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WIC-1DSU-T1 loopback ?

This is the first time I have installed a WIC-DSU-T1 card and I am unable to get loopback to work. With no T1 cable plugged in and depressing the loopback switch on the card should you get CD and should the alarm go away. I do not get CD so interface serial 0/0 stays down down.

Should software loopback using "loopback dte" behave the same as pressing the switch?

I am using a 2611 router. The only config to the interface was to assign IP address and no shutdown.


Re: WIC-1DSU-T1 loopback ?

Often times complex troubleshooting issues are best addressed in an interactive session with one of our trained technical assistance engineers. While other forum users may be able to help, it’s often difficult to do so for this type of issue.

To utilize the resources at our Technical Assistance Center, please visit and to open a case with one of our TAC engineers, visit

If anyone else in the forum has some advice, please reply to this thread.

Thank you for posting.

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