[72618] in North American Network Operators' Group
Re: T1 short-haul vs. long-haul
daemon@ATHENA.MIT.EDU (Pete Templin)
Wed Jul 21 10:37:39 2004
Date: Wed, 21 Jul 2004 09:36:59 -0500
From: Pete Templin <petelists@templin.org>
To: Andre Oppermann <nanog-list@nrg4u.com>
Cc: nanog@merit.edu
In-Reply-To: <6.1.1.1.2.20040721085723.04be4090@mail.tellurian.com>
Errors-To: owner-nanog-outgoing@merit.edu
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
