6.2. Standards for Multirate SHDSL
ITU-T Recommendation G.991.2 (also referred to as G.shdsl) defines the interface specification for SHDSL transceivers. G.shdsl defines a multirate single-pair symmetric DSL transport using 16-level trellis coded PAM. The main body of Recommendation G.991.2 defines the interworking specification that is independent of any regional requirements. Annex A of G.991.2 defines requirements and objectives that are specific to North America; similarly, Annex B of G.991.2 defines requirements and objectives that are specific to the European community.
Japan does not use TC-PAM for SHDSL. Because the Japan network has an abundance of time compression multiplexed ISDN (TCM-ISDN), the line code chosen for SHDSL applications ...
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