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Cabletron Systems NBR-220 Installation Manual

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

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  • Page 1 NBR-220, NBR-420, AND NBR-620 INSTALLATION GUIDE NBR-220 ® TWO PORT BRIDGE LANVIEW WITH RESET NBR-420 MULTI PORT BRIDGE ROUTER LANVIEW WITH DISPLAY RESET COM 2 COM 1 NBR-620 MULTI PORT BRIDGE ROUTER LANVIEW WITH DISPLAY RESET COM 2 COM 1...

  • Page 2: Fcc Notice

    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.
  • Page 3 Notice 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...
  • Page 4 CABLETRON SOFTWARE PROGRAM LICENSE 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.

  • Page 5: Declaration Of Conformity

    Notice DECLARATION OF CONFORMITY Application of Council Directive(s): Manufacturer’s Name: Manufacturer’s Address: European Representative Name: European Representative Address: Conformance to Directive(s)/Product Standards: Equipment Type/Environment: We the undersigned, hereby declare that the equipment packaged with this notice conforms to the above directives. Manufacturer Mr.

  • Page 6: Table Of Contents

    CHAPTER 1 INTRODUCTION Using This Manual... 1-2 NBR Features... 1-3 Conventions Used in This Document ... 1-6 Related Manuals... 1-6 Getting Help... 1-7 CHAPTER 2 CONTROLS AND INDICATORS LANVIEW LEDs... 2-2 RESET Button ... 2-2 LCD Display... 2-2 CHAPTER 3 INSTALLATION Unpacking the NBR ...
  • Page 7 Contents CHAPTER 4 TROUBLESHOOTING Using LANVIEW...4-1 Troubleshooting Checklist...4-4 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 Using the RESET Button ...4-12 APPENDIX A NBR SPECIFICATIONS Operating Specifications ...
  • Page 8 APPENDIX D ADDITIONAL INFORMATION NBR Overview ...D-1 Ethernet Channels A, B, C, and D...D-2 Channels E and F...D-2 Bridging Functionality ...D-3 INDEX NBR-SERIES Installation Guide Contents...

  • Page 9: Chapter 1 Introduction

    MULTI PORT BRIDGE ROUTER WITH DISPLAY RESET COM 2 COM 1 Figure 1-1 The NBR-SERIES of Network Products This manual uses the term NBR to describe the NBR-220, NOTE NBR-420, and NBR-620 unless otherwise specified. NBR-SERIES Installation Guide CHAPTER 1 INTRODUCTION...

  • Page 10: Using This Manual

    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...

  • Page 11: Nbr Features

    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.
  • Page 12 Chapter 1: Introduction 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 as Asynchronous Transfer Mode (ATM) or Fiber Distributed Data Interface (FDDI).
  • Page 13 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. Spanning Tree Protocol Support The NBR supports the following spanning tree protocols: •...

  • Page 14: Conventions Used In This Document

    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...

  • Page 15: Getting Help

    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 By CompuServe By Internet mail By FTP Login Password Before calling Cabletron Systems Technical Support, have the following information ready: •...

  • Page 16: 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 •...

  • Page 17: Lanview Leds

    Chapter 2: Controls and Indicators 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: •...

  • Page 18: 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 Only qualified personnel should perform installation procedures.

  • Page 19: Preparing The Nbr For Installation

    Chapter 3: Installation 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 •...
  • Page 20 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.
  • Page 21 Chapter 3: Installation LDRAM FLASH SDRAM MODE SWITCH BANK Cabletron Use Only Cabletron Use Only Cabletron Use Only Cabletron Use Only Baud Rate Default Switch (Off=9600, On=2400) Forced Download Switch (This switch forces image file downloads.) Cabletron Use Only Password Default Switch (This switch clears passwords stored in NVRAM.) Figure 3-2 Switch, BRIM, and SIMM Locations Page 3-4...

  • Page 22: Setting Mode Switches

    3.2.2 Setting Mode Switches Never adjust switch settings while the NBR has power applied to it. Not only is this dangerous, but the change in position activates the switch function and after you reinstall or power cycle the NBR it will initiate the request. Figure 3-2 shows the location and factory default settings of the mode switches.

  • Page 23: Setting Nvram Reset Switch

    Chapter 3: Installation After changing the state of this switch, and repowering the device, the NBR requests a new image until it either receives a new image, or you reset the NBR again by using the RESET button on the front panel. After resetting the NBR, the device attempts to locate a BOOTP server again.

