Local loop: Difference between revisions

Revision as of 21:57, 21 August 2012

Revision as of 08:30, 8 October 2012

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In [[telephony]], the '''local loop''' (also referred to as a '''subscriber line''') is the physical link or circuit that connects from the [[demarcation point]] of the [[Customer-premises equipment|customer premises]] to the edge of the [[Common carrier|carrier]] or [[telecommunications service provider]]'s network.

{{unreferenced|date=February 2008}}

In [[telephony]], the '''local loop''' (also referred to as a '''subscriber line''') is the physical link or circuit that connects from the [[demarcation point]] of the [[Customer-premises equipment|customer premises]] to the edge of the [[Common carrier|carrier]] or [[telecommunications service provider]]'s network.

At the edge of the carrier [[access network]] in a traditional PSTN ([[public switched telephone network]]) scenario, the local loop terminates in a circuit switch housed in an [[incumbent local exchange carrier]] [[telephone exchange]].

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Modern implementations may include a [[digital loop carrier]] system segment or [[fiber optic]] transmission system known as [[fiber-in-the-loop]]. The local loop may terminate at a circuit switch owned by a [[competitive local exchange carrier]] and housed in a [[point of presence]] (POP), which typically is either an incumbent local exchange carrier telephone exchange or a "[[carrier hotel]]". A local loop may be provisioned to support data communications applications, or combined voice and data:

* analog[[Analog]] voice[[Voice]] and signaling used in traditional [[Plain old telephone service|POTS]] (POTS)

* [[Integrated Services Digital Network]] (ISDN)

* variants of [[Digital Subscriber Line]] (DSL)

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The term "local loop" is sometimes used for any "[[last mile]]" connection to the customer, regardless of technology or intended purpose. Hence the phrase "[[wireless local loop]]". Local loop connections in this sense include:

*Electric power line local loop: [[Power Line Communications|PLT]] or PLC

*Optical local loop: Fiber Optics services such as [[FiOS]]

*Satellite local loop: [[communications satellite]] and cosmos Internet connections of [[satellite television]] ([[Digital Video Broadcasting|DVB]]-S)

*Cable local loop: [[Cablemodem]]

*[[Wireless local loop]] (WLL): [[LMDS]], [[WiMAX]], [[GPRS]], [[HSDPA]], [[DECT]]