The author discusses four customer applications based on digital-cross-connect (DCS) systems. The applications which entail customer control of DCS, are: citywide Centrex with adaptive differential pulse-code modulation, disaster recovery, and network optimization, the use of compressed voice and compressed video networks, and cellular radio.< <ETX xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">></ETX>
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P.J. Zanella (2003) studied this question.