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Abstract

A two-way communication system (TWACS) used with an electrical power distribution network N. The TWACS provides both outbound and inbound messages to and from remote network locations. A method of detecting and decoding unsolicited inbound messages from remote locations first involves generating the message in response to a time independent event occurring at the remote location. Formation of the message includes both generating a series of message bits, each of which has a prescribed format, and affixing a preamble to the front end of the message which comprises a plurality of bits arranged in a predetermined pattern. The message is then transmitted over any one of a plurality of communication channels n normal used for two-way communications. Since the event triggering the unsolicited inbound message is independent of time, the time of transmission is random. The message is received at a receiving site, receipt of the message including receipt of the bits comprising the prefix together with bits comprising the message. The bits forming the preamble are detected, their detection signalling the fact an unsolicited message is being received. Preamble bit detection also initiate synchronization of operation of the TWACS to decode the contents of the message.

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First Claim