  • Page 24: Installing Simm Upgrades

    3.2.4 Installing SIMM Upgrades The NBR allows memory upgrades for FLASH Electrically Erasable Programmable Read only Memory (FLASH EEPROM), Shared Dynamic Random Access Memory (SDRAM), and Local Dynamic Random Access Memory (LDRAM). This section explains how to locate and add or replace a Single In-line Memory Module (SIMM) for any of these memory types.
  • Page 25 Chapter 3: Installation SIMM Slot Connector Teeth SIMM Figure 3-3 Installing a FLASH SIMM Install a FLASH SIMM as follows: 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.

  • Page 26: Installing Ldram And Sdram Simms

    3.2.4.2 Installing LDRAM and SDRAM SIMMs To install an LDRAM or SDRAM SIMM, see Figure 3-4 and the steps below. SIMM Hole SIMM Slot Figure 3-4 Installing an LDRAM or SDRAM SIMM Install an LDRAM or SDRAM SIMM as follows: The components and boards associated with the NBR are sensitive to static discharges.

  • Page 27: Adding/Replacing Brims

    Chapter 3: Installation 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. CAUTION Failure to do so could result in damage to the NBR. Install an EPIM as follows: When removing an EPIM, make sure to pull the module straight out.

  • Page 28: Testing The Nbr

    3.2.7 Testing the NBR Before installing the NBR in a live network, test the hub in a controlled situation to ensure that it is bridging packets. Perform this test with two workstations (see Figure 3-6), as follows: 1. Connect the first workstation to an NBR EPIM or BRIM. 2.

  • Page 29: Installing The Nbr

    Chapter 3: Installation NBR-620 MULTI PORT BRIDGE ROUTER Figure 3-6 Installation Check-out 3.3 INSTALLING THE NBR You can install the NBR on any horizontal surface. In addition, Cabletron Systems provides an accessory kit with the NBR that includes hardware to install the NBR in a 19-inch rack. Select one of the following subsections and perform the steps that are applicable for your installation.

  • Page 30: Attaching The Strain-Relief Bracket

    • If a shelving unit is to be used, it must be able to support 30 pounds (13.6 kg) of static weight. • The temperature for the selected location must be maintained between 5 and 40 C, and less than 10 C per hour temperature change. 3.3.1 Attaching the Strain-Relief Bracket Attach the strain-relief bracket to the front of the NBR as follows: 1.

  • Page 31: Rack Mounting The Nbr

    Chapter 3: Installation 3.3.2 Rack Mounting the NBR Install the NBR in a 19-inch rack as follows: 1. Remove four cover screws (two from each side) located along the front edges of each side of the NBR. See Figure 3-8. 2.

  • Page 32: Free-Standing Installation

    It may take several minutes for the NBR to boot up. While NOTE booting, the NBR displays boot-up diagnostics through Local Management. Refer to the NBR-220, NBR-420, and NBR-620 Local Management Guide for additional information on how to connect and configure a Local Management console.
  • Page 33 Chapter 3: Installation 2. Observe the status of the LANVIEW LEDs on the NBR. When the CPU LED is flashing, the STAND BY LEDs indicate the boot state of the NBR. During this period (up to 5 minutes), the LEDs cycle through a series of internal diagnostics.

  • Page 34: Connecting The Nbr To The Network

    3.5 CONNECTING THE NBR TO THE NETWORK This section gives procedures for connecting the NBR to the network using the various EPIMs available. Once you have successfully powered up your NBR, you can add network connections. The procedure for connecting Ethernet segments to a hub varies depending on the media and ports you connect.
  • Page 35 Chapter 3: Installation Connect an EPIM-T to a Twisted Pair Segment as follows: 1. Connect the twisted pair segment to the module by inserting the RJ45 connector on the twisted pair segment into the RJ45 port on the module. See Figure 3-12. 2.

  • Page 36: Connecting An Aui Cable To An Epim-X

    3.5.2 Connecting an AUI Cable to an EPIM-X The signal quality error (SQE) switch remains in the OFF position for most network connections. However, some Data Terminal Equipment (DTE) requires SQE. Refer to your DTE CAUTION manual for SQE requirement information. Connect an EPIM-X to a device not requiring SQE as follows: 1.

