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Title: ADSL Lite  
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Subject: 1-Meg Modem
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DSL technologies
ADSL ANSI T1.413 Issue 2
ITU G.992.1 (G.DMT)
ITU G.992.2 (G.Lite)
ADSL2 ITU G.992.3
ITU G.992.3 Annex J
ITU G.992.3 Annex L
ITU G.992.4
ADSL2+ ITU G.992.5
ITU G.992.5 Annex M
HDSL ITU G.991.1
VDSL ITU G.993.1
VDSL2 ITU G.993.2

In telecommunications, ITU G.992.2 (better known as G.Lite) is an ITU standard for ADSL using discrete multitone modulation. G.Lite does not strictly require the use of DSL filters, but like all variants of ADSL generally functions better with splitters.

G.lite is a modulation profile which can be selected on a DSLAM port by an ADSL provider and provides greater resistance to noise and tolerates longer loop lengths (DSLAM to customer distances) for a given bandwidth. Most ADSL modems and DSLAM ports support it, but it is not a typical default configuration. The transmission speed of G.Lite (G.992.2) is 1.5 Mbit/s downstream and 512 kbit/s upstream.[1]

The G.Lite specification was an accelerated ITU-T effort to drive interoperability among vendors and was facilitated by the Universal ADSL Working Group, or UAWG. The G.Lite standardization effort took a total of 11 months from start to finish, setting a new record for ANY standard effort within the ITU-T. The previous record had been the V.90 specification for analog modems, which took 18 months to complete. The UAWG consisted of three sets of members: Promoters, Supporters and Adopters. Intel, Compaq and Microsoft were able to rally the support of all of the US RBOCs and five of the largest international carriers (NTT, British Telecom, France Telecom, Deutch Telecom, and Singapore Telecom), collectively representing the Promoters, to drive the major communications equipment manufacturers (the Supporters) to demonstrate interoperability of products based on the G.Lite specification at SUPERCOMM in June of 1999. Adopters represented the majority of the remaining companies in the communications industry that were committed to supporting the new technology specification.[2]

See also


External links

  • ITU-T Recommendation G.992.2 : Splitterless asymmetric digital subscriber line (ADSL) transceivers

Template:ITU standards

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