Method and apparatus for reducing the turn-around time in...

Details Method and apparatus for reducing the turn-around time in... Method and apparatus for reducing the turn-around time in...

H - Electricity

04

N

350/9

H04N 1/36 (2006.01) H04N 1/327 (2006.01)

Patent

CA 2034159

Abstract Previously recommended methods of transmitting facsimile data on the telephone network resulted in periods of time when there is no signal present in the network; one consequence of this was that the retraining time required for the facsimile modem's receiver after each quiet period was undesirably long. This problem is solved by the high-speed transmitter sending two or more holding tones whenever it is not sending training or facsimile signals; these tones prevent re-routing of a telephone connection and allow the high-speed receiver to continue to track data clock and carrier frequencies, thereby considerably reducing the time required for retraining.

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