  • Page 37: Connecting A Fiber Optic Cable To An Epim-F1/F2

    Chapter 3: Installation 3.5.3 Connecting a Fiber Optic Cable to an EPIM-F1/F2 or EPIM-F3 When connecting a fiber optic link segment to an EPIM-F1/F2 or EPIM-F3 keep the following in mind: A full alignment sleeve damages the receive port. SMA 905 connectors do not need alignment sleeves.
  • Page 38 Do not touch the ends of the fiber optic strands, and do not let the ends come in contact with dust, dirt, or other contaminants. Contamination of cable ends causes problems in data CAUTION transmissions. If necessary, clean contaminated cable ends using alcohol and a soft, clean, lint-free cloth.

  • Page 39: Connecting A Thin-Net Segment To An Epim-C

    Chapter 3: Installation 3. Attach the fiber labeled 2 to the applicable transmit port labeled TX, on the module. 4. At the other end of the fiber optic cable, attach the fiber labeled 1 to the transmit port of the device. 5.

  • Page 40: Connecting An Aui Cable To An Epim-A

    b. Attach the thin-net segment to one (1) of the female connectors on the tee-connector. Failure to terminate each tee-connector segment may result in improper segment operation. CAUTION c. Attach another thin-coax segment or a terminator to the other female connector on the tee-connector. When internal termination switch is set to off ( ): Connect BNC tee-connector to port.
  • Page 41 Chapter 3: Installation Connect an EPIM-A to an external network segment as follows: 1. Check that the PWR LED on the EPIM-A is on. If the PWR LED is off, contact Cabletron Systems Technical Support. 2. Attach an external transceiver to the network segment intended for AUI port connection.

  • Page 42: Using Lanview

    TROUBLESHOOTING This chapter provides information for troubleshooting network and NBR operational problems. The following sections describe the LANVIEW LEDs, provide a troubleshooting checklist, and explain how to use the LCD and the RESET button. 4.1 USING LANVIEW The NBR uses the Cabletron Systems built-in visual diagnostic and status monitoring system called LANVIEW.
  • Page 43 Chapter 4: Troubleshooting Color Green Multi- Color Green Yellow RECEIVE Yellow A, B, C, D TRANSMIT Green A, B, C, D Page 4-2 Table 4-1 LANVIEW LEDs Error Condition/ Description Recommended Action Indicates that the If OFF, check the input power NBR is receiving source (circuit breaker, fuse, power.
  • Page 44 Table 4-1 LANVIEW LEDs (Continued) Color COLLISION A, B, C, D STAND BY Yellow A, B, C, D NBR-SERIES Installation Guide Error Condition/ Description Recommended Action Collision detected Excessive flashing, or a solid light, indicates an inordinate on a segment. When the LAN is number of collisions.

  • Page 45: Troubleshooting Checklist

    Chapter 4: Troubleshooting 4.2 TROUBLESHOOTING CHECKLIST If your NBR is not operating properly, the following checklist describes some of the problems that may occur, possible causes for the problem, and suggestions for resolving the problem. Table 4-2 Troubleshooting Checklist Problem No LEDs on.
  • Page 46 Table 4-2 Troubleshooting Checklist (Continued) Problem User parameters (IP address, Device and Module name, etc.) are lost when device is powered down. No power to an external transceiver connected to an EPIM-A. High number of collisions on EPIM port. Port(s) go into standby for no apparent reason.

  • Page 47: Using The Lcd

    Chapter 4: Troubleshooting 4.3 USING THE LCD The NBR-420 and NBR-620 are equipped with a front panel LCD as shown in Figure 4-2. The LCD provides network statistics and diagnostic information such as Power up diagnostics, Revision levels, MAC and IP Addresses, and Error Alerts.

  • Page 48: Unsaved Initialization Messages

    4.3.1 Unsaved Initialization Messages Unsaved Initialization messages are generated during power-up and appear as the event occurs. These messages track the boot up sequence. They are not saved and cannot be recalled. Cabletron Hardware Init Cabletron BOOTP Discovery Cabletron TFTP Req. State Cabletron TFTP Complete Cabletron...
  • Page 49 Chapter 4: Troubleshooting To Exit There are three ways to exit the Static System messages: • From the last Static System message Momentarily press the DISPLAY button while the last message “COM 2 Port Function xxxxx” is displayed. The display automatically returns to the product name.

