One of the simplest ways to make a T-1 (E-1) crossover is to take a dual RJ-45 biscuit and do the crossover inside it. Label it as a crossover with a Sharpie. Then you can use two normal cables. I always had at least one of these in my kit when I was doing field work.
THX/BDH On Sat, 2003-11-22 at 19:45, Scott Stingel wrote: > Yes, that's true how the pairs are formed, and its also true that a (short) > ethernet cable can normally be used as a straight through E1/T1 cable, since > all wires are connected. > > We need an E1 crossover cable for the tests we're running, and so we have to > make one, because an ethernet crossover cable will not work. > > For anyone trying to make an E1/T1 crossover, here's a nice diagram from NMS > that may help. The only pins that are needed in a short cable for testing > are 1,2,4,5. > > Click on: > http://www.nmscommunications.com/NMS/nms_technotes.nsf/0/91d49c8785b2aab0852 > 566fa0050740a?OpenDocument > > Cheers > Scott > > Scott M. Stingel > Emerging Voice Technology Inc. > > Email: [EMAIL PROTECTED] <mailto:[EMAIL PROTECTED]> > URL: www.evtmedia.com <http://www.evtmedia.com> > > > > > -----Original Message----- > > From: [EMAIL PROTECTED] > > [mailto:[EMAIL PROTECTED] On Behalf Of > > Brian D Heaton > > Sent: Saturday, November 22, 2003 10:04 PM > > To: [EMAIL PROTECTED] > > Subject: RE: [Asterisk-Users] TE410P Errors under load > > > > > > A 568B Ethernet cable will be paired as follows: > > > > 1 ORG-WHT > > 2 ORG > > 3 BLU > > 4 GRN-WHT > > 5 GRN > > 6 BLU-WHT > > 7 BRN-WHT > > 8 BRN > > > > As you can see you still maintain twisted pair integrity for T1 > > applications (1-2, 4-5), as well as Ethernet (1-2, 3-6). The primary > > issue would be shielding as most Ethernet cables aren't shielded. > > > > THX/BDH > > > > > > > > On Sat, 2003-11-22 at 13:43, Ray Burkholder wrote: > > > Might you be getting problems because you are using an > > Ethernet cable? If > > > my memory serves correctly, an Ethernet cable is paired > > differently than an > > > E1/T1 cable. > > > > > > _______________________________________________ > > Asterisk-Users mailing list > > [EMAIL PROTECTED] > > http://lists.digium.com/mailman/listinfo/asterisk-users > > > > > > _______________________________________________ > Asterisk-Users mailing list > [EMAIL PROTECTED] > http://lists.digium.com/mailman/listinfo/asterisk-users > _______________________________________________ Asterisk-Users mailing list [EMAIL PROTECTED] http://lists.digium.com/mailman/listinfo/asterisk-users