A common Cat5 straight through cable will work fine.

T1s use 1 and 2 (rx tip and ring) and 4 and 5 (tx tip and ring) for signals.

A T1 loopback plug would be wired 1 to 4 and 2 to 5.

They come in handy for testing T1 cards or for providing a hard loop for the telco.

Tom

At 05:42 PM 3/18/2007, you wrote:
Is there any technical difference between a T1 cable and a cat5e patch
cable as far as using them with Digium T1/E1 cards? Can PRI circuits
terminating at a smart jack connect successfully to Digium cards using
straight through CAT5e cables? If so, are they using all of the pins in
the cable?

Thanks in advance
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