From: Scott Morris (swm@emanon.com)
Date: Wed May 11 2005 - 19:30:40 GMT-3
A T-1 is 2-pair or 4 wires.
However, many of the smartjacks are now HDSL capable (or VDSL depending on
proximity to CO) and that is delivered over a single pair or two wires.
The smartjack is doing magical conversion between the two. ;)
HTH,
Scott
-----Original Message-----
From: nobody@groupstudy.com [mailto:nobody@groupstudy.com] On Behalf Of
Hogo, Trust
Sent: Wednesday, May 11, 2005 6:05 PM
To: Anthony Pace; Group Study
Subject: RE: T1 delievered on 2 wires or 4???
Hope this might help.
http://www.cisco.com/warp/public/788/products/vwicmf_t1.html
http://www.cisco.com/warp/public/63/wic-1dsu-t1.html
------
HQ
-----Original Message-----
From: nobody@groupstudy.com [mailto:nobody@groupstudy.com] On Behalf Of
Anthony Pace
Sent: Wednesday, May 11, 2005 4:50 PM
To: Group Study
Subject: T1 delievered on 2 wires or 4???
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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