Cisco 2950 Hardware Installation Guide - Page 90

Diagnosing Problems Chapter 3 Troubleshooting Table 3-1 Common Problems and Solutions (continued) Symptom Possible Cause Resolution Switch placed in error-disabled state after CWDM3 GBIC or SFP module is inserted. Bad or non-Cisco-approved CWDM GBIC module or SFP module. Remove the CWDM GBIC or SFP module from the switch, and replace it with a Cisco-approved module. Use the errdisable recovery cause gbic-invalid global configuration command to verify port status, and enter a time interval to recover from the error-disabled state. See the switch software configuration guide for information about the errdisable recovery command. STAT LED on Catalyst 2950 Telephone cable is loose or is not LRE switch is not on. connected properly. Reseat telephone cable into the telephone wall jack and the Cisco LRE CPE4. Telephone cable is defective. Replace the telephone cable. Cable trunking defective. Repair the cable trunking, or select an alternative pair of cables. Cisco LRE CPE is not communicating with Catalyst 2950 LRE switch, or Cisco LRE CPE might be attempting to exceed the rate or the reach selected by the switch. • Reduce cable length to within the recommended distances. (See the "LRE Port" section on page 1-9 for LRE cabling guidelines.) • See the switch software configuration guide for information about verifying LRE port link status. Catalyst 2950 LRE switch does not See the compatibility matrix, support the Cisco LRE CPE. Table 1-1 on page 1-3, for more information. 1. FCS = frame check sequence 2. STP = Spanning Tree Protocol 3. CWDM = Coarse Wave Division Multiplexer 4. CPE = customer premises equipment Catalyst 2950 Switch Hardware Installation Guide 3-4 OL-6156-01