> I've never bothered to check to see if cat5 cables use the appropriate > mating twisted pairs or not. Since the pinouts are different for cat5 vs > T1 cables, I'd have to guess a single strand is used from two different > twisted pair groups. That wouldn't be cool, but in short runs it > probably doesn't have much of an impact. >
IIRC, standard Ethernet uses pairs 1&2 and 3&6. The color scheme on "568B" is 1&2 = white/orange pair, 3&6 = white/green pair Most Ethernet cables then have the white/blue pair on 4&5, and white/brown on 7&8. An RJ45 carrying a T1 is: 1 - RxA 2 - RxB 4 - TxA 5 - TxB Assuming that you'd want RxA and TxA in the same twisted pair (ditto for RxB and TxB) then a cable would look something like this at each end: 1&4 = white/orange pair 2&5 = white/blue pair I don't know if there's an industry standard for T1 cabling to have a certain color pair for A and another for the B pairs. Electrically, though, the color is insignificant - as long as the correct pairs are twisted together then all is well. Does anyone have a "real" T1 cable that they can share with us the pin configuration? I am curious to know what color pairs are used. -MC _______________________________________________ --Bandwidth and Colocation provided by Easynews.com -- Asterisk-Users mailing list To UNSUBSCRIBE or update options visit: http://lists.digium.com/mailman/listinfo/asterisk-users
