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Chapter 3: Installation

Page 3-8

NBR-SERIES Installation Guide

Figure 3-3

Installing a FLASH SIMM

Install a FLASH SIMM as follows:

1. Insert the SIMM between the connector teeth in the SIMM slot.

2. Pivot the SIMM back until it locks into the clips in the SIMM slot, and

the SIMM holes fit over the SIMM slot posts.

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.

2

1

SIMM

Clips

Connector

Teeth

SIMM Slot

SIMM Hole

SIMM Slot

Post

1092_08

!

CAUTION

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Summary of Contents for NBR-220

Page 1: ...ORT 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 TS...

Page 2: ... 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 inter...

Page 3: ...reventing 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 agre...

Page 4: ...AGES 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 D...

Page 5: ...e 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 ___________________________________ ________________________________...

Page 6: ... 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 Connectin...

Page 7: ...rt 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...

Page 8: ...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 ...

Page 9: ...ribe 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...

Page 10: ... sure to read and understand all of the instructions information in this document and in the release notes supplied with your NBR 1 1 USING THIS 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 instru...

Page 11: ...W 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...

Page 12: ...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 so...

Page 13: ...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 addit...

Page 14: ... 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 inf...

Page 15: ...in 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 ...

Page 16: ...W 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 R...

Page 17: ...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 revision...

Page 18: ...ing 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 ...

Page 19: ...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 bo...

Page 20: ...ched to the NBR Note the ports to which these cables attach 2 Use a Phillips head screwdriver to remove the seven screws that 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 FL...

Page 21: ... PORT E NVRAM RESET SWITCH 1 2 3 4 5 6 7 8 MODE SWITCH BANK OFF ON Cabletron Use Only Cabletron Use Only Cabletron Use Only Cabletron Use Only Baud Rate Default Switch Off 9600 On 2400 Cabletron Use Only Password Default Switch This switch clears passwords stored in NVRAM Forced Download Switch This switch forces image file downloads FLASH 1092_07 ...

Page 22: ...n sets the baud rate to 2400 The default position is OFF Switch 6 Forced Download Changing the state of this switch i e moving the switch from one position to another forces the NBR to download an image file from the station acting as the TFTP server 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 functio...

Page 23: ...words 3 2 3 Setting NVRAM Reset Switch Figure 3 2 shows the location of the NVRAM reset switch The NBR uses NVRAM Non Volatile Random Access Memory to store user entered parameters such as IP address device name etc Changing the state of this switch i e moving the switch from one position to another resets these parameters to the factory defaults After changing the state of the NVRAM reset switch ...

Page 24: ... locate and add or replace a Single In line Memory Module SIMM for any of these memory types Each memory type has a specific SIMM slot location on the NBR motherboard See Figure 3 2 for SIMM slot location When installing SIMM boards make sure that you place them in their proper slots 3 2 4 1 Installing FLASH SIMMs Installing a FLASH SIMM is a two step process Refer to Figure 3 3 and perform the fo...

Page 25: ...ck until it locks into the clips in the SIMM slot and the SIMM holes fit over the SIMM slot posts 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 2 1 SIMM Clips Connector Teeth SIMM Slot SIMM Hole SIMM Slot Post 10...

Page 26: ...s 3 2 5 Adding Replacing EPIMs This section contains procedures on how to add replace an Ethernet Port Interface Module EPIM to upgrade or change the capabilities of your hub See Figure 3 5 After installing your new EPIM refer to appropriate EPIM sections in this chapter for connecting media types and to verify proper operation The components and boards associated with the NBR are sensitive to sta...

Page 27: ...ding Replacing BRIMs To add or replace Bridge Router Interface Modules BRIMs in the NBR 420 and NBR 620 refer to the applicable BRIM User s Guide 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 When removin...

Page 28: ...r BRIM 2 Connect the second workstation to an NBR EPIM or BRIM 3 Assign a valid IP address to the NBR using Local Management 4 Designate the first workstation as a file server and the second one as the client Refer to the workstation manuals for establishing one as a file server and one as a client 5 Send packets between the two workstations to verify the proper operation of the NBR If a failure o...

