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

[Steve Underwood]

Kevin P. Fleming wrote:

>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 :-(
>  
>
Those paper insulated cables are still the best. The ones laid in the 
1930s are still like new.

Steve