We have 2 building split by a small driveway. We have phone lines brought in and terminated with phone system in building A. We have a 66 block with 25 pair terminated in building A going underground to building b where it is terminated again to a 66 block.

Station lines already run terminated to 66 block and cross connect wires to 25 pair block.

Plug in station phones and nothing. They are dead.

So to troubleshoot I terminated a jack with pair 3/4 terminated back to building A. Punched down on block tested and phone turns up.

Went back to building B, terminated to 25 pair 66 block and nothing. So I pull one pair off and terminate the jack directly to the 25 pair. Plug in phone and voila, station turns up.

Why is it that one I terminate the 25 pair to 66 block and then terminate the cross connect going to the station blocks I get nothing.

Has me baffled. 25 pair is good coming into building B.