Page 29: ...If you decide not to install the NBR in a 19 inch rack the following requirements must be met when selecting a location An unrestricted free surface area at least 21 inches wide 18 inches deep and 6 inches high is needed A single phase grounded power receptacle must be located within 7 feet of the site NOTE Ensure that you select a location within reach of the network cabling BRIM A100 STY LNK XMT...

Page 30: ...lief bracket to the front of the NBR as follows 1 Remove the strain relief bracket and four 8 32 x 3 8 inch screws from the NBR installation kit 2 Attach the strain relief bracket to the bottom of the NBR as shown in Figure 3 7 Figure 3 7 Attaching the Strain Relief Bracket Use only the appropriate screws to attach the strain relief Use of longer screws may cause damage to the unit or electrical s...

Page 31: ... brackets to each end of the NBR Figure 3 8 Rackmount Brackets Installation 3 With the mounting brackets attached position the NBR between the vertical frame members of the 19 inch rack and fasten it securely with the mounting screws See Figure 3 9 Figure 3 9 Installing the NBR in the Rack Screws 4 Rack Mounting Brackets 2 NBR 620 MULTI PORT BRIDGE ROUTER WITH LANVIEW PORT D PORT C PORT B PORT A P...

Page 32: ...BR to the power source as follows 1 Plug the power cord into a grounded wall outlet NOTE The NBR has a universal power supply This allows you to connect the NBR to power sources from 100 Vac to 125 Vac or 200 Vac to 250 Vac 50 60 Hz NOTE It may take several minutes for the NBR to boot up While booting the NBR displays boot up diagnostics through Local Management Refer to the NBR 220 NBR 420 and NB...

Page 33: ...LEDs should be in the following conditions PWR LED on indicating that the NBR is receiving power CPU LED flashing green indicating proper NBR operation STAND BY A B C D LEDs ON or OFF depending on the port s position in the Spanning Tree Algorithm Appropriate EPIM BRIM LEDs ON Refer to Section 3 5 Connecting the NBR to the Network for appropriate LED status for individual EPIMs Refer to individual...

Page 34: ...erform the procedure described in the subsection s that apply to your hub 3 5 1 Connecting a Twisted Pair Segment to an EPIM T Before connecting a segment to the EPIM T check each end of the segment to determine wire crossover If the wires do not cross over use the switch on the EPIM T to internally cross over the RJ45 port Refer to Figure 3 12 to properly set the EPIM T crossover switch Figure 3 ...

Page 35: ...t the other end of the twisted pair segment is powered b Verify that the RJ45 connectors on the twisted pair segment have the proper pinouts Figure 3 13 shows the RJ45 pinouts Figure 3 13 Cable Pinouts EPIM T RJ45 Port c Check the cable for continuity d Check that the twisted pair connection meets dB loss and cable specifications outlined in Section C 1 1 10BASE T Twisted Pair Network If you still...

Page 36: ... in length to the port located on the EPIM X Figure 3 14 and the other end to the intended node Figure 3 14 The 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 manual for SQE requirement information NOTE If the SQE light remains on even though the SQE switch is in the OFF pos...

Page 37: ...f fiber optic cabling the Transmit TX and the Receive RX The Transmit strand from a module port connects to the Receive port of a fiber optic Ethernet device at the other end of the segment i e TX of the applicable port on the module goes to RX of the other fiber optic device The Receive strand of the applicable port on the module connects to the Transmit port of the fiber optic Ethernet device i ...

Page 38: ...fiber labeled 1 to the applicable receive port labeled RX on the module Figure 3 15 Figure 3 15 The EPIM F1 F2 and EPIM F3 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 transmissions If necessary clean contaminated cable ends using alcohol and a soft clean lint free c...

Page 39: ...y that the fiber connection meets the dB loss specifications outlined in Section C 1 2 Multimode Fiber Optic Network If you still cannot establish link contact Cabletron Systems Technical Support 3 5 4 Connecting a Thin Net Segment to an EPIM C Connect a thin net segment to an EPIM C as follows 1 Set the Internal Termination Switch see Figure 3 16 located to the right of the port and labeled TERM ...

Page 40: ...ransceiver to which you connect the EPIM A does not have the signal quality error SQE or heartbeat test function enabled The EPIM does not operate if the transceiver has the SQE test function enabled Refer to the applicable transceiver manual for additional information CAUTION Attach thin net segment directly to BNC connector when internal termination switch is set to on When internal termination ...

