Hybrid Fiber-Coax Network Powering Issues (1995)

By Tom Osterman, President, Cornm/net Systems Inc. and Brian Bauer, Raychem Corporation

One of the most significant and controversial issues facing HFC network designers today is powering. With the deployment of HFC based networks by Telephony providers, the powering systems are evolving into a much different design than previously used by the CATV industry. Issues such as providing power down the drop cable to the home, network interface device power characteristics and power passing taps are important considerations. Other concerns for these new designs include choice of operating voltage and frequency, corrosion, safety, current limiting, NEC and NESC code compliance as well as the unique requirements ofBroadband telephony. This paper will review the powering issues specific to the distribution area with emphasis on powering requirements for Broadband Telephony on HFC networks.

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