Cabletron Systems 42T, MICROMMAC Single Mode Fiber Optic Cable Speciﬁcations, Fiber Optic Budget

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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.

2.1.4 Single Mode Fiber Optic Cable Speciﬁcations

Table 2-7 shows speciﬁcations for the Single Mode Fiber Optic Cable supported by TPIM-F3.

Table 2-7. Single Mode Fiber Optic Cable Speciﬁcations

Cable Type	Attenuation	Maximum Drive Distance


8/125-12/125 ∝m	10.0 dB or less	The max. allowable ﬁber optic
		cable length is 10 km (10936
		yards). However, IEEE 802.5
		specs allow for a max. of 1 km
		(1093.6 yards).

Maximum Trunk Lengths

The maximum trunk cable length between the MicroMMAC-T and other active devices is equal to the Maximum Drive Distance as shown in Table 2-7. For passive devices, the combined length of twice the longest trunk cable plus the longest lobe cable attached to the passive ring segment must not exceed the Maximum Drive Distance Trunk Length.

Attenuation

Fiber optic cable must be tested with an attenuation test set adjusted for a 1300 nm wavelength. This test ensures that the cable’s signal loss is within an acceptable range of 10 dB or less for any given single mode ﬁber optic link.

2-7

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Contents Page Iii FCC Notice Cabletron SYSTEMS, INC. Program License Agreement United States Government Restricted Rights Contents Troubleshooting Local ManagementSaved System Messages Viewing Power UP Diagnostic Tests Contents Overview Chapter IntroductionMicroMMAC-T Overview MicroMMAC-T Features TelnetActive TCU Ports Cable Signal PolaritySpeed Fault Protection Local ManagementFlash Eeprom Ring Speed SwitchCabletron’s Distributed LAN Monitor Mode Lanview LEDsLCD and LCD Display Button Reset ButtonCOM Port Applications MIB SupportGroup Subgroup Section Rmon MIB SupportRmon MIB RFC 1271/1513 Support Stackable Capabilities BRIDGING/ROUTING Capabilities Typical Stackable ConﬁgurationTelnet Capabilities 1 SNA/WAN IntegrationRemote Management Capabilities BRIMsRecommended Reading Getting HelpCable Specifications MicroMMAC-T Ports/CablesUTP Voice Grade and Category 3 Speciﬁcations UTP Cable SpeciﬁcationsAttenuation and Impedance Frequency Impedance AttenuationMaximum Number of Stations Maximum Lobe LengthsType 3 Media Filters UTP Maximum Lobe LengthsTypes Frequency Impedance Attenuation STP Cable SpeciﬁcationsSTP Cable Speciﬁcations STP Cable Type Ring Speed Mbps Maximum Trunk LengthsSTP Maximum Lobe Lengths STP Maximum Drive DistanceMultimode Fiber Optic Cable Speciﬁcations Mixed Cable TypesAttenuation Cable Type Attenuation Maximum Drive DistanceFiber Optic Budget Single Mode Fiber Optic Cable SpeciﬁcationsSingle Mode Fiber Optic Cable Speciﬁcations Crosstalk Cable RECOMMENDATIONS/TROUBLESHOOTINGTemperature NoiseCOM Port Specifications COM 1/COM 2 PortsSlip Tpim SpecificationsUPS TPIM-T1TPIM-T2 TPIM-T1 PinoutsTPIM-F2 TPIM-T4 PinoutsParameter Typical Worst Case Value Budget TPIM-F3TPIM-F2 Speciﬁcations Parameter Typical Minimum MaximumREQUIREMENTS/SPECIFICATIONS Output Min. Load Max. Load Max Power General SpecificationsPower Supply Requirements Environmental RequirementsPhysical SafetyService Unpacking the MicroMMAC-T Attaching the Strain Relief BracketInstalling the MicroMMAC-T Rack-Mounting the MicroMMAC-TInstalling of Rack-Mount Brackets Wall-Mounting the MicroMMAC-TWall-Mounting the MicroMMAC-T Resetting the MICROMMAC-T Free-Standing InstallationConnecting to a Power Source To change the ring speed Setting the Ring SpeedTo reset the MicroMMAC-T Setting the Nvram Switch To restore MicroMMAC-T parameters to the factory defaultsConnecting Lobe Port Cabling RJ45 Plug MIC ConnectorRJ45 Plug At TCU At device port10. UTP