At Sangoma we do quite a lot of back-to back T1 and E1 connections. T1 is not a very fussy connection, as the baud rate is only about 750 kbps. In our experience, for error free communications you can use the following rules of thumb: Up to 50 ft: Flat patch cable Up to 500 ft: Ordinary twisted telephone cable Cat 5 may be overkill unless you are going hundreds of feet.
David Yat Sin Sangoma Technologies (905) 474 1990 x119 (800) 388 2475 x199 MSN: [EMAIL PROTECTED] Email: [EMAIL PROTECTED] Wiki: http://sangoma.editme.com > > Date: Mon, 24 Apr 2006 20:19:02 +0800 > From: Leo Ann Boon <[EMAIL PROTECTED]> > Subject: Re: Pinouts for T1/E1 crossover cable WAS "RE: > [Asterisk-Users] what cable to connect a legacy PBX > to a TE410P ?" > To: [EMAIL PROTECTED], Asterisk Users Mailing List - > Non-Commercial Discussion > <asterisk-users@lists.digium.com> > Message-ID: <[EMAIL PROTECTED]> > Content-Type: text/plain; charset=ISO-8859-1; format=flowed > > Rich Adamson wrote: > > > <snip> > > For short runs, the use of cat5 vs proper T1 cables isn't likely to > > have any impact unless there is a fair amount of induction from > > electrical noise, etc. That can take the form of florescent > fixtures, > > transformers, older CRT monitors, etc, etc. > > > > On longer runs, the shielded T1 cables are likely to provide better > > results particularly if there happens to be any electrical noise. > > > > Oh, and if shielded T1 cable is used, the shield at each end of the > > cable must be grounded. (Let's see how many can figure out > how to do > > that via an rj45 plug. ;) > > Totally agree with you, unshielded cables are only usable if > the distance is short. Just curious, how should one ground > the shield? Do you ground it to the ground bar in the server > room? Any special requirements? > > TIA > > > > > _______________________________________________ --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
