VDSL2 Manual
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VDSL2 Point to Point Solution
VDSL2
(Very-High-Bit-Rate Digital Subscriber Line 2, ITU-T G.993.2 Standard) is an
access technology that exploits the existing infrastructure of copper wires that were
originally deployed for POTS services. It can be deployed from central offices, from
fibre-fed cabinets located near the customer premises, or within buildings.
ITU-T G.993.2 VDSL2 is the newest and most advanced standard of DSL broadband
wireline communications. Designed to support the wide deployment of Triple Play
services such as voice, video, data, high definition television (HDTV) and interactive
gaming, VDSL2 enables operators and carriers to gradually, flexibly, and cost efficiently
upgrade existing xDSL-infrastructure.
ITU-T G.993.2 (VDSL2) is an enhancement to G.993.1 VDSL that permits the
transmission of asymmetric and symmetric (Full-Duplex) aggregate data rates up to 200
Mbit/s on twisted pairs using a bandwidth up to 30 MHz.
VDSL2 deteriorates quickly from a theoretical maximum of 250 Mbit/s at 'source' to 100
Mbit/s at 0.5 km and 50 Mbit/s at 1 km, but degrades at a much slower rate from there,
and still outperforms VDSL. Starting from 1,6 km its performance is equal to ADSL2+.
ADSL-like long reach (LR) performance: ADSL-like long reach performance is one of the
key advantages of VDSL2. LR-VDSL2 enabled systems are capable of supporting
speeds of around 1-4 Mbit/s (downstream) over distances of 4 to 5 km, gradually
increasing the bit rate up to symmetric 100Mbit/s as loop-length shortens. This means
that VDSL2-based systems, unlike VDSL1 systems, are not limited to short loops or
MTU/MDUs only, but can also be used for medium range applications.
