H - Electricity – 04 – J
Patent
H - Electricity
04
J
363/16
H04J 3/02 (2006.01) H04B 10/08 (2006.01)
Patent
CA 1163735
ABSTRACT Voice and alarm signalling capability between supervisory personnel at monitor and control sites located at separated transceiver facilities of a (repeatered) multichannel communication network is provided by a multichannel multiplexed encode/decode scheme in which voice and/or alarm signals generated at one station ace digitally encoded and formatted so as to be inserted into the data stream. of the normally conveyed data traffic over the active channels of the network. At the receiving terminal site, these inserted signals are removed from. the high data rate digital data stream. and delivered to decoding equipment which reconstructs the original voice and/or alarm signals for delivery to the audio equipment of station operation personnel. The encoded signals are inserted as overhead bits for each active channel, so that a fault on one channel will not prevent the completion of transmission of the intended communication between terminal site personnel. The present invention employs a voice/alarm interface module at each terminal site where network operation personnel monitor and supervise network performance. Each of these modules is coupled to receive and accept signals produced from. a conventional telephone handset, and includes tone signalling circuitry that generates a pair of tones to be used for station address signalling, and analog voice coupling circuits for voice signalling. The analog signals are digitized via a companding A-D converter and formatted for delivery to the transcriver equipment inserted with each channel of the network for transmission. -39- Each module also contains deformatting and D-A conversion circuitry which receives the serial overhead bits from a selected one of the channels and reconstructs the original analog signals for delivery to the audio equipment of the terminal station -40-
376424
Iley Harold
Nixon Thomas J.
Harris Corporation
Pascal & Associates
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