Manuals / Cabletron Systems / Computer Equipment / Switch

Cabletron Systems MICROMMAC-22T Cable Recommendations/Troubleshooting, Fiber Optic Budget, Noise

Models: 42T MICROMMAC MICROMMAC-22T

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REQUIREMENTS/SPECIFICATIONS

Fiber Optic Budget

The ﬁber optic delay budget, which determines the ﬁber optic cable’s maximum length, should be calculated and taken into consideration in the network design stage. Fiber optic delay budget is determined by summing the optical signal loss due to ﬁber optic cable attenuation, in-line splices, and ﬁber optic connectors.

2.2 CABLE RECOMMENDATIONS/TROUBLESHOOTING

The following sections describe common cable problems and recommendations for correcting them.

Crosstalk

Crosstalk is interference caused by signal coupling between different cable pairs contained within a multi-pair cable bundle. Multi-pair cables should not be used for UTP lobe cabling. UTP lobe cabling should be dedicated to carrying Token Ring trafﬁc. Avoid mixing Token Ring signals with other applications (voice, etc.) within the same cable.

Noise

Noise can be caused by crosstalk or externally imposed impulses. If noise-induced errors are suspected, ensure that the electrical wiring in the area is properly wired and grounded and/or try re-routing cabling away from potential noise sources (motors, switching equipment, ﬂuorescent lighting, high amperage equipment).

Temperature

The attenuation of PVC-insulated cable varies signiﬁcantly with temperature. Check the cable manufacturer’s speciﬁcations. Plenum-rated cables are strongly recommended in areas where temperatures exceed 40˚C. Under such conditions, plenum-rated cables ensure that cable attenuation remains within speciﬁcations.

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Cabletron Systems MICROMMAC-22T Cable Recommendations/Troubleshooting, Fiber Optic Budget, Crosstalk, Noise, Temperature

