S-HDSL

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Although there are still major regulatory and co-location issues to be resolved, S-HDSL (symmetrical high-bitrate digital subscriber line) eliminates many of the serious technical deployment constraints associated with ADSL (asymmetrical digital subscriber line).
Those that do not may find themselves frozen out of the early market for S-HDSL.
VoDSL service will be launched using SDSL, and emerging standards such as S-HDSL and HDSL2 are expected to greatly improve performance and to accelerate market growth.
The modems rely on S-HDSL (Single-pair High-bit-rate Digital Subscriber Line) technology to deliver high speed data services over existing single copper telephone wires, and deliver fiber optic quality at full-duplex speeds of 768 kbps.