DSL gets a high-speed makeover

In a move that is destined to bring higher speed to the home highway, Texas Instruments is to build communications devices based on a new high-bandwidth DSL specification.

In a move that is destined to bring higher speed to the home highway, Texas Instruments is to build communications devices based on a new high-bandwidth DSL specification that it has developed.

The superfast Uni-DSL (UDSL), as it is called, raises the bandwidth of DSL to the level necessary to deliver High Definition Television (HDTV) and other advanced video services to the home using limited fibre deployment.

The UDSL approach and technology will support ultra-high speed rates of 200 Mbit/sec aggregate throughput for one line of DSL, which can be used to provide 100 Mbit/sec symmetric or an asymmetric service, such as 150 Mbit/sec downstream-50 Mbit/sec upstream in shorter loops.

Additionally, since UDSL is also backwards compatible with all DMT standards, (ADSL, ADSL2, ADSL2+ and VDSL, as well as the upcoming VDSL2 standard) operators will be able to support multiple DSL service options using one solution.

UDSL-based equipment will be targeted at neighbourhood service cabinets, sometimes called cross connects or primary connection points. Operators can deploy fibre to this connection point and then use existing copper to deliver speeds between 50-100 Mbit/sec to users. This eliminates the need to deploy fibre to the home or the curb and still enables operators to deliver the speeds required to provide multiple high definition video streams to consumers.

UDSL can also be used in multi-dwelling units (MDUs) and multi-tenant units (MTUs) in shorter loop markets where operators have already deployed fibre to the curb (FFTC) or building (FTTB) networks.

TI expects to introduce devices based on the UDSL standard next year, and UDSL-based equipment is expected to begin rolling-out in 2006.

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