symmetric digital subscriber line
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• symmetric digital subscriber line
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Asymmetric digital subscriber line
1 It does this by utilizing frequencies that are not used by a voice
telephone call.ANSI T1.413-1998 Network and Customer Installation
Interfaces – Asymmetric Digital Subscriber Line (ADSL) Metallic
Interface
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Asymmetric digital subscriber line - Overview
1 ADSL differs from the less common symmetric digital subscriber line (SDSL). Bandwidth (computing)|
Bandwidth (and bit rate) is greater toward the customer premises
(known as downstream (networking)|downstream) than the reverse
(known as upstream (networking)|upstream).
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Symmetric digital subscriber line
1 'Symmetric digital subscriber line'
('SDSL') can have two meanings:
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Symmetric digital subscriber line
1 * In the wider sense it is a collection of Internet access technologies based on Digital
subscriber line|DSL that offer symmetric Bandwidth (computing)|bandwidth Upstream
(networking)|upstream and downstream (computer science)|downstream, including
IDSL, HDSL, HDSL2, G.SHDSL, and the SDSL variant below. It is considered the opposite of
asymmetric digital subscriber line (ADSL) technologies where the upstream bandwidth
is lower than the downstream bandwidth.
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Asymmetric Digital Subscriber Line 2 Plus
1 'ITU G.992.5' (also referred to as 'ADSL2+' and 'G.DMT.bis+') is an International
Telecommunication Union standard for asymmetric digital subscriber line (ADSL) broadband Internet access. The standard
has a maximum theoretical download speed of '24 Data rate units|Mbit/s'.
Utilizing ITU_G.992.5_Annex_M upload speeds of 3.3 Data rate units|Mbit/s can
be achieved.
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Asymmetric Digital Subscriber Line 2 Plus - Technical information
1 ADSL2+ extends the capability of basic Asymmetric digital subscriber line|ADSL by
doubling the number of downstream (computer science)|downstream Channel
(communications)|channels. The data rates can be as high as 24Data rate units|Mbit/s downstream and up to 1.4Mbit/s upstream depending on the distance from the digital subscriber line access multiplexer|DSLAM
to the customer's premises.
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