Noise on PRI
We have a new comcast PRI that requires an RJ48C spec'd cable plugged into an Adtran.
I have a cable we used when we set it up. It works but there is lots of crackling noise on the line (only incoming...outside callers hear us fine).
I ordered another cable to that spec. It cleared up the noise but outside calls could no longer route in. The only difference in pinouts was cable #1 has empty pins 3,6,7,8 per the spec. Then cable #2 has wire in those pins although they aren't paired...they are only paired per spec. Thinking this may have been the issue, I ordered a 3rd cable custom made per comcast spec in our service sheet.
This cable is identical in pinout and everything as cable #1, just with shielded connectors. However, when I plug it up to the Adran, the light stays red on our Net 0/3 port.
Any ideas why this would be?