Nothing wrong with that except the Ext in question is an OPX on the end of a 150' 2 Pr berried cable run so there's no spare cable available. I kind of wanted to get the port working as it should.

I did try another set and same problem. I don't have another 171 module to try and don't think it's bad because it does work on the analog pair.

Does the 171 have issues with long cable runs? There doesn't seem to be any grounds on the cable and the protectors have been lifted as a test.