
Commercial or Light
Industrial
Environment.
We the undersigned, hereby declare that the equipment packaged with this notice conforms to
the above directives.
Manufacturer Legal Representative in Europe
Mr. Richard Michaud Mr. J. Solari
___________________________________ ___________________________________
Full Name Full Name
Manager of Engineering Services Managing Director - E.M.E.A.
___________________________________ ___________________________________
Title Title
Rochester, NH, USA Newbury, Berkshire, England
___________________________________ ___________________________________
Location Location

NBR-SERIES Installation Guide v
CONTENTS
CHAPTER 1 INTRODUCTION
1.1 Using This Manual.......................................................................1-2
1.2 NBR Features..............................................................................1-3
1.3 Conventions Used in This Document..........................................1-6
1.4 Related Manuals..........................................................................1-6
1.5 Getting Help.................................................................................1-7
CHAPTER 2 CONTROLS AND INDICATORS
2.1 LANVIEW LEDs...........................................................................2-2
2.2 RESET Button.............................................................................2-2
2.3 LCD Display.................................................................................2-2
CHAPTER 3 INSTALLATION
3.1 Unpacking the NBR.....................................................................3-1
3.2 Preparing the NBR for Installation...............................................3-2
3.2.1 Removing Chassis Cover ...............................................3-2
3.2.2 Setting Mode Switches ...................................................3-5
3.2.3 Setting NVRAM Reset Switch.........................................3-6
3.2.4 Installing SIMM Upgrades...............................................3-7
3.2.4.1 Installing FLASH SIMMs ................................3-7
3.2.4.2 Installing LDRAM and SDRAM SIMMs ..........3-9
3.2.5 Adding/Replacing EPIMs................................................3-9
3.2.6 Adding/Replacing BRIMs..............................................3-10
3.2.7 Testing the NBR ...........................................................3-11
3.3 Installing the NBR......................................................................3-12
3.3.1 Attaching the Strain-Relief Bracket...............................3-13
3.3.2 Rack Mounting the NBR ...............................................3-14
3.3.3 Free-Standing Installation.............................................3-15
3.4 Connecting the NBR to the Power Source................................3-15
3.5 Connecting the NBR to the Network..........................................3-17
3.5.1 Connecting a Twisted Pair Segment to an EPIM-T ......3-17
3.5.2 Connecting an AUI Cable to an EPIM-X.......................3-19
3.5.3 Connecting a Fiber Optic Cable to an EPIM-F1/F2
or EPIM-F33-20
3.5.4 Connecting a Thin-Net Segment to an EPIM-C............3-22
3.5.5 Connecting an AUI Cable to an EPIM-A.......................3-23

Contents
vi NBR-SERIES Installation Guide
CHAPTER 4 TROUBLESHOOTING
4.1 Using LANVIEW...........................................................................4-1
4.2 Troubleshooting Checklist............................................................4-4
4.3 Using the LCD..............................................................................4-6
4.3.1 Unsaved Initialization Messages.....................................4-7
4.3.2 Static System Messages.................................................4-7
4.3.3 Alarm Messages..............................................................4-9
4.3.4 Saved System Messages..............................................4-10
4.3.5 Failure or Error Messages.............................................4-12
4.4 Using the RESET Button ...........................................................4-12
APPENDIX A NBR SPECIFICATIONS
A.1 Operating Specifications............................................................. A-1
A.2 COM Port Pinouts....................................................................... A-2
A.3 Physical Properties ..................................................................... A-3
A.4 Environmental Requirements......................................................A-3
A.5 Certification................................................................................. A-3
A.6 Power Supply Requirements ......................................................A-3
APPENDIX B EPIM SPECIFICATIONS
B.1 EPIM Specifications.................................................................... B-1
B.2 EPIM-T........................................................................................ B-1
B.3 EPIM-F1/F2.................................................................................B-2
B.4 EPIM-F3...................................................................................... B-3
B.5 EPIM-C .......................................................................................B-5
B.6 EPIM-A and EPIM-X ................................................................... B-6
APPENDIX C NETWORK PLANNING AND CONFIGURATION
C.1 Network Cable Requirements.....................................................C-1
C.1.1 10BASE-T Twisted Pair Network....................................C-1
C.1.2 Multimode Fiber Optic Network ......................................C-3
C.1.3 Single Mode Fiber Optic Network...................................C-4
C.1.4 Thin-Net Network............................................................C-5
C.2 Transceiver Requirements..........................................................C-6
C.3 The NBR as a Multiport Router...................................................C-6
C.4 The NBR-420/NBR-620 and BRIMs ...........................................C-6

