H - Electricity – 04 – J
Patent
H - Electricity
04
J
363/13
H04J 3/00 (2006.01) H04J 3/12 (2006.01)
Patent
CA 1149976
Abstract: A data link is additionally provided in a digital channel bank type transmission system without displacing or degrading any present voice or signaling channel capacities. The additional data channel is obtained by "borrowing" a major portion of the signaling subframe channel. A transmit circuit serves to time division multiplex a data channel into the signaling subframe channel by transmitting the signaling framing pattern in an intermittent periodic manner with preselected data bits interposed therebetween. At the remote receiving terminal, a subframe recovery circuit serves to recover the signaling framing pattern embedded in the multiplexed subframe channel. A receive circuit at the remote terminal is responsive to a signal from the subframe recovery circuit to separate out the data bits in the multiplexed subframe channel.
340374
Kirby Eades Gale Baker
Western Electric Company Incorporated
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