Glossary
157
Glossary
ADSL
short for Asymmetric Digital Subscriber Line
ADSL (G.992.1/G992.2) was developed on the basis of DSL
technology in order to satisfy the increasing demand for high-
er throughput rates during uploading and downloading.
designates a fast kind of data transmission that works with
standard copper cables and transports signals in both direc-
tions at different speeds (upstream at 640 Kbit/s and down-
stream at up to 9 Mbit/s).
ADSL2
short for Asymmetric Digital Subscriber Line 2
ADSL2 (G.992.3) is a further development of the ADSL stan-
dard.
ADSL2 offers range much greater than did the first ADSL gen-
eration, and is significantly more robust than ADSL, as it can
simply disable single carrier frequencies when they produce
interference. This feature allows ADSL2 to prevent synchroni-
zation losses.
With a throughput rate of up to 12 Mbit/s downstream,
ADSL2 offers considerably greater bandwidth than ADSL.
ADSL2 is completely downward compatible, meaning that ter-
minal equipment compliant with ADSL can also be operated
on ADSL2 lines, although they cannot exploit the advantages
of ADSL2.
In practice ADSL2 has become less important since the
ADSL2+ standard has made higher throughput rates possible.
ADSL2+
short for Asymmetric Digital Subscriber Line 2 with extended
bandwidth
ADSL2+ (G.992.5) is a further development of the ADSL stan-
dard.
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