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The American National
Standards Institute (ANSI) Working Group T1E1.4 recently approved an
ADSL standard at rates up to 6.1 Mbps (ANSI Standard T1.414). The
European Technical Standards Institute (ETSI) contributed an annex to
T1.414 to reflect European requirements. T1.414 currently embodies a
single terminal interface at the premises end. Issue II, now under
study by T1E1.4, will expand the standard to include a multiplexed
interface at the premises end, protocols for configuration and network
management, and other improvements.
The ATM Forum and the Digital
Audio-Visual Council (DAVIC) have both recognized ADSL as a
physical-layer transmission protocol for unshielded twisted-pair (UTP)
media.
The ADSL Forum was formed in December
1994 to promote the ADSL concept and facilitate development of ADSL
system architectures, protocols, and interfaces for major ADSL
applications. The Forum has more than 200 members, representing
service providers, equipment manufacturers, and semiconductor
companies throughout the world. At present, the Forum's formal
technical work is divided into the following six areas, each of which
is dealt with in a separate working group within the technical
committee:
- ATM over ADSL (including transport
and end-to-end architecture aspects)
- Packet over ADSL (this working group
recently completed its work)
- CPE/CO configurations and interfaces
- Operations
- Network management
- Testing and interoperability
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