I moved an ESI 128 and the T-1 Cable came off of the 66 block and am not sure the Pinout The 25pr that services this has Stations etc. on it in the first slot of the first Cabinet . I am told the xmit is v/bn pin 1&2 on rj45 and rec is v/sl 4&5 on rj45 is this correct ?

From your description you must be referring to a DLC12 Port Card. There are other port cards for that system so make sure that is the case.

If yes to the DLC12 Port Card then:

Violet/Brown is TX-Tip
Brown/Violet is TX-Ring

Violet/Slate is RX-Tip
Slate/Violet is RX-Ring

hmmmmm didn't know they put DLC12's in a S-Class's?!

kidding, I'm a kidder!!!!

Having more knowledge than certification documents may indicate has always been an asset. It has been referred to in the past as:

"What separates the Men from the Boys" :toast:

Thank You Gentlemen !