TACS  Delivers the Insight and Vision on Technology for Strategic Decisions



Home ] Up ] Services of TACS ] Competences of TACS ] Markets of TACS ] About TACS ] Views & News ] Links ] Site Map ] Search ]
[ xDSL ] PLC ] Optical Access Nets ] HFC ]



xDSL (Digital Subscriber Line) Physical Layer Modem Technologies

ADSL frequency plan

ETSI is very active in the definition of physical layer standards for digital subsriber line (DSL) technologies. It all started with the concept of Integrated Services Digital Network (ISDN), and the so-called xDSL family has continued to grow ever since, one success story after the other, with the technologies such as HDSL, ADSL, VDSL and most recently SDSL.

ISDN, HDSL, ADSL, VDSL and SDSL are all DSL modem technologies designed to operate on telephone wires intended originally for voice-band communication (300Hz to 3.4kHz). Advances in DSP technology combined with innovation in algorithms and coding methods have allowed access to previously untapped information capacity. Bandwidth utilisation has increased by two orders of magnitude over the last ten years or so; from under 100kHz for narrow-band ISDN to over 10MHz for VDSL

External Links
  • Digital Subscribe Line-Wikipedia
  • ADSL
    • Carrierless Amplitude Phase (CAP) Modulation
    • Dicsrete Multi Tone (DMT); Orthogonal Frequency Division Multiplexing (OFDM)
  • High Data Rate Digital Subscriber Line (HDSL)
    • HDSL2
  • Very High Speed Digital Subscriber Line (VDSL)
  • Symmetric Digital Subscriber Line (SDSL)
    • Symmetric High Speed Digital Subscriber Line
  • DSL Forum
    • Technical Reports of DSL Forum




Home ] Up ] ISDN ] HDSL ] ADSL ] VDSL ] SDSL ]


Copyright 1997-2015 TACS
Last modified: July 13, 2016


The Best Networks Start with the Best Consultants, TACS