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Originally Posted by bnkrptlsr
T-1 was the {GTE?} brand name for DS1 service.
Newton's 14th defines a DS1 as - Digital Service level 1.
I don't believe that there is any technical difference between a T1 and a DS1.
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Again depending on who you talk to. To most, a DS1 is simply a raw 1.544M data stream before you put any kind of protocol onto it. You then layer either T1 protocol (24*56k after bit robbing) or PRI protocol (23b+d) onto that stream in order to use it for voice.
The other camp argues that (since a DS1 stream with no protocol is useless for voice) it's birthed as a T1 and optionally converted to PRI - therefore they feel free to use the terms T1 and DS1 interchangebly.
Peter