Contents
NBR-SERIES Installation Guide vii
APPENDIX D ADDITIONAL INFORMATION
D.1 NBR Overview.............................................................................D-1
D.2 Ethernet Channels A, B, C, and D...............................................D-2
D.3 Channels E and F........................................................................D-2
D.4 Bridging Functionality..................................................................D-3
INDEX

NBR-SERIES Installation Guide Page 1-1
CHAPTER 1
INTRODUCTION
The Cabletron Systems NBR-SERIES of Network Bridge Routers
(NBR-220, NBR-420, NBR-620)
provide bridging and routing solutions
for Ethernet, token ring, FDDI, ATM, or wide area networks. The
NBR-SERIES of standalone hubs consist of the following three models:
•
NBR-220 – two Ethernet Port Interface Module (EPIM) ports
•
NBR-420 – two EPIM ports, and two Bridge/Router Interface Module
(BRIM) ports
• NBR-620 – four EPIM ports, and two BRIM ports
Figure 1-1 The NBR-SERIES of Network Products
NOTE
This manual uses the term NBR to describe the NBR-220,
NBR-420, and NBR-620 unless otherwise specified.
NBR-220 TWO PORT BRIDGE WITH LANVIEW
®
RECEIVE
TRANSMIT
COLLISION
STAND BY
PORT
B A
PWR
CPU
COM
RESET
PORT B PORT A
EPIM-A PWR EPIM-A PWR
NBR-420 MULTI PORT BRIDGE ROUTER WITH LANVIEW
®
RECEIVE
TRANSMIT
COLLISION
STAND BY
PORT
B A
PWR
CPU
COM 2 COM 1
DISPLAY RESET
PORT B PORT A
PORT F PORT E
EPIM-A PWR EPIM-A PWR
NBR-620 MULTI PORT BRIDGE ROUTER WITH LANVIEW
®
RECEIVE
TRANSMIT
COLLISION
STAND BY
PORT
D C B A
PWR
CPU
COM 2 COM 1
DISPLAY RESET
PORT D PORT C PORT B PORT A
PORT F PORT E
EPIM-A PWR EPIM-A PWR EPIM-A PWR EPIM-A PWR
BRIM-A100
STY
LNK
XMT
RCV
LNK YEL STB DSR LNK
T1/FT1
TST RED SYN CTS TST
SYNC
BRIM-WT1
BRIM-A100
STY
LNK
XMT
RCV
1092_01
LNK YEL STB DSR LNK
T1/FT1
TST RED SYN CTS TST
SYNC
BRIM-WT1

Chapter 1: Introduction
Page 1-2 NBR-SERIES Installation Guide
This manual explains the following:
• Installing the NBR
• Connecting the NBR to an existing network
• Testing the NBR
• Troubleshooting any installation/operational problems
In addition,Appendices contain NBR and Ethernet Port Interface Module
(EPIM) environmental and operational specifications.
This manual serves as a simple installation and troubleshooting reference
guide for the NBR. For information regarding NBR out-of-band
management, refer to the
NBR-220, NBR-420, and NBR-620 Local
Management Guide
.
To gain a full understanding of this device and its capabilities, and to help
eliminate any potential problems during or after installation, please be
sure to read and understand all of the instructions/information in this
document and in the release notes supplied with your NBR.
1.1 USINGTHIS MANUAL
You should have a general working knowledge of Ethernet or IEEE 802.3
type data networks and their physical layer components, prior to installing
the NBR. The following summarizes the organization of this manual.
Chapter 1,
Introduction , provides instructions for using this manual,
product features, document conventions, related documents, and how to
get help.
Chapter 2,
Controls and Indicators , discusses the controls and
indicators for the NBR.
Chapter 3, Installation , provides instructions required to unpack the
NBR, perform pre-installation testing, install the NBR, and connect the
NBR to the network.
Chapter 4,
Troubleshooting , provides detailed troubleshooting
procedures for the NBR and a checklist to enable the user to troubleshoot
problems using LANVIEW LEDs.

