Table Of Contents
Catalyst 2820 Release Notes for the
8-Port 100BaseTX Repeater ModuleRedesigned Faceplate of the 8-Port 100BaseTX Repeater Module
Avoiding Problems with Token Ring Environments
Catalyst 2820 Release Notes for the
8-Port 100BaseTX Repeater Module
June 30, 1997
This document provides a description of the redesigned faceplate of the 8-Port 100BaseTX Repeater Module and provides information on how to avoid potential problems with shielded twisted-pair cabling in Token Ring environments.
The complete product documentation for this product is as follows:
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Catalyst 2820 and Catalyst 1900 User Guide
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Redesigned Faceplate of the 8-Port 100BaseTX Repeater Module
The faceplate of the Catalyst 2820 8-Port 100BaseTX Repeater Module () now has one port status LED above each 100BaseTX port and a single group status LED. describes the color and related port status indicated by the new port status LEDs. describes the color and related group status indicated by the new ACT/COL LED. The functional features, installation procedures, and connectivity information as provided in the Catalyst 2820 Modules User Guide still apply to this module.
Note
Figure 1
Catalyst 2820 8-Port 100BaseTX Repeater Module
Table 1 Port Status LED Description
Table 2 ACT/COL LED Description
Flashing green
Data being transmitted or received.
Flashing amber
Collision detected.
Off
No activity or no collisions detected.
Avoiding Problems with Token Ring Environments
Shielded twisted-pair (STP) cable is the most commonly used cable in Token Ring environments. The media interface connectors (MICs) and baluns—used to create network connections with STP and unshielded-twisted pair (UTP) cabling—create a loopback when they are disconnected; the loopback might cause anomalies with the switch.
To prevent loopback problems when using STP cabling in a Token Ring network environment, make sure the MICs and baluns are never left unconnected when they are part of a link connected to the switch (see ).
Figure 2 STP Cable Connections
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Note
78-4400-01 Rev. A0
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