In the Chicagoland area we refer to the AT&T Techs.that service these circuits as "DOGS",
as they are in the Digital Operations Group.
I've often heard them refer to the single pair T1
as a "high voltage T1", I have no idea why as it's not like the old Western Union Trunks that could knock you on your butt.
I do know that when bundled with DSL it can knock out the DSL. We found that out the hard way when they ran a single pair T1 through the same 25 pair UG that had several DSL lines in it.
This was to a small strip mall.
Had to set up a vendor meet.
Disconnected the T1 at the CO and the 3 DSL lines came back up, tied it down the 3 DSL
all went out again.
Changed the T1 to a 2 pair all was happy.
It was an old time Tech. who suggested this as he had seen it before.
The CLEC, (XO) claims it's cheaper for them to use the single pair where they can, I'm not sure if this is true but I was also told by the AT&T Tech. that they do have to be fairly close to the CO for them to use a single pair.
I thought all this was interesting until it cost me 2 days screwing around on my time.
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MrG
