Pinouts for T1/E1 crossover cable WAS "RE: [Asterisk-Users] what cable to connect a legacy PBX to a TE410P ?"

[Sangoma Techdesk]

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: david.ys1 at hotmail.com
Email: davidy at sangoma.com
Wiki: http://sangoma.editme.com
 



> 
> Date: Mon, 24 Apr 2006 20:19:02 +0800
> From: Leo Ann Boon <leo at datvoiz.com>
> Subject: Re: Pinouts for T1/E1 crossover cable WAS "RE:
> 	[Asterisk-Users] what	cable to connect a legacy PBX 
> to a TE410P ?"
> To: radamson at routers.com, 	Asterisk Users Mailing List -
> 	Non-Commercial Discussion	
> <asterisk-users at lists.digium.com>
> Message-ID: <444CC236.101 at datvoiz.com>
> 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
> 
> 
> 
> 
>