About SHDSL
SHDSL represents the best of several symmetric DSL technologies that have been combined into a single industry standard providing rate adaptation, greater reach, spectral compatibility, low power, and application flexibility.

SHDSL (Symmetric High-Speed Digital Subscriber Line) is emerging as the access technology of choice for high-speed symmetric service offerings by the service providers for businesses and Small Office Home Office (SOHO) customers.

SHDSL stands for Symmetric High-Bitrate Digital Subscriber Loop. SHDSL is the first standardized multi-rate symmetric DSL and is a product of the International Telecommunications Union - Telecommunications (ITU-T). SHDSL is designed to transport rate-adaptive symmetrical data across a single copper pair at data rates from 192 kbps to 2.3 Mbps or 384 kbps to 4.6 Mbps over two pairs. This covers applications traditionally served by HDSL, SDSL, T1, E1, and services beyond E1. SHDSL adheres to the following recommendations: ITU G.991.2 G.SHDSL, ETSI TS 101-524 SDSL and the ANSI T1E1.4/2001-174 G.SHDSL.

With single-pair operation, SHDSL offers 192 kbps to 2.3 Mbps. Data rates are defined in increments of 8 kbps. With dual-pair operation (4-wire mode), SHDSL offers 384 kbps to 4.6 Mbps. Data rates are defined in increments of 16kbps. The line rate on both pairs must be the same