 ISDN
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ADSL
SHDSL
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SHDSL - is the newest standard for symmetric DSL. It works over 2-wires and improves both the distances achievable by DSL and the spectral compatibility with other services often present in a twisted pair bundle. The ITU standard for G.SHDSL is G.911.2. Annex A describs the transmission and performance requirements for North America and Annex B describes performance and transmission requirements for Europe. SHDSL has been standardized by three different standardization bodies: ANSI(T1E1.4/2001-174) for North America, ETSI(TS101524) for Europe and ITU-T(G.991.2) worldwide.
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