I'm stumped with an existing wiring configuration at one of our offices. We have 2 buildings that are connected with a 25 pair going to 66 Block on each side. Management says that the phones used to work in the 2nd building and after some time of not being used we are now looking to put staff back in this location.

I've traced the wiring and found that it is terminated at each end on the 66 Blocks. I confirmed on one end that the cabling appears to be correct going into the phone system.

In the other building i'm wondering if the jacks are terminated correctly. They are currently terminated with only the middle pair using blue/blue white.

I'm just wondering is there a way I can check right at the block by terminating a jack to the block to test the phone? Right now none of the jacks are working. All phones are blank.