I have an outbuilding with direct bury cat-5 cable connecting the outbuilding to the main-building.The
distance of the run is about 630ft. We are using a Panasonic KX-TG9582G Dect 6.0 wireless system in the main-building and have AT&T wired hand-sets in the out-building.

Whenever this wire is punched down into the 66 block with the rest of the extensions, we get an audible buzz on the line from any extension in the main-building and the outbuilding. I thought it may be grounding related, but i am not sure.

I tested continuity of the pairs and there is no cross wired or shorts between the pairs and i tried different pairs with the same result.

Any help would be appreciated!

Bob