No Carrier Detect T1 CSU/DSU WIC 2600 Router

Unanswered Question
May 3rd, 2007

When we loopback the WIC, the far end sees a good connection, but when the loopback is released, the CD LED goes out.

Crossed wires maybe?

It's a remote site, so I have not double checked yet.

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Paolo Bevilacqua Thu, 05/10/2007 - 12:36

Yes, crossed wires would behave like that.

hope this helps, please rate post if it does!

KEVALSONP Thu, 05/10/2007 - 12:37

I will check.

It will be not this Friday, but next.

I will post back what I find.


scottmac Thu, 05/10/2007 - 13:53

Protocol mismatch would also behave like that (i.e., PPP on one side, HDLC or Frame-Relay on the other).

Good Luck


Paolo Bevilacqua Thu, 05/10/2007 - 14:04

Scott, I wouldn't agree. On a L2 protocol mismatch you will have LEDs OK, controller and interface up, line protocol down.


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