DSL (Digital Subscriber Line) makes use of the unused frequency spectrum of the twisted pair telephone cables by carrying a digital signal without interfering with the voice service.

ETSI is very active in the definition of physical layer standards for DSL technologies including DSL 'splitters' required to separate voice and data. The work originated with the concept of Integrated Services Digital Network (ISDN), and the so-called xDSL family has continued to grow ever since.

TC ATTM Working Group TM 6 is responsible for digital access transmission systems particularly for digital subscriber line systems (DSL) on balanced wired (twisted pair) Infrastructures and will produce within their scope:

  • Specification of functional and physical characteristics of signals and interfaces on the physical line and at the network and the user side
  • Frequency and spectrum management of bands allocated to these systems
  • Specification of DSL filters and splitters
  • Compatibility and co-existence studies between POTS/ PSTN and other technologies, particularly those sharing the same infrastructure
  • Specification of common DSL testing methodology

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