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asymmetric digital subscriber line (ADSL) interface
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Physical WAN interface for connecting a Services Router to a digital subscriber
line access multiplexer (DSLAM). An ADSL interface allocates line bandwidth
asymmetrically with downstream (provider-to-customer) data rates of up to
8 Mbps for ADSL, 12 Mbps for ADSL2, and 25 Mbps for ADSL2+,
and upstream (customer-to-provider) rates of up to 800 Kbps for ADSL
and 1 Mbps for ADSL2 and ADSL2+, depending on the implementation.
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ADSL2 interface
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An ADSL interface that supports ITU-T Standards G.992.3 and G.992.4
and allocates downstream (provider-to-customer) data rates of up to 12 Mbps
and upstream (customer-to-provider) rates of up to 1 Mbps.
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ADSL2+ interface
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An ADSL interface that supports ITU-T Standard G.992.5 and allocates
downstream (provider-to-customer) data rates of up to 25 Mbps and upstream
(customer-to-provider) rates of up to 1 Mbps.
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Annex A
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ITU-T Standard G.992.1 that defines how ADSL works over plain old telephone
service (POTS) lines.
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Annex B
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ITU-T Standard G.992.1 that defines how ADSL works over Integrated Services
Digital Network (ISDN) lines.
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ITU-T G.991.2
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International Telecommunication Union standard describing a data transmission
method for symmetric high-speed digital subscriber line (SHDSL) as a means
for data transport in telecommunications access networks. The standard also
describes the functionality required for interoperability of equipment from
various manufacturers.
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ITU-T G.992.1
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International Telecommunication Union standard that requires the downstream
(provider-to-customer) data transmission to consist of full-duplex low-speed
bearer channels and simplex high-speed bearer channels. In the upstream (customer-to-provider)
transmissions, only low-speed bearer channels are provided.
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ITU-T G.994.1
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International Telecommunication Union standard describing the types
of signals, messages, and procedures exchanged between digital subscriber
line (DSL) equipment when the operational modes of equipment need to be automatically
established and selected.
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ITU-T G.997.1
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International Telecommunication Union standard describing the physical
layer management for asymmetric digital subscriber line (ADSL) transmission
systems. The standard specifies the means of communication on a transport
transmission channel defined in the physical layer recommendations. In addition,
the standard describes the content and syntax of network elements for configuration,
fault management, and performance management.
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symmetric high-speed digital subscriber line (G.SHDSL)
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Physical WAN symmetric DSL interface capable of sending and receiving
high-speed symmetrical data streams over a single pair of copper wires at
rates between 192 Kbps and 2.31 Mbps. G.SHDSL incorporates features of other
DSL technologies such as asymmetric DSL and transports T1, E1, ISDN, Asynchronous
Transfer Mode (ATM), and IP signals.
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symmetric high-speed digital subscriber line (SHDSL) transceiver
unit–remote (STU–R)
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Equipment that provides symmetric high-speed digital subscriber line
(SHDSL) connections to remote user terminals such as data terminals or telecommunications
equipment.
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