Alcatel-Lucent has introduced a new technology option into its range of

Alcatel-Lucent has introduced a new technology option into its range
of IP-DSLAM products that it claims has the potential to boost
bandwidth by 30 percent, and improve performance on problem lines that
are unable to support demanding services like IPTV.

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According to the company's web site, the technology, known as Smart
DSL, is a unique solution that allows operators to stabilise DSL lines
that are not operating at optimum performance, without compromising
their usable bandwidth. The traditional means of getting a problem DSL
line to function correctly has been to increase signal-to-noise ratio,
but this reduces bandwidth significantly.

Alcatel-Lucent Smart DSL consists of new features in the ISAM DSL
Access Manager family (Alcatel-Lucent's DSLAM) combined with support
for these features in the line testing and quality management system.
According to the company, "combined these technologies can be used to
troubleshoot and remedy problem lines (eg after a customer complaint),
or to pro-actively optimise line performance." Alcatel-Lucent claims
that this optimisation can increase throughput by as much as 30
percent.

The main cause of line instability in DSL lines is crosstalk from
other lines. According to Alcatel-Lucent, in a typical operator
network, up to 25 percent of lines are potentially unstable because of
crosstalk, which limits a carrier's ability to deliver high revenue
earning premium services such as IPTV.

Alcatel-Lucent says it has developed a technology known as Artificial
Noise and Virtual Noise (ANVN). Virtual Noise is an optional part of
the VDSL2 standard so ANVN works with any VDSL2 standard-compliant CPE
that supports VN, and Artificial Noise will work with every existing
ADSL modem or any flavour, according to the company. Alcatel-Lucent
has a very significant share of the global DSLAM market, which means
this technology should have a large deployment potential.

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