Page 41: ...than 50 meters in length to the transceiver you connected to the network in Step 2 4 Connect the AUI cable to the AUI port located on the EPIM A See Figure 3 17 Figure 3 17 The EPIM A 5 Lock the AUI connector into place using the connector slide latch 6 If the transceiver PWR LED is off with the AUI cable connected perform the following steps a Check the AUI connections for proper pinouts Appendix...

Page 42: ...d 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 With LANVIEW you can quickly scan the LEDs to observe network status or diagnose network problems Figure 4 1 LANVIEW LEDs NBR 620 MULTI PORT BRIDGE ROUTER WITH LANVIEW RECEIVE TRANSMIT COLLISION STAND BY PORT D C B A PWR CPU C...

Page 43: ...the board does not re initialize it has probably failed Call Cabletron Systems Technical Support RECEIVE A B C D Yellow Light flashes to indicate that a segment is receiving a frame If none of the receive LEDs are flashing the NBR is not receiving frames on any of the segments Ensure that all connected ports are enabled TRANSMIT A B C D Green Light flashes to indicate that a segment is transmittin...

Page 44: ...for any transceiver connected to the external channels A B C or D of the NBR Check cabling for data loops or defective cables STAND BY A B C D Yellow Indicates packets cannot be forwarded as the Spanning Tree Algorithm has put the corresponding Bridge Port into a standby mode Network Management has placed the NBR in a Standby mode a data loop condition exists Check with your Network Administrator ...

Page 45: ... that the NBR has adequate power Verify proper installation and check to see that the PWR LED is green No Local Management Password screen Terminal setup is not correct Improper console cable UPS cable pinouts Refer to your NBR Local Management Guide for proper setup procedures Refer to your NBR Local Management Guide for proper console UPS port pinouts Cannot contact the NBR from in band manageme...

Page 46: ...xternal transceiver connected to an EPIM A AUI cable may be defective Transceiver may be defective EPIM is defective Replace AUI cable Replace transceiver Replace EPIM High number of collisions on EPIM port External transceiver has SQE enabled Disable SQE Port s go into standby for no apparent reason Configurations where devices connect across NBR channels can cause the NBR to detect a looped cond...

Page 47: ...IP Addresses and Error Alerts Figure 4 2 The LCD Five types of messages appear on the LCD Unsaved Initialization messages Static System messages Alarm messages Saved System messages Failure or Error messages Sections 4 3 1 through 4 3 5 describe each type of LCD message and provide instructions for displaying them NBR 620 MULTI PORT BRIDGE ROUTER WITH LANVIEW RECEIVE TRANSMIT COLLISION STAND BY PO...

Page 48: ...ame displayed momentarily press the DISPLAY button to step to the first message Each time you press the DISPLAY button the next message is displayed until the last message Then the display automatically exits to the product name Cabletron Hardware Init Cabletron Boot From Flash Cabletron BOOTP Discovery Cabletron RARP Req State Cabletron TFTP Req State Cabletron TFTP in Progress Cabletron TFTP Com...

Page 49: ...tion 4 3 3 Displayed Messages Comments Host IP Address xxx xxx xxx xxx Displays the IP address of the NBR Can change IP address in Local Management MAC Address 00001dxxxxx Displays the MAC address of channels A B C D E or F RAM Image Rev xx xx xx Displays the revision number of the FLASH EEPROM Boot PROM Rev xx xx xx Displays the revision number of the internal Boot PROM Flash Programmed xx Times ...

Page 50: ... and hold the DISPLAY button for 3 seconds while a Static System message is displayed When the button is released the display steps to the Alarm messages described Thereafter each time you press the DISPLAY button the next message is displayed To Exit There are two ways to exit the Alarm messages Automatic 20 second exit Allow 20 seconds to elapse after the last DISPLAY button operation The displa...

Page 51: ...nk status of ports A B C D E or F Network Port x EPIM Inserted Displays installation status of ports A B C or D Network Port x EPIM Removed Displays installation status of ports A B C or D Bridge Port x Stand By Indicates Bridge port A B C or D in Stand By mode Bridge Port x On Line Indicates Bridge port A B C or D On Line No Messages in Queue x No Alarm messages TFTP Host xxx xxx xxx xxx TFTP Fil...