Contents

USER’S GUIDE MICROMMAC-22T/24T/42T/44T STACKABLE TOKEN RING INTELLIGENT HUBSCopyright March 1996 by Cabletron Systems, Inc FCC NOTICE DOC NOTICEVCCI NOTICE EXCLUSION OF WARRANTY AND DISCLAIMER OF LIABILITY CABLETRON SYSTEMS, INC. PROGRAM LICENSE AGREEMENTCABLETRON SOFTWARE PROGRAM LICENSE UNITED STATES GOVERNMENT RESTRICTED RIGHTS CHAPTER 1 INTRODUCTION CONTENTSCHAPTER 2 REQUIREMENTS/SPECIFICATIONS CHAPTER 3 INSTALLATIONCHAPTER 4 LOCAL MANAGEMENT CHAPTER 5 TROUBLESHOOTINGCONTENTS 5.2.4 Saved System Messages 5.3 VIEWING POWER UP DIAGNOSTIC TESTSFigure 1-1. The MicroMMAC-T 1.1 CONTENTS OVERVIEWCHAPTER INTRODUCTION DISPLAY RESETINTRODUCTION 1.2 MicroMMAC-T OVERVIEW1.3 MicroMMAC-T FEATURES TelnetFigure 1-2. Typical MicroMMAC-T Conﬁguration Scenario Local Management Cable Signal PolaritySpeed Fault Protection Active TCU PortsLANVIEW LEDs Ring Speed SwitchCabletron’s Distributed LAN Monitor Mode Flash EEPROMMIB Support Reset ButtonCOM Port Applications LCD and LCD Display ButtonRMON MIB Support Table 1-2. RMON MIB RFC 1271/1513 Support Cont 1.4 STACKABLE CAPABILITIESFigure 1-3. Typical Stackable Conﬁguration 1.5 BRIDGING/ROUTING CAPABILITIES1.5.1 SNA/WAN Integration 1.6 REMOTE MANAGEMENT CAPABILITIES1.7 TELNET CAPABILITIES Commercial Building Wiring Standard, EIA/TIA-568 1.8 RECOMMENDED READING1.9 GETTING HELP Local Area Networks, Token Ring Access Method, IEEE Standard 802.52.1 CABLE SPECIFICATIONS CHAPTER REQUIREMENTS/SPECIFICATIONSAttenuation and Impedance 2.1.1 UTP Cable SpeciﬁcationsMaximum Lobe Lengths Type 3 Media FiltersMaximum Number of Stations Table 2-3. STP Cable Speciﬁcations 2.1.2 STP Cable SpeciﬁcationsAttenuation and Impedance Maximum Lobe LengthsTable 2-5. STP Maximum Drive Distance Maximum Trunk LengthsMaximum Number of Stations Table 2-4. STP Maximum Lobe Lengths802.5 speciﬁcations allow for a The maximum allowable ﬁberoptic cable length is 2 km 2187.2 yards. However, IEEEMaximum Trunk Lengths 2.1.4 Single Mode Fiber Optic Cable SpeciﬁcationsTable 2-7. Single Mode Fiber Optic Cable Speciﬁcations Fiber Optic BudgetCrosstalk 2.2 CABLE RECOMMENDATIONS/TROUBLESHOOTINGTemperature Fiber Optic Budget2.3 COM PORT SPECIFICATIONS SLIP 2.4 TPIM SPECIFICATIONSBooting/Diagnostics Local ManagementTPIM-T4 TPIM-T2TPIM-F2 NOTE Transmitter power and receive sensitivity levels, shown inParameter REQUIREMENTS/SPECIFICATIONSTPIM-F3 TPIM-F2 SpeciﬁcationsTable 2-9. TPIM-F3 Speciﬁcations When measuring power levels with an Average Power Meter, add 3 dBm2.5 GENERAL SPECIFICATIONS 2.5.1 Power Supply Requirements2.5.2 Environmental Requirements 2.5.5 2.5.3 SafetyService 2.5.4 PhysicalCHAPTER INSTALLATION 3.1 UNPACKING THE MicroMMAC-T3.2 ATTACHING THE STRAIN RELIEF BRACKET 3.3 INSTALLING THE MicroMMAC-T 3.3.1 Rack-Mounting the MicroMMAC-TINSTALLATION 3.3.2 Wall-Mounting the MicroMMAC-T Figure 3-2. Installing of Rack-Mount BracketsFigure 3-3. Installing the MicroMMAC-T in a 19-inch Rack Molly Screw Anchors Molly Screws Bracket Screws Wall Mounting Bracket Figure 3-4. Wall-Mounting the MicroMMAC-TFigure 3-5. Free-Standing Installation 3.3.3 Free-Standing Installation3.4 CONNECTING TO A POWER SOURCE 3.5 RESETTING THE MICROMMAC-T3.6 SETTING THE RING SPEED To reset the MicroMMAC-TTo change the ring speed To restore MicroMMAC-T parameters to the factory defaults 3.7 SETTING THE NVRAM SWITCHNOTE Clearing and resetting NVAM does not reset the date and time 3.8 CONNECTING LOBE PORT CABLINGat device port INSTALLATIONRJ45 Plug at TCULobe Cable INSTALLATIONFigure 3-10. UTP Conﬁguration Example 3-10Figure 3-12. MicroMMAC-T Network Ports INSTALLATIONTo attach a lobe segment to a MicroMMAC-T network port Figure 3-11. STP Conﬁguration Example3.9 INSTALLING TPIM MODULES Table 3-1. Pinout Cross-Reference for TPIMs Cont 3.9.1 Setting Phantom and RI/RO Switches3.9.2 TPIM Installation To install a TPIM, perform the following stepsCAUTION Observe all static precautions while handling TPIMs To connect a TPIM-T1 to a Twisted Pair Segment 3.9.3 Connecting STP SegmentsTo connect a segment to a TPIM-T2/-T4 3.9.4 Connecting Twisted Pair SegmentsFigure 3-16. The TPIM-T2/-T4 3.9.5 Connecting Fiber Optic Link SegmentsFigure 3-17. The TPIM-F2/-F3 To