Switch User's Guide

Troubleshooting
208 CSX400 and CSX400-DC User’s Guide
Troubleshooting CSX400 Hardware
Power (PWR) LED is OFF
• Check that the power connection is firmly attached to the back panel of the CSX400, and the
other end to an active power source.
Processor (CPU) LED is OFF
If the CPU stays OFF for an extended amount of time, and the power (PWR) light remains on, the
CPU is in an unknown state.
• Contact Cabletron Systems Global Call Center for technical support (refer to Getting Help in
Chapter 1).
Processor (CPU) LED is RED
The processor has detected a fault condition.
• Contact Cabletron Systems Technical Support (refer to Getting Help in Chapter 1).
Troubleshooting the LAN
Collision (CLN) LED is RED
Collisions are normal in an Ethernet network, however, increased collisions may indicate that the
network is out of specification (the propagation delay between two nodes on the network exceeds
25.6 µs).
Link (LNK) LED is OFF
• Check that the CSX400 and the device at the other end of the segment are powered up.
• Verify that the RJ45 connectors on the twisted pair segment have the correct pinouts.
• Check the cable for continuity.
• Check that the cable meets the specifications for dB loss.