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By:	Bruce Bahlmann

A cable modem technology from Terayon Communications developed in 1994 that provides 10 Mbps transmission in both directions. S-CDMA became part of the Data over Cable Service Interface Specification (DOCSIS) 2.0 specification in 2003. S-CDMA works well in noisy environments. It is suited for cable plants that are entirely coax based or that do not have optimum systems.

"The S-CDMA of DOCSIS 2.0 is actually not a true CDMA, but rather a mix of CDM, CDMA, and TDMA. The incoming data is organized in mini-slots, which have two dimensions (spreading codes and time). The time duration of mini-slots is one S-CDMA frame that spans a programmable number of S-CDMA symbol intervals (maximum frame length is 32 S-CDMA symbol intervals). Symbol spreading is performed through multiplication by a spreading code (spreading sequence) of 128 chips taken from a set of 128 orthogonal codes that are generated by a quasi-cyclic shift. Spreading is in the time domain, which means that an S-CDMA symbol interval is equal to 128 TDMA symbol intervals." [Juniper Networks]

"The long duration symbols of S-CDMA provide robustness in the presence of certain types of impulse noise. Long duration symbols lead to a requirement that multiple symbols be simultaneously sent to maintain aggregate bandwidth." [ADC]

3G group seeks more members.(Standards)(Time Division Synchronous Code Division Multiple Access): An article from: 2.5G-3G by Information Gatekeepers, Inc. ($5.95)

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