Conﬁguration Example To attach a lobe segment to a MicroMMAC-T network port 11. STP Conﬁguration ExamplePinout Cross-Reference for TPIMs Installing Tpim ModulesSignal RJ45 DB9 Ring-In Ring-Out Setting Phantom and RI/RO Switches Tpim Installation To install a TPIM, perform the following stepsConnecting STP Segments To connect a TPIM-T1 to a Twisted Pair SegmentConnecting Twisted Pair Segments To connect a segment to a TPIM-T2/-T4Connecting Fiber Optic Link Segments 16. The TPIM-T2/-T4To connect a ﬁber optic link segment to the TPIM-F2 /-F3 17. The TPIM-F2/-F3Checking the Installation To check MicroMMAC-T installationManagement Terminal Requirements Use Local Management to Do the FollowingTo attach a management terminal to the MicroMMAC-T Management Terminal Setup ParametersAttaching the Management Terminal Menu Function Selection Modem Cable Conﬁguration and SetupTerminal Settings for LM Terminal Accessing Local Management To access Local ManagementAccessing Local Management via Telnet MicroMMAC-TLocal Management ScreenSetup Menu Screen Accessing Local Management from a ModemUsing Local Management Main Menu ScreenSelecting a Menu Screen Option Setting or Modifying Local Management Screen FieldsWorking with Local Management Screens Exiting a Local Management Screen Exiting Your Local Management SessionSetting the System Date System Level ScreenSetting the System Time Setting the Host IP AddressModifying the Subnet Mask To modify the Subnet MaskSetting Automatic Beacon Recovery Process Abrp Fields Setting the Default GatewayTo set the Default Gateway To set the Beacon Recovery ﬁeld To set the Number of Retries ﬁeld Setting COM 1 and COM 2 ApplicationsSnmp Community Names Screen To set the Retry Interval ﬁeldSnmp Community Names Screen Community Name Access PolicySnmp Traps Screen Editing the Community Name ﬁeldTrap Destination Enable TrapsSetting Snmp Traps Trap Community NameRing Security Screen Ring Security Screen Stn Edit Security ModeStation Address Previousscreen SAVE/EXECUTENextscreen ReturnDeleting Stations from the Station Address Allowed List Viewing the Revised Allowed ListAdding Stations to the Station Address Allowed List Device Statistics Screen Device StatisticsSetting the Refresh Field Selecting the Device Statistics Counter ModeUsing the Accumulative Counter Mode Errors Received Isolating ErrorsAC Errors Ring InformationNON-ISOLATING Errors Lost Frame ErrorsFrame Copied Errors Chassis Status View ScreenMode Next Using the Operational Mode Screen 10. Chassis Status View Operational ScreenTo display the status of ports Using the Administrative Mode Screen To enable and disable select portsTo bypass all ports on a module To enable all ports for all modulesUsing the Ring OUT Enable Mode Screen To reconnect a module to the token ringTo switch to and from STN and RO Component Status ScreenMIB Navigator Screen 13. Component Status View ScreenTo escape from the MIB Navigator screen To access a list of MIB commandsTo get help on speciﬁc commands Navigation Built-In Special Navigational commandsMIB Commands Built-In commands SetFlash Download Screen To download a Flash imageDownload Method ﬁeld To chose the Runtime methodTo choose the Bootprom method Toggle from Runtime to Bootprom using the spacebarUsing Lanview LEDs Lanview LedsUsing the LCD Display LCD DisplayDisplayed Message Signiﬁcance Static System MessagesStatic System Messages Displayed Signiﬁcance Messages Alarm MessagesAlarm Messages Unsaved Failure or Error Messages Unsaved Initialization MessagesSaved System Messages Saved System MessagesNormal Unsaved Initialization Messages Displayed MessageViewing Power UP Diagnostic Tests Responding to Error MessagesTo execute a response option To return to Local ManagementPower Supply Cord