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International Telecommunication Union
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ITU reaches agreement on new global standard that will increase Internet Access Speed
Geneva — The International
Telecommunication Union today reached agreement on a new global standard for
Single pair High bit-rate Digital Subscriber Line (SHDSL) transceivers, which
will allow network operators to economically and efficiently offer leased-line
services to business customers using existing copper loops. SHDSL enables data,
voice and video to be transmitted over distances never before attainable by
other flavours of symmetric DSL technology.
The approved standard, designated ITU-T Recommendation G.991.2, is effective
immediately.
"This latest Digital Subscriber Line (DSL) standard complements ITU-T’s
series of ADSL (asymmetric DSL) standards in that it provides symmetrical high
bit rate network access, and thus is particularly attractive to business
customers fulfilling their needs to upload and exchange large amounts of
data", said Peter Wery, chairman of ITU-T Study Group 15.
SHDSL enables operators to provide symmetric, high-speed data transmission
over the existing copper pairs without requiring the installation of additional
cable. It is a multi-rate DSL technology that allows data rates from 192 kbit/s
to 2 312 kbit/s and can transport T1 (1 544 kbit/s), E1 (2 048 kbit/s), ISDN,
ATM and IP signals. The framing to support these various types of signals is
negotiated at start-up using the ‘handshaking’ protocol defined in ITU-T
Recommendation G.994.1.
This new standard has strong commonality with regional standards and has been
designed to prevent interference to other DSL systems operating in the same
cable.
A number of enhanced ADSL Recommendations on high-speed network access were
also approved, covering:
- Method for DSL systems to negotiate mutually supported operating modes
(G.994.1)
- Reference architecture for ADSL systems (G.995.1)
- Test methods for ADSL systems (G.996.1)
- Management of ADSL systems (G.997.1)
ITU also approved today the first of a set of standards for Home Phone-line
Networking transceivers, ITU-T Recommendation G.989.1. This will allow
home-networking devices (e.g. computer peripherals) to operate over existing
telephone wiring.
Regarding the future evolution of the family of ITU-T DSL (Digital Subscriber
Line) Recommendations, work is well underway on potential enhancements,
including topics such as even higher bit rates and support of combined voice and
data access, for both, symmetrical and asymmetrical operation.
For further information please contact:
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