  • Page 50: Alarm Messages

    4.3.3 Alarm Messages Alarm messages pertain to events that occur within the NBR. The messages that can be displayed are shown in this section. Whether you are displaying Static System messages, Alarm NOTE messages, or Saved System messages, the display returns to the product name display 20 seconds after the last operation of the DISPLAY button.

  • Page 51: Saved System Messages

    Chapter 4: Troubleshooting Displayed Messages Port xxxxxx Link Established Port xxxxxx Not Linked Network/Port x EPIM Inserted Network/Port x EPIM Removed Bridge Port x Stand By Bridge Port x On Line No Messages in Queue x 4.3.4 Saved System Messages Saved System messages are device related startup or boot strap messages, BOOTP/TFTP host, or startup error messages.
  • Page 52 • From the product name display Press and hold the DISPLAY button for 3 seconds while the product name is displayed. When the button is released, the display steps to the Alarm messages. Then press and hold the DISPLAY button for another 3 seconds.

  • Page 53: Failure Or Error Messages

    Chapter 4: Troubleshooting 4.3.5 Failure or Error Messages Failure or Error Messages appear when an unrecoverable condition occurs. These messages are not saved and cannot be recalled by using the DISLAY button. When one of these messages appear call Cabletron Systems Technical Support.

  • Page 54: Appendix Anbr Specifications

    NBR SPECIFICATIONS This appendix provides the operating specifications for the Cabletron Systems NBR. Cabletron Systems reserves the right to change these specifications at any time without notice. A.1 OPERATING SPECIFICATIONS FLASH Memory: Shared Memory: Internal Processor: Read Only Memory: Non-Volatile RAM: Ethernet Controller: CPU Memory: NBR-SERIES Installation Guide...

  • Page 55: Com Port Pinouts

    Data Set Ready (DSR) Receive Data (RCV) Signal Ground (GND) Data Terminal Ready (DTR) Request To Send (RTS) Clear To Send (CTS) COM PORT (NBR-220 Only) PINOUTS Type: Standard RJ45 port Pin 1 Transmit Data (XMT) Data Carrier Detect (DCD)

  • Page 56: Physical Properties

    A.3 PHYSICAL PROPERTIES Dimensions: Weight (unit): A.4 ENVIRONMENTAL REQUIREMENTS Operating Temperature: Non-operating Temperature: Operating Humidity: A.5 CERTIFICATION Safety: Emission: Immunity: A.6 POWER SUPPLY REQUIREMENTS The NBR has a universal power supply. This unit allows you to NOTE use an input power from 100 to 125 Vac or 200 to 250 Vac, 50/60 Hz.

  • Page 57: Appendix Bepim Specifications

    EPIM SPECIFICATIONS B.1 EPIM SPECIFICATIONS EPIMs enable the connection of the NBR to different media types. Cabletron Systems offers a variety of EPIMs. The following sections explain specifications for each EPIM. B.2 EPIM-T The EPIM-T is an RJ45 connector supporting UTP cabling. It has an internal Cabletron Systems TPT-T 10BASE-T Twisted Pair Transceiver.

  • Page 58: Epim-F1/F2

    Appendix B: EPIM Specifications B.3 EPIM-F1/F2 The EPIM-F1 and EPIM-F2 shown in Figure B-2 support Multimode Fiber Optic cabling. Each EPIM has an internal Cabletron Systems FOT-F Fiber Optic Transceiver. The EPIM-F1 is equipped with SMA Connectors and the EPIM-F2 is equipped with ST Connectors. Specifications for the EPIMs are listed below.

  • Page 59: Epim-F3

    EPIM-F3 B.4 EPIM-F3 The EPIM-F3 shown in Figure B-3 supports Single Mode Fiber Optic cabling. It has an internal Cabletron Systems FOT-F Fiber Optic Transceiver and is equipped with ST Connectors. Specifications for the EPIM-F3 are listed below. 1092_23 Figure B-3 EPIM-F3 Transmitter Power decreases as temperatures rise and increases as temperatures fall.
  • Page 60 Appendix B: EPIM Specifications Parameter Transmitter Peak Wave Length Spectral Width Rise Time Fall Time Duty Cycle Bit Error Rate The transmitter power levels given above are Peak Power Levels after optical overshoot. Use a Peak Power Meter to compare the values given above to those measured on any particular port.

