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

[Rich Adamson]

Leo Ann Boon wrote:
> 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?

That would be one way to do it, at both ends.

Personally, I would not try to install an rj45 on each end of a shielded 
T1 cable, but rather terminate the cable on a patch panel.