NBR Features
NBR-SERIES Installation Guide Page 1-3
Appendix A, NBR Specifications , provides the physical properties,
environmental operating requirements, agency approvals, and power
requirements.
Appendix B,
EPIM Specifications , details the specifications for the
EPIMs that may be used with the NBR.
Appendix C, Network Planning and Configuration , provides
information on network cable requirements.
Appendix D, Additional Information , provides an NBR overview and
bridging functionality.
1.2 NBR FEATURES
LANVIEW LEDs
Cabletron Systems provides a visual diagnostic and monitoring system,
called LANVIEW, with the NBR. LANVIEW LEDs help you quickly
identify device, port, and physical layer problems.
LCD
The NBR-420 and NBR-620 are equipped with an LCD that provides
information about the NBR such as power up diagnostics, revision levels,
MAC and IP addresses, and error alerts.
RESET Button
The RESET button lets you re-boot and initialize the processor.
Intelligence
The NBR is equipped with an advanced Intel i960 microprocessor to
provide a scalable RISC-based architecture.
Hardware Bridging Logic
The NBR uses hardware packet filter/forward logic to increase bridging
performance.
Connectivity
The NBR-220 and the NBR-420 have two Ethernet ports (A and B
channels) and the NBR-620 has four Ethernet ports (A, B, C, and D
channels). These ports provide external connections through Ethernet Port
Interface Modules (EPIMs) located on the NBR faceplate.

Chapter 1: Introduction
Page 1-4 NBR-SERIES Installation Guide
Bridging/Routing
The NBR-420 and NBR-620 can support two optional Bridge/Router
Interface Modules (BRIMs). These modules allow for additional Ethernet
connections, Wide Area (Full or Fractional T1; 56k DDS) access, or links
to existing high-speed network backbones such asAsynchronous Transfer
Mode (ATM) or Fiber Distributed Data Interface (FDDI).
Memory
The NBR comes with 4 Megabytes (MB) of Shared Dynamic Random
Access Memory (SDRAM), 8 MB of Local Dynamic Random Access
Memory (LDRAM), and 2 MB of FLASH Electrically Erasable
Programmable Read Only Memory (FLASH EEPROM). In addition, the
NBR motherboard provides the option of upgrading memory capacity by
using Single In-line Memory Modules (SIMMs).
In order to fully use Remote Monitoring (RMON), it is necessary to
upgrade local memory with an 8 MB SIMM. Without this upgrade, some
RMON groups may not be available.
DLM
The NBR allows the option of using Cabletron Systems Distributed LAN
Monitor (DLM) software to locally poll and monitor any Simple Network
Management Protocol (SNMP) or Internet Protocol (IP) device.
Management Information Base (MIB) Support
The NBR provides IETF MIB support, which includes the following:
• Cabletron Systems Enterprise MIBs
• Remote Monitoring MIB (RMON)
• Bridge MIB
• MIBII
NOTE
For information on how to order SIMM upgrade packages,
contact Cabletron Systems Technical Support.

NBR Features
NBR-SERIES Installation Guide Page 1-5
MIB Navigation
NBR firmware supports a management tool which allows for MIB
navigation from a remote station. Refer to the
NBR-220, NBR-420, and
NBR-620 Local Management Guide
for more information regarding MIB
navigation.
SpanningTree Protocol Support
The NBR supports the following spanning tree protocols:
• 802.1d
• DECnet
Serial Connections/Local Management
The NBR-220 provides one RJ45 port (COM) for serial connections and
the NBR-420 and NBR-620 provide two RJ45 ports (COM 1 and
COM 2). These ports allow you to access Local Management by locally
connecting a DEC VT220 or VT320 terminal, or a PC using VT
emulation software. Refer to
your NBR-220, NBR-420, and NBR-620
Local Management Guide
for additional information on how to use Local
Management. In addition, any of the COM ports can be used as an
Uninterruptible Power Supply (UPS) management port.

