Crosstalk, Noise, Temperature | Cabletron Systems MICROMMAC-22T

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, 42T manual Cable RECOMMENDATIONS/TROUBLESHOOTING, Crosstalk, Noise, Temperature

Contents

Page Iii FCC Notice Cabletron SYSTEMS, INC. Program License Agreement United States Government Restricted Rights Contents Local Management Troubleshooting Saved System Messages Viewing Power UP Diagnostic Tests Chapter Introduction Contents Overview MicroMMAC-T Overview Telnet MicroMMAC-T Features Local Management Cable Signal PolaritySpeed Fault Protection Active TCU Ports Lanview LEDs Ring Speed SwitchCabletron’s Distributed LAN Monitor Mode Flash Eeprom MIB Support Reset ButtonCOM Port Applications LCD and LCD Display Button Rmon MIB Support Rmon MIB RFC 1271/1513 SupportGroup Subgroup Section Stackable Capabilities Typical Stackable Conﬁguration BRIDGING/ROUTING Capabilities BRIMs 1 SNA/WAN IntegrationRemote Management Capabilities Telnet Capabilities Getting Help Recommended Reading MicroMMAC-T Ports/Cables Cable Specifications Frequency Impedance Attenuation UTP Cable SpeciﬁcationsAttenuation and Impedance UTP Voice Grade and Category 3 Speciﬁcations UTP Maximum Lobe Lengths Maximum Lobe LengthsType 3 Media Filters Maximum Number of Stations STP Cable Speciﬁcations STP Cable SpeciﬁcationsTypes Frequency Impedance Attenuation STP Maximum Drive Distance Maximum Trunk LengthsSTP Maximum Lobe Lengths STP Cable Type Ring Speed Mbps Cable Type Attenuation Maximum Drive Distance Mixed Cable TypesAttenuation Multimode Fiber Optic Cable Speciﬁcations Single Mode Fiber Optic Cable Speciﬁcations Single Mode Fiber Optic Cable SpeciﬁcationsFiber Optic Budget Noise Cable RECOMMENDATIONS/TROUBLESHOOTINGTemperature Crosstalk COM 1/COM 2 Ports COM Port Specifications TPIM-T1 Tpim SpecificationsUPS Slip TPIM-T1 Pinouts TPIM-T2 TPIM-T4 Pinouts TPIM-F2 Parameter Typical Minimum Maximum TPIM-F3TPIM-F2 Speciﬁcations Parameter Typical Worst Case Value Budget REQUIREMENTS/SPECIFICATIONS Environmental Requirements General SpecificationsPower Supply Requirements Output Min. Load Max. Load Max Power Safety ServicePhysical Attaching the Strain Relief Bracket Unpacking the MicroMMAC-T Rack-Mounting the MicroMMAC-T Installing the MicroMMAC-T Wall-Mounting the MicroMMAC-T Installing of Rack-Mount Brackets Wall-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 Switch RJ45 Plug MIC Connector Connecting Lobe Port Cabling At TCU At device port RJ45 Plug 10. UTP Conﬁguration Example 11. STP Conﬁguration Example To attach a lobe segment to a MicroMMAC-T network port Installing 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 Installation To connect a TPIM-T1 to a Twisted Pair Segment Connecting STP Segments To connect a segment to a TPIM-T2/-T4 Connecting Twisted Pair Segments 16. The TPIM-T2/-T4 Connecting Fiber Optic Link Segments 17. The TPIM-F2/-F3 To connect a ﬁber optic link segment to the TPIM-F2 /-F3 To check MicroMMAC-T installation Checking the Installation Use Local Management to Do the Following Management Terminal Requirements Management 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 Management MicroMMAC-TLocal Management Screen Accessing Local Management via Telnet Main Menu Screen Accessing Local Management from a ModemUsing Local Management Setup Menu Screen Setting or Modifying Local Management Screen Fields Working with Local Management ScreensSelecting a Menu Screen Option Exiting Your Local Management Session Exiting a Local Management Screen System Level Screen Setting the System Date Setting the Host IP Address Setting the System Time To modify the Subnet Mask Modifying the Subnet Mask Setting 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 ﬁeld Snmp Community Names Screen Editing the Community Name ﬁeld Access PolicySnmp Traps Screen Community Name Trap Community Name Enable TrapsSetting Snmp Traps Trap Destination Ring Security Screen Ring Security Screen Security Mode Station AddressStn Edit Return SAVE/EXECUTENextscreen Previousscreen Viewing the Revised Allowed List Adding Stations to the Station Address Allowed ListDeleting Stations from the Station Address Allowed List Device Statistics Device Statistics Screen Selecting the Device Statistics Counter Mode Using the Accumulative Counter ModeSetting the Refresh Field Isolating Errors Errors Received Ring Information AC Errors Lost Frame Errors NON-ISOLATING Errors Chassis Status View Screen Frame Copied Errors Mode Next 10. Chassis Status View Operational Screen Using the Operational Mode Screen To display the status of ports To enable and disable select ports Using the Administrative Mode Screen To 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 module Component Status Screen To switch to and from STN and RO 13. Component Status View Screen MIB Navigator Screen To 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 commands To download a Flash image Flash Download Screen To chose the Runtime method Download Method ﬁeld Toggle from Runtime to Bootprom using the spacebar To choose the Bootprom method Lanview Leds Using Lanview LEDs LCD Display Using the LCD Display Static System Messages Static System MessagesDisplayed Message Signiﬁcance Alarm Messages Alarm MessagesDisplayed Signiﬁcance Messages Unsaved Initialization Messages Unsaved Failure or Error Messages Displayed Message Saved System MessagesNormal Unsaved Initialization Messages Saved System Messages Responding to Error Messages Viewing Power UP Diagnostic Tests To return to Local Management To execute a response option Power Supply Cord