Page 52: ...ystem message is displayed From an Alarm message display Press and hold the DISPLAY button for 3 seconds while an Alarm message is displayed When released the display steps to one of the Saved System messages Thereafter each time you press the DISPLAY button the next Saved System message is displayed To Exit There are two ways to exit the Saved System messages Automatic 20 second exit Allow 20 sec...

Page 53: ...port The Failure or Error messages are as follows 4 4 USING THE RESET BUTTON The NBR incorporates a recessed RESET button See Figure 4 2 This RESET button initializes the NBR processor To use the RESET button use a pen or pencil to press the button in When this is done the NBR initializes itself Cabletron Ctrl Reg Err Cabletron BBRAM Failure Cabletron SDRAM Failure Cabletron Modem SCC Error Cablet...

Page 54: ...Cabletron Systems reserves the right to change these specifications at any time without notice A 1 OPERATING SPECIFICATIONS FLASH Memory 2 MB Shared Memory 4 MB expandable to 12 MB Internal Processor Intel 80960 running at 24 MHz Read Only Memory 128 K Non Volatile RAM 128 K Ethernet Controller 4 DP83932 Controllers CPU Memory 8 MB expandable to 12 MB ...

Page 55: ...d RTS To COM 1 Port 8 Clear To Send CTS Type Standard RJ45 port Pin 1 Transmit Data XMT From COM 2 Port 2 Data Carrier Detect DCD From COM 2 Port 3 Data Set Ready DSR To COM 2 Port 4 Receive Data RCV To COM 2 Port 5 Signal Ground GND 6 Data Terminal Ready DTR From COM 2 Port 7 Request To Send RTS To COM 2 Port 8 Clear To Send CTS Type Standard RJ45 port Pin 1 Transmit Data XMT From COM Port 2 Data...

Page 56: ...IEC 950 Emission FCC Part 15 Class A VCCI Class 1 and EN 55022 Class A Immunity EN 50082 1 A 6 POWER SUPPLY REQUIREMENTS The power supply has two outputs of 5 volts and 12 volts The maximum output power is 125 watts and the minimum efficiency is 65 under all conditions of line at full load The minimum and maximum load current from each output is shown below NOTE The NBR has a universal power suppl...

Page 57: ... an internal Cabletron Systems TPT T 10BASE T Twisted Pair Transceiver The slide switch on the EPIM T determines the cross over status of the cable pairs If the switch is on the X side the pairs are internally crossed over If the switch is on the side the pairs are not internally crossed over Figure B 1 shows the pinouts for the EPIM T in both positions Figure B 1 Crossover Switch on the EPIM T Po...

Page 58: ...d 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 If Power Levels are being measured with an Average Power Meter add 3 dBm to the measurement to compare the measured values to the values listed i e 33 5 dBm average 3 dBm 30 5 dBm peak Parameter Typical Value Worst Case Worst Case Budget Typical Budget R...

Page 59: ...the EPIM F3 are listed below Figure B 3 EPIM F3 Transmitter Power decreases as temperatures rise and increases as temperatures fall Use the Output Power Coefficient to calculate increased or decreased power output for the operating environment For example the typical power output at 25 C is 16 4 dBm For a 4 C temperature increase multiply the typical coefficient 0 15 dBm by four and add the result...

Page 60: ...r port To measure power levels with an Average Power Meter add 3 dBm to the average power measurement to compare the average power values measured to the values listed above i e 33 5 dBm average 3 dBm 30 5 dBm peak Parameter Typical Minimum Maximum Transmitter Peak Wave Length 1300 nm 1270 nm 1330 nm Spectral Width 60 nm 100 nm Rise Time 3 0 ns 2 7 ns 5 0 ns Fall Time 2 5 ns 2 2 ns 5 0 ns Duty Cyc...

Page 61: ...tor and terminator Figure B 1 shows the setting for the terminator switch Figure B 4 EPIM C with BNC Port Connector Type BNC receptacle with gold center contact for use with BNC type T connectors and RG58 thin coaxial cable Grounding The BNC port of the Coaxial Interface Modules is not connected to earth ground Connecting a thin net segment to earth ground at more than one point could produce dang...