Chapter 1: Introduction
Page 1-6 NBR-SERIES Installation Guide
1.3 CONVENTIONS USED INTHIS DOCUMENT
The following conventions are used throughout this document:
1.4 RELATED MANUALS
Use the following manuals to supplement the procedures and other
technical data provided in this manual.This manual references procedures
in these manuals, where appropriate, but does not repeat them.
Cabletron Systems
NBR-220, NBR-420, and NBR-620 Local
Management Guide
Cabletron Systems BRIM User’s Guide(s)
Cabletron Systems Routing Services Configuration Guide
NOTE
Note symbol. Calls the reader’s attention to any item of
information that may be of special importance.
TIP
Tip symbol. Conveys helpful hints concerning procedures or
actions.
!
CAUTION
Caution symbol. Contains information essential to avoid
damage to the equipment.
Warning symbol.Warns against an action that could result in
equipment damage, personal injury or death.

Getting Help
NBR-SERIES Installation Guide Page 1-7
1.5 GETTING HELP
If you need additional support related to this device, or if you have any
questions, comments, or suggestions concerning this manual, contact
Cabletron Systems Technical Support:
By phone [phone]
Monday – Friday; 8 A.M. – 8 P.M. Eastern Time
By CompuServe GO CTRON from any ! prompt
By Internet mail [email protected]
By FTP ctron.com (134.141.197.25)
Login anonymous
Password your email address
Before calling Cabletron Systems Technical Support, have the following
information ready:
• Description of the failure
• Description of any action(s) already taken to resolve the problem (e.g.,
changing mode switches, rebooting the unit, etc.)
• Description of your network environment (layout, cable type, etc.)
• Network load and frame size at the time of trouble (if known)
• Serial and revision numbers of all Cabletron Systems products in the
NBR network
• Device history (i.e., have you returned the device before, is this a
recurring problem, etc.)
• Any previous Return Material Authorization (RMA) numbers

NBR-SERIES Installation Guide Page 2-1
CHAPTER 2
CONTROLS AND INDICATORS
This chapter provides descriptions of the controls and indicators of the
Network Bridge Routers (NBR-220, NBR-420, NBR-620). The models
are as follows:
•NBR-220 –two Ethernet Port Interface Module (EPIM) ports
•NBR-420 – two EPIM ports, and two Bridge/Router Interface Module
(BRIM) ports
•NBR-620 –four EPIM ports, and two BRIM ports
Figure 2-1 The NBR-SERIES of Network Products
NBR-220 TWO PORT BRIDGE WITH LANVIEW
®
RECEIVE
TRANSMIT
COLLISION
STAND BY
PORT
B A
PWR
CPU
COM
RESET
PORT B PORT A
EPIM-A PWR EPIM-A PWR
NBR-420 MULTI PORT BRIDGE ROUTER WITH LANVIEW
®
RECEIVE
TRANSMIT
COLLISION
STAND BY
PORT
B A
PWR
CPU
COM 2 COM 1
DISPLAY RESET
PORT B PORT A
PORT F PORT E
EPIM-A PWR EPIM-A PWR
NBR-620 MULTI PORT BRIDGE ROUTER WITH LANVIEW
®
RECEIVE
TRANSMIT
COLLISION
STAND BY
PORT
D C B A
PWR
CPU
COM 2 COM 1
DISPLAY RESET
PORT D PORT C PORT B PORT A
PORT F PORT E
EPIM-A PWR EPIM-A PWR EPIM-A PWR EPIM-A PWR
BRIM-A100
STY
LNK
XMT
RCV
LNK YEL STB DSR LNK
T1/FT1
TST RED SYN CTS TST
SYNC
BRIM-WT1
BRIM-A100
STY
LNK
XMT
RCV
1092_01
LNK YEL STB DSR LNK
T1/FT1
TST RED SYN CTS TST
SYNC
BRIM-WT1

