T1 short-haul vs. long-haul

Wed Jul 21 14:36:59 UTC 2004

Robert Boyle wrote:
> 
> You can travel up to 655 ft. with a T1 cable from the NTU which the 
> phone company will drop at your site. According to the letter of the 
> specs, you are supposed to use "T1 cable" two 22AWG pairs individually 
> shielded to prevent cross-talk. In practice, we have extended DMarcs up 
> to 200-300 feet with regular Cat 3/4/5/6 cable and have never had any 
> problems or out of spec. cross-talk as a result.

Kentrox used to have a white paper regarding demarcation extensions. 
They indicated that regular Cat 3/5 cable could likely be used to 
1000-2000 feet, and individually-shielded twisted pair cable could go 
6000 feet.  As noted above, crosstalk is normally the critical factor in 
the distance "game".

pt