From: Deep Ratan (deep.ratan@gmail.com)
Date: Thu May 12 2005 - 17:11:35 GMT-3
Some LECs have begun to deliver T1 service over two wires instead of
the traditional 4 wires. 1 pair RX is now 1-wire RX and ditto for TX.
Throughput, latency etc is not affected in any way. Send me email,
I"ll try to dig up more info on this for ya....
On 5/11/05, Anthony Pace <anthonypace@fastmail.fm> wrote:
> I recently terminated a T1 and ISDN PRI in a remote location and was
> able to see that the TELCO had terminated the T1 using a single pair and
> the PRI using a single pair from the 25 pair bundle coming into the Data
> Center's smart jacks.
>
> I was always under the impression that from the CSU/DSU (in my case it
> was built into the router) to the smartjack and subsequently the NI card
> in the MPO was 4 wires. 1 pair TX and 1 pair RX.
>
> Maybe between the CSU/DSU and the NI card it's 2 wires and then 4 for
> the distance to the CO? ??? I am confused because I always believed that
> DSL was born out of the efforts of finding a single pair alternative to
> T1 technology.
>
> Should PRI and DS1 be 1 pair or 2?
>
> Anthony Pace CCIE 10349
>
> --
> Anthony Pace
> anthonypace@fastmail.fm
>
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