I
Also what are the standard pairings on CAT5 for sthe standard PC router
ethernet signals?

Assuming the router uses EIA/TIA 568B (which is the most common)

white/orange = Transmit Data +
orange/white = Transmit Data -
white/green = Receive Data +
blue/white = Spare
white/blue = Spare
green/white = Receive Data -
white/brown = Spare
brown/white = Spare

Interesting that. The Brown pair are used sometimes for power over
ethernet are they not?. Tried to put a temporary phone line down a brown
pair this afternoon on a cat5 data cable, but it was shorted out by
something in the netgear router connected on that line?...
--
Tony Sayer