This article discusses a wiring strategy for thin-wire Ethernet cabling (RG58U
cable) and the Macintosh II EtherTalk card.
Basically, RG58U cable must always loop through the wall plate (via a BNC
connector). If no computer is present, pass the cable out through one hole in
the plate and then back in through the other hole (the pass-through loop
strategy).
If a computer is present, run the cable out to a T-connector mounted directly
on the back of the computer and connect it to the T-connector. (Important:
Xerox says that the T-connector MUST be within 1/2 inch of the card.) Run the
continuing cable from the other side of the T-connector back through the second
hole in the wall plate.