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132 APPENDIX A: TROUBLESHOOTING
Errors Indicated by
the WAN LEDs
This section describes how the WAN LEDs indicate errors on systems
using ISDN or CSU/DSU connections.
Meaning: Indicates a loss of signal, possibly due to a disconnected
cable.
Action: Check all cable connections.
Meaning: An error in received frames has been detected on either
channel B1 or channel B2.
Connect
Fault
(CSU/DSU)
B1
Link
Line
Act
Line
Error
WAN
B2
Amber
Connect
Fault
(CSU/DSU)
B1
Link
Line
Act
Line
Error
WAN
B2
Amber