DATA LINK FOR DIGITAL CHANNEL BANK SYSTEMS

摘要

Abstract:A data link is additionally provided in a digitalchannel bank type transmission system without displacingor degrading any present voice or signaling channelcapacities. The additional data channel is obtained by"borrowing" a major portion of the signaling subframechannel. A transmit circuit serves to time divisionmultiplex a data channel into the signaling subframechannel by transmitting the signaling framing pattern inan intermittent periodic manner with preselected data bitsinterposed therebetween. At the remote receiving terminal,a subframe recovery circuit serves to recover the signalingframing pattern embedded in the multiplexed subframechannel. A receive circuit at the remote terminal isresponsive to a signal from the subframe recovery circuitto separate out the data bits in the multiplexed subframechannel.