Digital Subscriber Line (DSL) & Its Types

A Digital Subscriber Line (DSL) is a type of broadband connection that takes advantage of the existing telephone cables to enable high-speed data transmissions to and from a customer’s premises.

Other broadband platforms include ISDN, Leased Lines, terrestrial broadcast, cable and cable modem, satellite, fibre optic, fixed wireless access (FWA), mobile wireless and powerlines.

Broadband telecommunication enables a wide band of frequencies or channels to transmit information concurrently on a wire, which means more information can be sent in a given amount of time.

Digital Subscriber Line (DSL) is a broadband connection that uses the existing telephone line. DSL provides high-speed data transmissions over the twisted copper wire, the so-called “lastmile” or “local loop”, that connects a customer’s home or office to their local telephone company Central Offices (COs).There are a number of different types of DSL and they are referred to collectively as xDSL.

Symmetric:

1. HDSL High data rate Digital Subscriber Line
2. SDSL Symmetric Digital Subscriber Line
3. SHDSL Symmetric High bit rate Digital Subscriber Line

Asymmetric:

1. ADSL Asymmetric Digital Subscriber Line
2. ADSL lite Asymmetric Digital Subscriber Line Lite
3. ADSL 2 Asymmetric Digital Subscriber Line Two
4. ADSL 2+ Asymmetric Digital Subscriber Line Two Plus
5. ADSL 2++ Asymmetric Digital Subscriber Line Two Plus Plus (or ADSL4)

Symmetric and AsymmetricVDSL Very high bit rate Digital Subscriber Line