The last afternoon I wasted many hours on this inter-connection !

I had to connect a brand new Avaya Nortel BCM 450 to Cisco 2821 in the ISDN/E1 plug. After several tests I found that it is not possible to use a standard cable of any type.

I had googled and found the post in linkografia, with success: below is the complete pin-connection.

Plug1

1: White/Orange
2: Orange
3: White/Green
4: Blue
5: White/Blue
6: Green
7: White/Brown
8: Brown

Plug2

1: Blue
2: White/Blue
3: Green
4: White/Orange
5: Orange
6: White/Green
7: White/Brown
8: Brown

Linkografia
T1 Crossover Cable from Chris’ CCVP Weblog

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