Cisco Catalyst WS-X3001 Installation And Configuration Manual page 24

Cabling the 100VG Module
Figure 16
Troubleshooting
If the 100VG module is not working properly, the following problems may exist:
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24 Catalyst Matrix and Expansion Module Installation and Configuration Guide
Fiber-Optic Cable Connection
Check all cabling and connections (including patch panels) to see if the connections to the
transceiver are broken or faulty.
Check for proper cable polarity.
Check if a connected device is not transmitting the signal.
Check that the connection is to a 100VG device such as a 10/100VG PCI LAN Adapter (see the
networking device's manual for more information).