Performance History In Two-way Cable Plants Utilizing A PSK Communication System (1987)

By Rich Citta, Gary Sgrignoli and Dennis Mutzabaugh, Zenith Electronics Corp

Pay-Per-View video programming has become a new source of revenue for cable operators. To achieve maximum potential, a true, low cost two-way impulse delivery system is needed. Two-way cable systems are the most economical method to supply this need. However, minimal reverse cable plant maintenance results in significant ingress and impulse noise that can hinder two-way data communication. The communication system must be rugged and reliable to work in such an environment. A low cost, coherent PSK system has been developed and field tested. Results indicate that field performance correlates within 1-2 db of white noise tests done in the lab. Also, a safety "margin" of greater than 24 db has been observed in the field.

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