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Weaver:
In this article https://www.britannica.com/technology/modem/DSL-modems should the standard for ADSL not be G.992.1 ? Not G.991.2 as stated ? Or am I missing something? Was the latter earlier? The thing is, it does explicitly mention asymmetrical rates in the article.

burakkucat:
ADSL   is ITU-T G.992.1
ADSL2  is ITU-T G.992.3
ADSL2+ is ITU-T G.992.5
VDSL   is ITU-T G.993.1
VDSL2  is ITU-T G.993.2

  :graduate:

sevenlayermuddle:
Not sure the comparison with T1 is helpful.


--- Quote ---DSL systems carry digital signals over the twisted-pair local loop using methods analogous to those used in the T1 digital carrier system to transmit 1.544 Mbps in one direction through the telephone network.

--- End quote ---

T1 is an entirely different technology, using TDM,  not DMT.  The USP of T1, from my hazy recollection, is the ability to multiplex 24 discreet timeslots (32 for E1), each of which has individual bandwidth as required for a single voice channel, onto a single line.

dee.jay:
I have experience with E1 (European equivalent of T1) for voice, used to operate a Cisco CallManager over an E1 ISDN PRI interface on a Cisco 2600 router.

We had 16 channels, so could make that many external calls at once out to the PSTN, IIRC.

Fun times.

burakkucat:
I have now read that article all the way from the Introduction to the end and my feeling is the author has somewhat "lost his way".  :-\  :-X

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