Re: (PM) Diff betw T1-Span & Ethernet Cables?

Matthew S. Crocker (matthew@crocker.com)
Sun, 16 Nov 1997 16:10:08 -0500 (EST)

> I didn't mean to imply that you should split the pairs up :-) I think
> both Ethernet and T1 pair things properly it's just that the pairs are not
> next to each other on the connector. The 1st pair is usually pins (1,2) the
> second pair (3,6) the third pair (4,5) and the fourth pair (7,8) on the
> RJ45. Not sure why they did that in the first place but I suppose we have
> beat this subject about to death now.

They split the second pair to make the third pair ride in the center pins.
The center two pins are 'reserved' for POTS service in an rj48c and need
to be on the same pair.

-Matt

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Matthew S. Crocker 
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