Chapter 2: Controls and Indicators
Page 2-2 NBR-SERIES Installation Guide
2.1 LANVIEW LEDs
The NBR-220, NBR-420, and NBR-620 incorporate the Cabletron
Systems LANVIEW status monitoring and diagnostics system.
LANVIEW LEDs help diagnose problems, such as a power failure or a
cable fault. Each NBR includes the following LANVIEW LEDs:
• A CPU LED, for board status
• RECEIVE, TRANSMIT, COLLISION, and STAND BY LEDs for
each Ethernet port
• A PWR LED for power status
2.2 RESET BUTTON
The front panel also has a RESET button that allows you to re-initialize
the processor. Chapter 4, Troubleshooting, provides detailed
descriptions of each NBR LANVIEW LED.
2.3 LCD DISPLAY
The NBR-420 and NBR-620 are equipped with an LCD Display located
on the front panel. The LCD provides status information about the present
as well as past condition of the hub.You can view power up diagnostics,
firmware revisions, MAC addresses, IP addresses, and alarm messages.
The LCD displays the most current event, but can store up to 25 past
events in memory. To access stored messages, press the DISPLAY button
located on front panel of the NBR. Refer to Chapter 4, Troubleshooting,
for detailed information.

NBR-SERIES Installation Guide Page 3-1
CHAPTER 3
INSTALLATION
This chapter contains the following procedures:
• Unpacking the NBR
• Preparing the NBR for installation
• Installing the NBR
• Connecting the NBR to the power source
• Connecting the NBR to the network
3.1 UNPACKING THE NBR
Unpack the NBR as follows:
1. Remove the packing material covering the NBR.
2. Carefully remove the NBR from the shipping box.
3. Visually inspect the NBR. If there are any signs of damage, contact
Cabletron Systems Technical Support immediately.
Only qualified personnel should perform installation
procedures.

Chapter 3: Installation
Page 3-2 NBR-SERIES Installation Guide
3.2 PREPARING THE NBR FOR INSTALLATION
This section contains the following procedures:
• Removing chassis cover
• Setting mode switches
• Setting NVRAM reset switch
• Installing SIMM upgrades
• Installing FLASH SIMMs
• Installing LDRAM and SDRAM SIMMs
• Adding/replacing EPIMs
• Adding/replacing BRIMs
• Testing the NBR
3.2.1 Removing Chassis Cover
This section describes how to remove the chassis cover from the NBR.
Remove the chassis cover to install BRIMs, set the mode switch bank,
and install SIMM memory upgrades.
Do not remove the cover from the NBR while power is applied
to the unit.
Do not power up the unit, for any reason, until the cover and
screws are in place.Hazardous voltages are present that could
cause damage to the unit or personal injury.
The components and boards associated with the NBR are
sensitive to static discharges.Be sure to use an antistatic wrist
strap and observe all static precautions during this procedure.
Failure to do so could result in damage to the NBR.
!
CAUTION

Preparing the NBR for Installation
NBR-SERIES Installation Guide Page 3-3
To remove the chassis cover, perform the following steps (see
Figure 3-1):
1. Disconnect the NBR from the network as follows:
a. Disconnect the power cord from the rear of the NBR.
b. Disconnect all network cables attached to the NBR. Note the ports
to which these cables attach.
2. Usea Phillips-head screwdrivertoremove the sevenscrewsthat attach
the chassis cover to the NBR. Place the screws aside.
Remove the chassis cover from the NBR.
Figure 3-1 Removing the Chassis Cover
Figure 3-2 shows the top view of the NBR with the cover removed. It also
shows the location of the mode switch bank, LDRAM slot, SDRAM slot,
FLASH slot, NVRAM reset switch, and BRIM Ports.
Chassis Cover
Chassis
Cover Screw
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