ITU actions push ADSL, HDSL forward
( from Yahoo )
Finally, G.995.1 is an overview of all DSL recommendations within ITU-T. It includes a system reference model. While ITU-T's blessing can't be expected directly to jump-start deployment of ADSL among carriers in North America, a spokesman for Compaq Computer Corp. said that, "at the very least, this assures that one product will have a worldwide market based on global standards."
Meanwhile, supporters of HDSL-2 expect to finish ANSI-specific span-power and operations, administration, maintenance and provisioning specs in December and to bring a nearly completed draft to ITU-T in January. HDSL-2 allows symmetrical T1 (1.5-Mbit/second) services to run over a single copper pair to distances of 12,000 feet.
ADC has tested Level One's first silicon for HDSL-2 and is convinced that products incorporating the standard can be released in the first quarter. Level One also is supplying PairGain Technologies Inc. (Tustin, Calif.) with chip sets for imminent release of HDSL-2 concentrators. At present, multi-pair HDSL is handled under G.991.1, and HDSL-2 is designated G.991.2. Mike Rude, lead editor for the HDSL-2 standard and a technical marketing manager at ADC, cautioned that there might be slightly more work in resolving ANSI and ITU standards for HDSL-2 than had been the case for ADSL.
eet.com:80/story/OEG19981028S0010
Quan Nguyen
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