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Originally Posted by fataldata
Just a curious question we've been bouncing around here. My suggestion was that a DS1 is a standard and a T1 is the product from the Phone Co. that fits the DS1 specification.
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The answer to this depends on which way you came up. From my perspective (also the standard Lucent/Avaya perspective btw) DS1 is the actual 1.54Mbs data stream. You then organize that DS1 data stream according to either T1 (24*56k) or PRI (23b+1d) protocols.
In the Nortel Universe, the actual data stream is commonly referred to as the T1, which can optionally be enhanced with PRI protocol.
I find the Lucent version more logical, especially since a single b-channel is also known as a DS0, but hey that's the way I learned it :)
Cephas