Cisco Catalyst 2950 Hardware Installation Manual page 136

Diagnosing Problems
Table 4-1 Common Problems and Solutions (continued)
Symptom
STAT LED on
6
Catalyst 2950 LRE
is not turned on.
1. FCS = frame check sequence
2. GBIC = Gigabit Interface Converter
3. SFP = small form-factor pluggable
4. STP = Spanning Tree Protocol
5. CWDM = Coarse Wave Division Multiplexer
6. LRE = Long-Reach Ethernet
7. CPE = customer premises equipment
Catalyst 2950 Desktop Switch Hardware Installation Guide
4-6
Possible Cause
Telephone cable is loose or is not
switch connected properly.
Telephone cable is defective.
Cable trunking defective.
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.
Catalyst 2950 LRE switch does not
support the Cisco LRE CPE.
Chapter 4 Troubleshooting
Resolution
Reseat telephone cable into the
telephone wall jack and the
7
Cisco LRE CPE .
Replace the telephone cable.
Repair the cable trunking, or
select an alternative pair of
cables.
• Reduce cable length to
within the recommended
distances. (See the
Port" section on page 2-12
for LRE cabling
guidelines.)
Refer to the switch software
•
configuration guide for
information about verifying
LRE port link status.
See the compatibility matrix,
Table 2-1 on page 2-4, for more
information.
"LRE
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