Hi List. I'm running the patlooptest program I've found in dahdi_tools 2.1.0.2. The target is a TE121P board with a loopback cable inserted on the socket. I suppose that the loopback is working fine because I'm able to see the green led on and dahdi_tool reports no errors. When I run the patlooptest I've a lot of errors (the received values are completely different than the transmitted) and I would like to know if someone in the list had run this test with the TE121P board. This lets me understand if the problem is on my board. The setup I've is what I've found on http://kb.digium.com/entry/138/ for the E1. Thank you and best regards, Marco Signorini ======================INGEGNI Tech S.r.l. http://www.ingegnitech.com