Naked DSL

Unbundled DSL ( DSL, pure, pure DSL, naked DSL, English:. Naked DSL, standalone DSL) refers to a DSL broadband access, which is offered unbundled from traditional landline.

Technology neutral and general one also speaks of a pure data connection or unbundled broadband access. This cable Internet can then, for example, bound to it without cable television subscription conceptual covered as well as a pure mobile -based Internet access with no associated cellular voice plan.

Technical distinction of conventional consumer DSL

The directed at private customers DSL variants were originally marketed by the fixed network service providers under the premise, to complement the traditional landline. The frequency spectrum of the telephone line is disconnected by this splitter into two areas; the fixed network uses unchanged the lower frequency range of the cable, while the modulated digital data transmission takes only the formerly unused upper frequency ranges to complete.

For unbundled DSL, cable division is omitted by splinters and the lower frequency range is either co-used for DSL, such as in the traditionally primarily marketed to corporate customers xDSL variants in which the entire frequency spectrum of the twisted pair copper wire shall be used ( SDSL ), or simply lying idle when the usual retail ADSL technology is used, as is common today in most marketed to retail customers unbundled DSL offerings. An exception was in Germany for several years already addressed to private customers SDSL -based Q-DSL -home - product rail of the provider QSC dar.

Market relevance

Geared to consumers unbundled DSL in the form of ADSL - based access has been available since 2006 on the German market on the basis of fully unbundled local loop (for example in the form of the product of HanseNet Alice Light ).

The regulated standalone bitstream access, unbundled DSL connection of the incumbent network operator as an input for competing telephone companies and Internet service providers represents the German Telekom must make available since summer 2008.

Data connection as a basis for the fixed-line substitution

Unbundled DSL or generally unbundled broadband connections are all the more interesting, because more and more participants agree to waive traditional fixed- line telephony and instead mobile or without conventional fixed- switching technology viable and therefore more cost-effective IP telephony (Voice over IP, VoIP) use.

This migration process is also part of the traditional fixed-network providers increasingly (eg HanseNet, Arcor ); in which based on the data terminals to do with IP telephony is referred to as NGN terminals.

Limitations

Telephony is usually implemented at data terminals using SIP, which the customary realized via the traditional circuit-switched telephone network, data services limited are available here. How about missing SIP emulated ISDN lines which are based on all-digital signal transmission services and features such as data channel, ISDN video telephony, Datex -P and G4 ISDN fax with 64 kB / s Fax data services based on analog fax modem transmission are limited depending on the media gateway and inserted codec. Telephony is no longer possible for a subscriber-side power failure or loss of synchronization.