We are trying to establish QSIG connections between our Nortel Option 81C and Cisco 3845.
We are able to get layer 1 "active" ( shows via show ISDN status).
But layer 2 ISDN will not establish (keeps going between TEI_ASSIGNED and AWAITING_ESTABLISHMENT). Nortel guys say their side is setup correctly.
I want to get back to basics and make sure the cable is correct. What we have connected on Nortel T1 port is a DA-15 which on the rear side has interface for RJ connection. From the rear of that DA-15 we have a T1 cross-over cable (i..e in rear of DA-15 pins 1,2, 4,5 and other end connecting into T1 port on 3845 is pins 4,5 1,2). We validated with Cable tester that pins are crossed.
Is this the correct cabling? We tried at first just straight through, and could not establish layer 1. As soon as we connected with above, layer 1 established (but not layer 2).
Thanks in advance,