I have a situation similar to Arthur's: Customer has two steel buildings about 15'-20' apart. They're only now planning computer connectivity to the "lower" building and I've talked them into fiber and media converters. Oh, I've also talked them into some protection for the phone lines between the buildings (currently no protection, or more properly, no current protection, and they are just about at the highest point in the state, on top of a hill, in the middle of a field. I don't see any potential problems here!).
To answer Arthur's initial question, even if you used the 66-Blocks as you originally proposed, I would think that the circuit would work well, although it may not certify.
