SHDSL (Synchronous High-Bit digital subscribers Line also known as G.991.2) is a DSL technology that sends and receives high-speed symmetrical data streams at rates between 192Kbps and 2.31Mbps.
SHDSL was developed to incorporate the features of other DSL technologies, such as ADSL and SDSL.
SHDSL is more useful in situations where a fast upstream speed is required. The term Synchronous in the title refers to the fact that upstream and downstream data rates are the same. SHDSL is therefore more suited to voice and data applications that need high upstream and downstream bit-rates and is well matched to applications such as VoIP and Videoconferencing. SHDSL technology also uses the available bandwidth much more efficiently than standard ADSL.
Unlike ADSL, SHDSL technology can achieve higher rates at longer distances. This enables users outside the range of ADSL to be offered DSL service where in the past service could not be provided. SHDSL works over a single pair of copper wires and has excellent reach.. 2.304 Mbps can be achieved up to 13,000 feet from he exchange, and 384 kbps can be maintained at up to a 4 mile radius of the exchange.
