David Lesher wrote: >Speaking on Deep Background, the Press Secretary whispered: > > >>Zim: >> >>T1 is wired as an "RJ45" 8 pin jack, with the designation of RJ48C. pins 1,2 >>RX pins 4,5 TX. Pin 1 is Ring RX, Pin 2 is Tip RX, Pin 4 is Ring (R1) TX, >>pin 5 is Tip (T1) TX. A straight thru patch cable is required, so that the >>pinouts do not reverse in the cable. This is known as a x-over cable in the >>network world. An 8-pin silver satin cable would have the tab of the plug >>on >>the seam side of one end, with the tab of the other plug on the smooth side >>of >>the silver satin. >> >> > > >Data cables, aka CAT5, are straight through. Cross-over data >cables swap PAIRS 2 & 3. > >Phone cables are crossed over wire-by-wire. Big difference. > > > > Thanks Dave, I can quit typing ;-)
I would not use a silver satin "flat" cable on anything running over 3kHz or 10 feet! Any comm/data cable needs to be TWISTED pair unless you really like hum and noise. We're stuck with the flipped rj11/14 forever because ATT didn't have anyone that could learn how to crimp plugs unless the cable was flat and had a rib that points to the clip ;-) Also, a warning on Smart Jacks. I had much faith in the diagnostic ability of Smart Jacks. But after 15 years, I finally had a S/J that was all GREEN, but the CPE would not pass data. The site took a nearby lightning hit and the card and the CPE would green up, the CO could loop back the SJ and all was fine. But running a bert showed the SJ blowing hits like crazy. Turns out the SJ tx to CPE driver was smoked, the SJ can't test that final leg. I now keep a loopback plug on my keychain, easier than dragging in the bert. -- larry / dallas _________________________________________________________________ KX-T Mailing list --- http://kxthelp.com/ Subscription changes: http://kxthelp.com/mailman/listinfo/kxt
