2-wire T1?

schwefeLjm · 2005-03-03T17:01:24+00:00

I moved my smartjacks lastnight and found that the T1 is only 2 wires.(It is from an McLeodUSA.) I have NEVER seen a T1 that was not 4 wiresand still was a T1. The line is indeed 1.544 mbit.The only telco data service, at those speeds, that I am aware of thatruns on 2 wires is xDSL. Is this HDSL or some other flavor?If it is DSL I will be p$#$#d. I am not paying T1 prices for a DSLline, thank you very much.Any help would be greatly appreciated.Jason

Mar 03, 2005 44 Replies

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Robert Bonomi 21 years ago

Technically, that is not a T-1. It may be a T-1 equivalent. :)

[[.. munch ..]]

Note: I did *not* say "because they use a 2-wire feed, they're a bottom feeder". I'll make it clearer: "because they *are* a bottom-feeder, they might be using any kind of set-up -- standard *or* sub-standard." I would not be surprised to find that in some cases they were using ADSL for a 'sold as "T-1 equivalent" line'. Not saying that they *always* do that, nor even that they _do_ do it, at all. Just that it would not surprise me to find out that they were so doing.

McLeod sells to customers where price is the over-riding consideration. They can sell cheap, because they bought/built cheap. The vast majority of their infrastructure was acquired at 'cents on the dollar' liquidations of dot-com bubble casualties .

Among other things, this means that there is a hodge-podge of equipment and systems deployed, It is _very_ difficult to predict just "what" they might be using in any given installation.

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NoSpam 21 years ago

IIRC, T-1 run on twisted pair copper (like ABAM cable, for example) electrically balanced between the two wires ? It was intended to originally ride the existing cable pairs with T-1 repeaters installed in place of the loading coils used on analog ckts.

I'm not aware of any T-1 on coax, although one flavor of European E-1 (T-1's foreign cousin at 2.048 Mbps) is unbalanced on coax .... there's also E-1 on balanced twisted pair, with balun tranformers available to interwork between the 2 kinds of E-1 if necessary in the lab, C.O., etc.

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David Lesher 21 years ago

Give the man a gold star. Although there were likely a xxxxload of cable plant engineering requirements to meet, and they soon started deploying err T-path I think it was called; cable with 2 separate shields so as to isolate the transmit & receive pairs from each other. [There was no fancy-smancy echo cancelling in 1962 technology T's]

Nor I...

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Watson A.Name - "Watt Sun, th 21 years ago

Perhaps a bit OT but UUNet is a part of Worldcom AKA MCI, notorious for their lack of concern for their customer's problems. Like many other huge comglomerates, they can get away with it because they're so big.

I'm overjoyed to see that their _now_convicted_ crook CEO Ebbers will see nothing but gray bars for the rest of his life. He deserves worse. Much worse.

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