132APPENDIX A: TROUBLESHOOTING

Errors Indicated by This section describes how the WAN LEDs indicate errors on systems the WAN LEDs using ISDN or CSU/DSU connections.

WAN

(CSU/DSU)

 

Line

B1 B2

 

Link

 

Act

 

Connect

 

Line

Amber

Fault

Error

 

Meaning: Indicates a loss of signal, possibly due to a disconnected cable.

Action: Check all cable connections.

WAN

(CSU/DSU)

B1 B2

Line

Link

Act

 

Line

Connect

Error Amber Fault

Meaning: An error in received frames has been detected on either channel B1 or channel B2.

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3Com SuperStack II, NETBuilder SI manual Wan