In
telecommunications
Telecommunication is the transmission of information by various types of technologies over wire, radio, optical, or other electromagnetic systems. It has its origin in the desire of humans for communication over a distance greater than that fe ...
, ITU G.992.2 (better known as G.lite) is an
ITU
The International Telecommunication Union is a specialized agency of the United Nations responsible for many matters related to information and communication technologies. It was established on 17 May 1865 as the International Telegraph Unio ...
standard for
ADSL
Asymmetric digital subscriber line (ADSL) is a type of digital subscriber line (DSL) technology, a data communications technology that enables faster data transmission over copper telephone lines than a conventional voiceband modem can provide. ...
using
discrete multitone modulation
In telecommunications, orthogonal frequency-division multiplexing (OFDM) is a type of digital transmission and a method of encoding digital data on multiple carrier frequencies. OFDM has developed into a popular scheme for wideband digital communi ...
. 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
A digital subscriber line access multiplexer (DSLAM, often pronounced ''DEE-slam'') is a network device, often located in telephone exchanges, that connects multiple customer digital subscriber line (DSL) interfaces to a high-speed digital ...
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.
[ 090327 searchcio-midmarket.techtarget.com]
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, Deutsche Telekom, 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 1999. Adopters represented the majority of the remaining companies in the communications industry that were committed to supporting the new technology specification.
See also
*
List of interface bit rates
References
External links
ITU-T Recommendation G.992.2 : Splitterless asymmetric digital subscriber line (ADSL) transceivers
{{ITU standards
Digital subscriber line
ITU-T recommendations
ITU-T G Series Recommendations
Telecommunications-related introductions in 1999