connect a ﬁber optic link segment to the TPIM-F2 /-F3To check MicroMMAC-T installation 3.10 CHECKING THE INSTALLATIONCHAPTER LOCAL MANAGEMENT 4.1 MANAGEMENT TERMINAL REQUIREMENTSUse Local Management to Do the Following 4.1.2 Management Terminal Setup Parameters 4.1.1 Attaching the Management TerminalTo attach a management terminal to the MicroMMAC-T Table 4-1. Terminal Settings for LM Terminal 4.1.3 Modem Cable Conﬁguration and SetupTo access Local Management 4.2 ACCESSING LOCAL MANAGEMENTFigure 4-3. MicroMMAC-T Local Management Screen 4.2.1 Accessing Local Management via TelnetMAIN MENU Screen 4.2.2 Accessing Local Management from a Modem4.3 USING LOCAL MANAGEMENT SETUP MENU ScreenSETUP MENU 4.3.1 Working with Local Management ScreensSetting or Modifying Local Management Screen Fields SETUP MENU STATUS MENU DEVICE STATISTICS MIB NAVIGATOR EXITExiting Your Local Management Session Exiting a Local Management ScreenSetting the System Date 4.3.2 The SYSTEM LEVEL ScreenSetting the Host IP Address Setting the System TimeTo modify the Subnet Mask Modifying the Subnet MaskNOTE ARBP is supported only by Cabletron products Setting the Default GatewayTo set the Default Gateway Setting Automatic Beacon Recovery Process ABRP FieldsTo set the Beacon Recovery ﬁeld To set the Retry Interval ﬁeld 4.3.3 The SNMP COMMUNITY NAMES ScreenSetting COM 1 and COM 2 Applications To set the Number of Retries ﬁeldRead-Write The user can view all LM ﬁelds and can edit all but the Editing the Community Name ﬁeld 4.3.4 The SNMP TRAPS ScreenAccess Policy Community NameTrap Community Name Enable TrapsSetting SNMP Traps Trap Destination4.3.5 The RING SECURITY Screen You can select from two modes of ring security Alarm Only NOTE The NMS receives each station added trap once only Security ModeSTATION ADDRESS Stn EditPREVIOUSSCREEN Changing the Security ModeSAVE/EXECUTE NEXTSCREENNOTE You cannot delete the Micro-MMAC-T address from the list Viewing the Revised Allowed ListAdding Stations to the STATION ADDRESS Allowed List Deleting Stations from the STATION ADDRESS Allowed ListDEVICE STATISTICS 4.3.6 The DEVICE STATISTICS ScreenFrames Received Selecting the Device Statistics Counter ModeUsing the ACCUMULATIVE Counter Mode Setting the Refresh FieldBurst Errors Errors ReceivedISOLATING ERRORS Line ErrorsRING INFORMATION AC ErrorsAbort Transmit Errors Internal ErrorsRing Number Ports EnabledNON-ISOLATING ERRORS Lost Frame ErrorsToken Errors 4.3.7 The CHASSIS STATUS VIEW ScreenFrame Copied Errors Rcvr Congestion ErrorsMode Port StatusVirtual Flexible Network Bus VFNB PREVIOUS Screen Mode StatusENABLE ALL PORTS ADMINISTRATIVE mode only NEXTSetting the REFRESH Field Using the OPERATIONAL Mode ScreenReturn key To display the status of RI/RO ports, BRIMs, or the MicroSNAC device To display the status of portsTo enable and disable select ports Using the ADMINISTRATIVE Mode ScreenTo reconnect a module to the token ring To enable all ports for all modulesUsing the RING OUT ENABLE Mode Screen To bypass all ports on a moduleTo switch to and from STN and RO 4.3.8 The COMPONENT STATUS ScreenFigure 4-13. COMPONENT STATUS VIEW Screen 4.3.9 The MIB NAVIGATOR ScreenTo access a list of MIB commands To get help on speciﬁc commandsTo escape from the MIB NAVIGATOR screen bran whoami Built-In commandsnext treesnmpget 4.3.10 The FLASH DOWNLOAD Screenping snmp branchTo chose the RUNTIME method Download Method ﬁeldFlash Image File Name To choose the BOOTPROM method2. Toggle from RUNTIME to BOOTPROM using the spacebar Flash Image Server IP5.1 USING LANVIEW LEDs CHAPTER TROUBLESHOOTING5.2 USING THE LCD DISPLAY Table 5-2. Static System Messages 5.2.1 Static System MessagesDisplayed 5.2.2 Alarm MessagesTROUBLESHOOTING Table 5-3. Alarm Messages5.2.3 Unsaved Initialization Messages Table 5-3. Alarm Messages ContTable 5-4. Unsaved Failure or Error Messages 5.2.4 Saved System Messages Table 5-5. Normal Unsaved Initialization MessagesTable 5-6. Saved System Messages 5.3 VIEWING POWER UP DIAGNOSTIC TESTS NOTE The LCD displays the following message whenever the POWERResponding to Error Messages To return to Local Management To execute a response optionFRENCH POWER SUPPLY CORDGERMAN SPANISH