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Symmetric high-speed digital subscriber line (SHDSL) is a telecommunications technology for Digital Subscriber Line (DSL) subscriber lines. It describes a transmission method for signals on copper pair lines, being mostly used in Access networks to connect subscribers to Telephone exchanges or POP Access Points. Copy of the original phone of Graham Bell at the Musée des Arts et Métiers in Paris Telecommunication is the transmission of signals over a distance for the purpose of communication. ...
By the mid 20th century humans had achieved a level of technological mastery sufficient to leave the surface of the planet for the first time and explore space. ...
A typical DSL Modem DSL or xDSL, is a family of technologies that provide digital data transmission over the wires of a local telephone network. ...
In telecommunications, an access network is a network that connects subscribers to telecommunication service providers over public ground. ...
Subscriber: In a public switched telecommunications network such as the common telephone system, the ultimate user, customer, of a communications service. ...
central office = Exchange building in the U.S. telephone exchange = Exchange building in the UK, and is also the UK name for a telephone switch, and also has a technical meaning in U.S. telecoms telephone switch is the U.S. term, but is in increasing use in technical UK...
A point-of-presence (POP) is an artificial demarcation or interface point between communications entities. ...
G.SHDSL was standardized in February 2001 internationally by ITU-T with recommendation G.991.2 The ITU Telecommunication Standardization Sector (ITU-T) coordinates standards for telecommunications on behalf of the International Telecommunication Union (ITU) and is based in Geneva, Switzerland. ...
It features symmetrical data rates from 192 kbit/s to 2,304 kbit/s of payload in 64 kbit/s increments for one pair and 384 kbit/s to 4,608 kbit/s in 128 kbit/s increments for two pair applications. The reach varies according to the loop rate and noise conditions (more noise or higher rate means decreased reach) and may be up to 3,000 meters. The two pair feature may alternatively be used for increased reach applications by keeping the data rate low (halving the data rate per pair will provide similar speeds to single pair lines while increasing the error/noise tolerance). In telecommunication, data signaling rate (DSR) is the aggregate rate at which data pass a point in the transmission path of a data transmission system. ...
In cargo transport, the payload is the valuable contents of the vehicle. ...
In common use the word noise means unwanted sound or noise pollution. ...
The payload may be either 'clear channel' (unstructured), T1 or E1 (full rate or fractional), n x ISDN Basic Rate Access (BRA), Asynchronous Transfer Mode (ATM) or 'dual bearer' mode (i.e. a mixture of two separate streams (e.g. T1 and 'packet based') sharing the payload bandwidth of the G.shdsl loop). Two Network Interface Units, one with a single card, the other with two In telecommunications, T-carrier is the generic designator for any of several digitally multiplexed telecommunications carrier systems originally developed by Bell Labs and used in North America and Japan. ...
To meet Wikipedias quality standards, this article or section may require cleanup. ...
ISDN is also short for isosorbide dinitrate Integrated Services Digital Network (ISDN) is a type of circuit switched telephone network system, designed to allow digital (as opposed to analog) transmission of voice and data over ordinary telephone copper wires, resulting in better quality and higher speeds, than available with analog...
Bra has several meanings: Short for brassiere, an undergarment. ...
Asynchronous Transfer Mode (ATM) is a cell relay network protocol which encodes data traffic into small fixed-sized (53 byte; 48 bytes of data and 5 bytes of header information) cells instead of variable sized packets (sometimes known as frames) as in packet-switched networks (such as the Internet Protocol...
The latest standardisation efforts (G.shdsl.bis) tend to allow for flexibly changing the amount of bandwidth dedicated to each transport unit to provide 'dynamic rate repartitioning' of bandwidth demands during the uptime of the interface and optionally provides for 'extended data rates' by using a different modulation method (32-TCPAM instead of 16-TCPAM, where TCPAM is Trellis-Coded Pulse Amplitude Modulation). Also a new payload type is introduced: packet based, e.g. to allow for Ethernet-frames to be transported natively (currently, they may only be framed in ATM or T1/E1/...). This article or section does not cite its references or sources. ...
Modulation is the process of varying a carrier signal, typically a sinusoidal signal, in order to use that signal to convey information. ...
Ethernet is a large and diverse family of frame-based computer networking technologies for local area networks (LANs). ...
In Europe a variant of G.SHDSL was standardized by ETSI using the name 'SDSL'. This ETSI variant is not compatible with the ITU-T G.shdsl standardized regional variant for Europe and must not be confused with the usage of the term 'SDSL' in North America. European redirects here. ...
The European Telecommunications Standards Institute (ETSI) is a standardization organization of the telecommunications industry (equipment makers and network operators) in Europe, with worldwide projection. ...
The ITU Telecommunication Standardization Sector (ITU-T) coordinates standards for telecommunications on behalf of the International Telecommunication Union (ITU) and is based in Geneva, Switzerland. ...
Symmetric Digital Subscriber Line (SDSL) is a Digital Subscriber Line (DSL) variant with E1-like data rates (72 to 2320 kbit/s). ...
See also
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