Digital Subscriber Line

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digital subscriber line

[¦dij·əd·əl səb′skrīb·ər ‚līn]
A system that provides subscribers with continuous, uninterrupted connections to the Internet over existing telephone lines, offering a choice of speeds ranging from 32 kilobits per second to more than 50 megabits per second. Abbreviated DSL.

Digital Subscriber Line

(communications, protocol)
(DSL, or Digital Subscriber Loop, xDSL - see below) A family of digital telecommunications protocols designed to allow high speed data communication over the existing copper telephone lines between end-users and telephone companies.

When two conventional modems are connected through the telephone system (PSTN), it treats the communication the same as voice conversations. This has the advantage that there is no investment required from the telephone company (telco) but the disadvantage is that the bandwidth available for the communication is the same as that available for voice conversations, usually 64 kb/s (DS0) at most. The twisted-pair copper cables into individual homes or offices can usually carry significantly more than 64 kb/s but the telco needs to handle the signal as digital rather than analog.

There are many implementation of the basic scheme, differing in the communication protocol used and providing varying service levels. The throughput of the communication can be anything from about 128 kb/s to over 8 Mb/s, the communication can be either symmetric or asymmetric (i.e. the available bandwidth may or may not be the same upstream and downstream). Equipment prices and service fees also vary considerably.

The first technology based on DSL was ISDN, although ISDN is not often recognised as such nowadays. Since then a large number of other protocols have been developed, collectively referred to as xDSL, including HDSL, SDSL, ADSL, and VDSL. As yet none of these have reached very wide deployment but wider deployment is expected for 1998-1999.

2Wire DSL provider lookup.

["Data Cooks, But Will Vendors Get Burned?", "Supercomm Spotlight On ADSL" & "Lucent Sells Paradine", Wilson & Carol, Inter@ctive Week Vol. 3 #13, p1 & 6, June 24 1996].
References in periodicals archive ?
En la Tabla 2 se pueden apreciar los resultados obtenidos para un ancho de banda en el enlace WAN de 64Kbps. La razon de las diferencias radica en la manera como el D-ITG empieza a colocar los datos en el enlace: no se tiene certeza del momento que empieza y termina la medicion de los parametros, ya que cuando se trabaja con el D-ITG, al terminar el tiempo de envio de datos configurado, pasan alrededor de 5 a 9 segundos para que cierre el flujo y cese el envio de informacion.
For example the throughput of G.711 traffic is increased from 64kbps to 70kbps.
Como comentabamos en ediciones anteriores, solo necesitamos 64Kbps por linea de telefono para ofrecer VoIP, 21Mbps para television de alta definicion o HDTV y unos restantes 8Mbps para Internet de alta velocidad; todo sobre la misma linea de fibra optica.
By enabling 128 VLAN and 64kbps policing without requiring expensive and time-consuming new fiber builds, the new product accelerates the migration from circuit to packet-based services by bonding existing T1s or over DS3 into a single virtual transport pipe.
MP3s can be encoded at a variety of compressed bit-rates, from FM radio quality 64kbps right through to 320kbps, which is impossible to tell from uncompressed (but takes up more space obviously).
In addition, Release 1.6 features: fast performance over WAN and slow-speed, low-latency modem lines (64kbps); support for USB virtual media emulation; integration to analog KVM switches; automatic discovery of devices; and integration to 3rd party trouble ticketing, the company claims.
More specifically, ILECs must provide access to a voice grade channel via TDM technology or, if no TDM is available, make a 64kbps channel available.
* Capacidad: Disco Duro de 15 o 20 Gigabytes, 7490 o 9925 canciones en WMA a 64kbps.
This element is used to monitor in-service T/1E/1 circuits, including 64Kbps channels within these connections performing routine tests for errors, signal characteristics and timing.
Nowadays, its satellite network provides links for phone, fax and data communications with speeds of 64Kbps to 270,000 active terminals (ships, road vehicles, aircraft and other mobile terminals).
Midband consists of two 64Kbps connections bundled together to create a 128Kbps channel - more than twice as fast as a standard modem running on conventional wiring.
ISDN, on the other hand, is a digital technology and it is possible to send data at 64kbps. It may not sound a lot faster, but because it is digital it's more efficient.