I got VConsole ISDN simulator. and the simulator works with U interface. when I connect to 2520 BRI, layer1,2,3 don't work. no light, no flash, nothing. how to diagnose the BRI of 2520? thanks
I went through this some month back. The BRI interface on the 2520 is a ST interface. I had to purchase a Adtran NT1 ACE device. This will convert the U connection from the Telco side to ST connection. Here is a link about the 2520.
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