  • Page 61: Epim-C

    B.5 EPIM-C The EPIM-C supports thin coaxial cabling and is equipped with an internal Cabletron Systems TMS-3 Transceiver. Use the TERM switch on the front of the EPIM-C to set the internal 50 Ohm terminator. This eliminates the need to connect the port to a T-connector and terminator. Figure B-1 shows the setting for the terminator switch.

  • Page 62: Epim-A And Epim-X

    Appendix B: EPIM Specifications B.6 EPIM-A AND EPIM-X The EPIM-A is a DB15 female connector used to attach segments to an external transceiver. The EPIM-X is equipped with dual internal transceivers. It has a DB15 male connector used to attach segments to an AUI cable.

  • Page 63: Network Cable Requirements

    NETWORK PLANNING AND CONFIGURATION This appendix contains general networking guidelines. Before attempting to install the NBR or any additional EPIMs or BRIMs, review the requirements and specifications outlined in this appendix. Your network installation must meet the conditions, guidelines, specifications, and requirements included in this appendix to CAUT ION ensure satisfactory performance of this equipment.
  • Page 64 Appendix C: Network Planning and Configuration Losses introduced by connections at punch-down blocks and NOTE other equipment reduce total segment length. For each connector or patch panel in the link, subtract 12 meters from the total length of your cable. •...

  • Page 65: Multimode Fiber Optic Network

    • Temperature - Multi-pair PVC 24 AWG telephone cables typically have an attenuation of approximately 8-10 dB/100 m at 20 C (68 F). The attenuation of PVC insulated cable varies significantly with temperature. At temperatures greater than 40 C (104 F), we strongly recommend using plenum-rated cable to ensure attenuation remains within specification.

  • Page 66: Single Mode Fiber Optic Network

    25.6 s in one direction (51.2 s round trip). If the total propagation delay between any two nodes on the network exceeds 25.6 s, you must use bridges. • Length - The maximum possible multimode fiber optic cable length is m (2187.2 yards).

  • Page 67: Thin-Net Network

    • Length - If you meet all system budgets, the maximum single mode fiber optic cable length can reach 5 km (3.1 miles) with bridges at each segment end. However, IEEE 802.3 FOIRL specifications specify a maximum of 1 km (1093.6 yards).

  • Page 68: Transceiver Requirements

    Appendix C: Network Planning and Configuration C.2 TRANSCEIVER REQUIREMENTS When you connect an external network segment to an EPIM-A in your hub through a transceiver, that transceiver must meet IEEE 802.3 standards or Ethernet version 1.0 or 2.0 requirements. The transceiver must also have SQE disabled.

  • Page 69: Nbr Overview

    ADDITIONAL INFORMATION D.1 NBR OVERVIEW The NBR provides bridging and management for up to four separate Ethernet channels (A, B, C, and D). The following list contains the currently available EPIMs: • EPIM-T – 10BASE-T Twisted Pair Segment Interface Module •...

  • Page 70: Ethernet Channels A, B, C, And D

    The NBR manages all Ethernet bridging traffic within its resident hub. This means that the NBR-620 controls up to four of the Ethernet bridging channels—A, B, C, and D and the NBR-220 and NBR-420 control up to two channels—A and B. These channels access the same NBR shared memory, so bridging between channels is concurrent.

  • Page 71: Bridging Functionality

    The NBR incorporates IEEE 802.1d or DEC Spanning Tree Algorithms (user selectable), allowing bridges in parallel between segments as backup paths for fault tolerance. These parallel bridges remain in a standby condition until the primary path fails. When the NBR receives frames (traffic) from any of the Ethernet...
  • Page 72 Certification A-3 COM port pinouts A-2 Environmental requirements A-3 Help 1-7 LANVIEW LEDs 1-3, 2-2 LCD 1-3, 2-2, 4-6 connecting to the network 3-17 features 1-3 installation 3-1 overview D-1 Network cable requirements C-1 connection 3-17 operating specifications A-1 transceiver requirements C-6 NVRAM reset switch 3-6 Power supply requirements A-3 Related material 1-6...
  • Page 73 The mains cord used with this equipment must be a 2 conductor plus ground type with minimum 0.75 mm square conductors and must incorporate a standard IEC appliance coupler on one end and a mains plug on the other end which is suitable for the use and application of the product and that is approved for use in the country of application.

This manual is also suitable for:

Nbr-620Nbr-420

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