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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:
The faceplate of the Catalyst 2820 8-Port 100BaseTX Repeater Module (Figure 1) now has one port status LED above each 100BaseTX port and a single group status LED. Table 1 describes the color and related port status indicated by the new port status LEDs. Table 2 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.
| Color | Port Status |
|---|---|
| Flashing green | Link operational (with receive activity). |
| Solid green | Link operational (with no activity). |
| Flashing amber | Port disabled (due to a jabber or autopartition error). |
| Solid amber | Port disabled (by a network connection error or secure address violation or through the management console). |
| Off | No link. |
| Color | Port Status |
|---|---|
| Flashing green | Data being transmitted or received. |
| Flashing amber | Collision detected. |
| Off | No activity or no collisions detected. |
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).
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