[Asterisk-Users] Re: Shielding of T1/E1 cables WAS RE: Pinoutsfor T1/E1 crossover

[Bart Fisher]

In these cases, the Transmit and Receive pairs are in different binders. 
Thus electrically isolating by virtue of how the binders are wrapped with 
each other and how the pairs are twisted within the binders.

Bart


----- Original Message ----- 
From: "Kevin P. Fleming" <kpfleming at digium.com>
To: "Asterisk Users Mailing List - Non-Commercial Discussion" 
<asterisk-users at lists.digium.com>
Sent: Monday, April 24, 2006 9:27 AM
Subject: Re: [Asterisk-Users] Re: Shielding of T1/E1 cables WAS RE: 
Pinoutsfor T1/E1 crossover


> Andrew Kohlsmith wrote:
>
>> Insulation (especially such thin insulation) does not prevent crosstalk.
>> Distance, shielding and tighter twists do.
>
> Ever looked at the underground cable in the street outside your
> building? If it's more than 20 years old, it's probably paper-insulated
> gel-filled cable, with an _extremely_ thin amount of insulation between
> the conductors and _zero_ insulation between the pairs. T1s seem to work
> just fine on it, unless it's very old or they try to put more than 6-8
> spans in a single 100-pair bundle :-(
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