Page 62: ...ternal transceivers It has a DB15 male connector used to attach segments to an AUI cable Figure B 5 shows both modules Figure B 5 EPIM A and EPIM X AUI Port Table B 1 DB15 Pinouts Pin 1 Logic Ref 9 Collision 2 Collision 10 Transmit 3 Transmit 11 Logic Ref 4 Logic Ref 12 Receive 5 Receive 13 Power 12Vdc 6 Power Return 14 Logic Ref 7 No Connection 15 No Connection 8 Logic Ref Connector Shell Protect...

Page 63: ...rk configuration C 1 1 10BASE T Twisted Pair Network When connecting a 10BASE T Twisted Pair Segment to an EPIM T ensure the network meets the following requirements Length The IEEE 802 3 10BASE T standard requires that 10BASE T devices transmit over a 100 meter 328 foot link using 22 24 AWG unshielded twisted pair wire However cable quality largely determines maximum link length If you use high q...

Page 64: ... can cause jitter in the bit cell timing resulting in data errors 10BASE T links must not generate more than 5 0 ns of jitter Make sure your cable meets 10BASE T link impedance requirements to rule out jitter as a concern Delay The maximum propagation delay of a 10BASE T link segment must not exceed 1000 ns This 1000 ns maximum delay limits the maximum link segment length to no greater than 200 me...

Page 65: ...r optic cabling 100 140 µm fiber optic cabling Attenuation You must test the fiber optic cable with a fiber optic attenuation test set adjusted for an 850 nm wavelength This test verifies the signal loss if a cable falls within the following acceptable levels 13 0 dB or less for a 50 125 µm fiber cable segment 16 0 dB or less for a 62 5 125 µm fiber cable segment 19 0 dB or less for a 100 140 µm f...

Page 66: ...nts should consist of 8 125 to 12 125 µm single mode fiber optic cabling You can also use 62 5 125 µm multimode cable with the EPIM F3 however multimode cable allows for greater optical loss and limits the possible distance to 2 km Attenuation You must test the fiber optic cable with a fiber optic attenuation test set adjusted for a 1300 nm wavelength This test verifies that the signal loss in a c...

Page 67: ...al segment to an EPIM C ensure your network meets the following requirements Cable Type Use only 50 ohm RG58A U type coaxial cable for thin net cable segments Length The thin net segment must not exceed 185 meters Terminators Terminate each end of a thin net segment Connectors You can use up to 29 tee connectors throughout the length of the cable segment for host connections If you use an excessiv...

Page 68: ...Services Configuration Guide C 4 THE NBR 420 NBR 620 AND BRIMS The example in Figure C 1 illustrates just one possible NBR 620 BRIM configuration The NBR620 BRIM combination provides various connection possibilities depending on the BRIM s you use Refer to individual BRIM manuals and or Cabletron Systems Routing Services Configuration Guide to better understand the capabilities of each device Figu...

Page 69: ...3 Single Mode Fiber Optic Segment Interface Module EPIM C Thin net Coaxial Interface Module EPIM A EPIM X AUI Cable Segment Interface Modules In addition to Ethernet channels A through D the NBR provides management for two optional Bridge Router Interface Modules BRIMs These modules allow for additional Ethernet connections Wide Area Full or Fractional T1 56 k DDS access or links to existing high ...

Page 70: ...n 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 D 3 CHANNELS E AND F The NBR 420 and NBR 620 support two optional Bridge Router Interface Modules BRIMs These modules provide additi...

Page 71: ... fails When the NBR receives frames traffic from any of the Ethernet channels it places the frame in its buffer memory and then goes through an information gathering decision making process of what to do with those frames The device determines the following Where the frames came from source address and if it has seen frames from that address before learning Where the frames are going destination a...

Page 72: ...LEDs 1 3 2 2 LCD 1 3 2 2 4 6 N NBR 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 P Power supply requirements A 3 R Related material 1 6 RESET button 1 3 2 2 4 12 T Technical Support 1 7 ...

Page 73: ... Anwendung des Geraetes geeignet und der zum Benuetzen im Lande der Anwendung anerkannt ist SPANISH El cable principal de la red eléctrica utilizado con este equipo debe tener 2 conductores y 1 toma de tierra con un mínimo de 0 75 mm2 cada uno y necesita tener un aparato de acoplamiento standard IEC en un extremo y un enchufe para el cable principal de la red eléctrica en el otro extremo lo cual s...

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