Cabletron Systems 24, STHI-44, STH-22, 42 manual Operating Specifications, Ring Speed

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Operating Specifications

On STH models -42/-44, each RJ45 connector is encased in a metallic shield which provides a means of connection for the STP cable shield. Shield continuity is maintained by contacts within the female RJ45 that contact the metallic casing of the male RJ45 on the STP lobe cabling.

Shielded patch cables that adapt a shielded RJ45 to a Media Interface Connector (MIC) are available from Cabletron Systems in eight-foot lengths. These adapter/patch cables permit connection to an existing patch panel equipped with MICs.

2.6Operating Specifications

Cabletron Systems reserves the right to change these specifications at any time without notice.

2.6.1Ring Speed

The operating ring speed for the STH hub may be set via the Ring Speed Switch on the front face of the STH or by MIB commands from an intelligent hub.

If the STH hub has had no connection to any intelligent hub since power- up, the Ring Speed switch effects immediate changes in the hub’s ring speed. Under normal conditions, however (when the STH is being managed by an intelligent hub), the STH hub’s Ring Speed switch setting is read only at power-up. In order to change the STH hub’s ring speed via the Ring Speed switch, the user must change the switch setting and power-cycle the STH (unplug its power cord and plug it in again).

MIB commands from intelligent hubs override the Ring Speed switch setting. Once the switch setting has been overridden, the MIB command ring speed setting will remain in effect at all subsequent power-ups as long as the switch setting on the STH is not changed. MIB commands are accessible through the MIB Navigator screen on the intelligent hub’s Local Management application and through other SNMP network management software packages including Cabletron Systems’ Remote LANVIEW® / Windows.

The user may cancel the MIB override and regain switch control over the STH hub’s ring speed by changing the current switch position and power-cycling the STH.

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Contents Stackable Token Ring HUB USER’S Guide Page DOC Notice FCC NoticeCabletron Software Program License Cabletron SYSTEMS, INC Program License AgreementExclusion of Warranty Disclaimer of Liability United States Government Restricted Rights Contents Troubleshooting InstallationSTH Overview Using This ManualIntroduction HubSTACK STH OverviewLanview LEDs Lobe Port and Multiple Ring Out Port ConfigurationsRing Speed Fault Protection Lanview LEDsActive Circuitry Automatic Beacon Recovery ProcessDaughter Board Upgrade Kit Automatic Beacon Recovery ProcessNo Connection Redundancy Related ManualsRelated Manuals Improved Protection from BeaconingDAISY-CHAIN MAU Configuration Getting Help Getting HelpCrosstalk Requirements & SpecificationsGeneral Considerations Maximum Number of Stations on a RingGeneral Considerations TemperatureInstallation Recommendations UTP Cable Categories Cable SpecificationsUTP Cabling Specifications Cable SpecificationsNext UTP Cable Categories UTP Lobe Lengths STP Cabling Specifications UTP Lobe Lengths STP Lobe Lengths STP Cable CategoriesSTP Cable Categories TCU Specifications TCU SpecificationsRing Speed Operating SpecificationsOperating Specifications Ring Sequence Power Supply RequirementsRing Sequence Physical SafetyEnvironmental Requirements Environmental RequirementsRack Mount or Wall Mount Hardware InstallationInstalling the STH Unpacking the STHAdding the STH to a Stack Adding the STH to a StackRack-Mounting the STH Attaching the Strain Relief BracketAttaching the Strain Relief Bracket Wall-Mounting the STH Wall-Mounting the STHWall-Mounting the STH Free-Standing Installation Free-Standing InstallationAttaching Network Cabling to TCU Ports Connecting the STH to the Power SourceConnecting the STH to the Power Source Finishing the Installation Finishing the InstallationTrouble Resolution TroubleshootingLanview LED Signals Ring Speed Fault Trouble ResolutionLoss Of Power Failure to Link on Enabled Port
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