Cabletron Systems MICROMMAC-22T, 42T manual Cable RECOMMENDATIONS/TROUBLESHOOTING, Crosstalk, Noise

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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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Contents Page Iii FCC Notice Cabletron SYSTEMS, INC. Program License Agreement United States Government Restricted Rights Contents Local Management TroubleshootingSaved System Messages Viewing Power UP Diagnostic Tests Chapter Introduction Contents OverviewMicroMMAC-T Overview Telnet MicroMMAC-T FeaturesLocal 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 Rmon MIB RFC 1271/1513 SupportGroup Subgroup Section Stackable Capabilities Typical Stackable Conﬁguration BRIDGING/ROUTING CapabilitiesBRIMs 1 SNA/WAN IntegrationRemote Management Capabilities Telnet CapabilitiesGetting Help Recommended ReadingMicroMMAC-T Ports/Cables Cable SpecificationsFrequency Impedance Attenuation UTP Cable SpeciﬁcationsAttenuation and Impedance UTP Voice Grade and Category 3 SpeciﬁcationsUTP Maximum Lobe Lengths Maximum Lobe LengthsType 3 Media Filters Maximum Number of StationsSTP Cable Speciﬁcations STP Cable SpeciﬁcationsTypes Frequency Impedance Attenuation STP Maximum Drive Distance Maximum Trunk LengthsSTP Maximum Lobe Lengths STP Cable Type Ring Speed MbpsCable Type Attenuation Maximum Drive Distance Mixed Cable TypesAttenuation Multimode Fiber Optic Cable SpeciﬁcationsSingle Mode Fiber Optic Cable Speciﬁcations Single Mode Fiber Optic Cable SpeciﬁcationsFiber Optic Budget Noise Cable RECOMMENDATIONS/TROUBLESHOOTINGTemperature CrosstalkCOM 1/COM 2 Ports COM Port SpecificationsTPIM-T1 Tpim SpecificationsUPS SlipTPIM-T1 Pinouts TPIM-T2TPIM-T4 Pinouts TPIM-F2Parameter Typical Minimum Maximum TPIM-F3TPIM-F2 Speciﬁcations Parameter Typical Worst Case Value BudgetREQUIREMENTS/SPECIFICATIONS Environmental Requirements General SpecificationsPower Supply Requirements Output Min. Load Max. Load Max PowerSafety ServicePhysical Attaching the Strain Relief Bracket Unpacking the MicroMMAC-TRack-Mounting the MicroMMAC-T Installing the MicroMMAC-TWall-Mounting the MicroMMAC-T Installing of Rack-Mount BracketsWall-Mounting the MicroMMAC-T Free-Standing Installation Connecting to a Power SourceResetting the MICROMMAC-T Setting the Ring Speed To reset the MicroMMAC-TTo change the ring speed To restore MicroMMAC-T parameters to the factory defaults Setting the Nvram SwitchRJ45 Plug MIC Connector Connecting Lobe Port CablingAt TCU At device port RJ45 Plug10. UTP Conﬁguration Example 11. STP Conﬁguration Example To attach a lobe segment to a MicroMMAC-T network portInstalling Tpim Modules Signal RJ45 DB9 Ring-In Ring-OutPinout Cross-Reference for TPIMs Setting Phantom and RI/RO Switches To install a TPIM, perform the following steps Tpim InstallationTo connect a TPIM-T1 to a Twisted Pair Segment Connecting STP SegmentsTo connect a segment to a TPIM-T2/-T4 Connecting Twisted Pair Segments16. The TPIM-T2/-T4 Connecting Fiber Optic Link Segments17. The TPIM-F2/-F3 To connect a ﬁber optic link segment to the TPIM-F2 /-F3To check MicroMMAC-T installation Checking the InstallationUse Local Management to Do the Following Management Terminal RequirementsManagement Terminal Setup Parameters Attaching the Management TerminalTo attach a management terminal to the MicroMMAC-T Modem Cable Conﬁguration and Setup Terminal Settings for LM TerminalMenu Function Selection To access Local Management Accessing Local ManagementMicroMMAC-TLocal Management Screen Accessing Local Management via TelnetMain Menu Screen Accessing Local Management from a ModemUsing Local Management Setup Menu ScreenSetting or Modifying Local Management Screen Fields Working with Local Management ScreensSelecting a Menu Screen Option Exiting Your Local Management Session Exiting a Local Management ScreenSystem Level Screen Setting the System DateSetting the Host IP Address Setting the System TimeTo modify the Subnet Mask Modifying the Subnet MaskSetting the Default Gateway To set the Default GatewaySetting Automatic Beacon Recovery Process Abrp Fields To set the Beacon Recovery ﬁeld To set the Retry Interval ﬁeld Setting COM 1 and COM 2 ApplicationsSnmp Community Names Screen To set the Number of Retries ﬁeldSnmp Community Names Screen Editing the Community Name ﬁeld Access PolicySnmp Traps Screen Community NameTrap Community Name Enable TrapsSetting Snmp Traps Trap DestinationRing Security Screen Ring Security Screen Security Mode Station AddressStn Edit Return SAVE/EXECUTENextscreen PreviousscreenViewing the Revised Allowed List Adding Stations to the Station Address Allowed ListDeleting Stations from the Station Address Allowed List Device Statistics Device Statistics ScreenSelecting the Device Statistics Counter Mode Using the Accumulative Counter ModeSetting the Refresh Field Isolating Errors Errors ReceivedRing Information AC ErrorsLost Frame Errors NON-ISOLATING ErrorsChassis Status View Screen Frame Copied ErrorsMode Next 10. Chassis Status View Operational Screen Using the Operational Mode ScreenTo display the status of ports To 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 moduleComponent Status Screen To switch to and from STN and RO13. Component Status View Screen MIB Navigator ScreenTo access a list of MIB commands To get help on speciﬁc commandsTo escape from the MIB Navigator screen Navigational commands MIB CommandsNavigation Built-In Special Set Built-In commandsTo download a Flash image Flash Download ScreenTo chose the Runtime method Download Method ﬁeldToggle from Runtime to Bootprom using the spacebar To choose the Bootprom methodLanview Leds Using Lanview LEDsLCD Display Using the LCD DisplayStatic System Messages Static System MessagesDisplayed Message Signiﬁcance Alarm Messages Alarm MessagesDisplayed Signiﬁcance Messages Unsaved Initialization Messages Unsaved Failure or Error MessagesDisplayed Message Saved System MessagesNormal Unsaved Initialization Messages Saved System MessagesResponding to Error Messages Viewing Power UP Diagnostic TestsTo return to Local Management To execute a response optionPower Supply Cord