Remote Audio boom cable system & SD442

This follows up on an earlier thread here.

Since the SD442 can perform some basic boom op private-line functions
(TA3 for talk-out and return-B for talk-in), anybody know the pinouts
necessary to adapt the Remote Audio boom cable system for this
application. I'm guessing that one could just split the Comm XLR
connector on the mixer end out into pin-1 + pin-2 for one channel, and
pin-1 + pin-3 for the other. But then... which is which?

Also, anyone know if a standard multi-pair beta-breakaway cable
extension, with 8-pin Neutricon connectors on each end (a la Remote
Audio, PSC, etc.) can sub into this boom op system when longer runs are
needed in a pinch?

Muchas gracias,
ben lowry