What is SHDSL?

SHDSL, also known as G.shdsl, stands for Single-Paired High-Bit-Rate Digital Subscriber Loop and is defined by the ITU Global Standard G991.2 from February 2001. It delivers voice and data services based on highly innovative communication technologies and will thus be able to replace older communication technologies such as T1, E1, HDSL, HDSL2, SDSL, ISDN and IDSL. SHDSL is designed to transport symmetrical data across a single copper pair at data rates from 192 kb/s to 2.312 Mb/s. This covers applications traditionally served by Fractional T1 through E1 services

What is G.Shdsl.bis?

Major updates to G.991.2 were released in December 2003. The updated G.991.2(2004) features:

  • Optional support for up to four copper pair connections
  • Optional extensions to allow user data rates up to 5.696 Mb/s, described in Appendix F.
  • Optional support for Dynamic Rate Repartitioning, allowing flexible change of the SHDSL data rate without service interruption, described in Appendix E.10.3.
  • New payload definitions including Ethernet Packet Transfer Mode (PTM), described in Appendix E.11

 Features of SHDSL

SHDSL, as defined in ITU G991.2, provides high symmetric data rates with guaranteed bandwidth and low interference with other services. By supporting equal upstream and downstream data rates, G.SHDSL better fits the needs of:

  • Remote LAN access
  • Web-hosting
  • Application sharing
  • Video-conferencing
  • Variable data-transmission rate
  • Spectral compatibility with all other services
  • Noise tolerance and bridged taps
  • Time-critical delivery
  • High data rates
  • Extended range
  • Support for multiple transport technologies