Single-Pair High-Speed Digital Subscriber Line (SHDSL)

SHDSL is the newest member of the DSL family being currently standardized at ITU (G.shdsl) and ETSI (TM6) in 2001. G.shdsl targets the small business market.

Multiple telephone and data channels,video conferencing, remote LAN Access, and leased lines with customer-specific data rates are among its many exciting characteristics.

Spectrally friendly with other xDSLs, it supports symmetric data rates varying from 192 Kbps to 2.321 Mbps across greater distances than other technologies. SHDSL uses a Trellis Coded Pulse Amplitude Modulation (TC PAM)-based modulation scheme, which is different from the other forms ofxDSL.

It will operate over a single pair of wires at ranges from 6,000 feet to 20,000 feet (2.3 Mbps to 192Kbps rates, respectively) on 26 AWG copper. This will produce a 35 to 50 percent improvement in rate at a given range over traditional symmetric DSL and a 15 to 20 percent improvement in distance at a given rate over traditional symmetric DSL. G. shdsl is also known as G.991.2 standard.