Multiplex communications – Wide area network – Packet switching
Patent
1990-12-27
1992-09-01
Olms, Douglas W.
Multiplex communications
Wide area network
Packet switching
370112, H04J 312
Patent
active
051446251
ABSTRACT:
A method and system for interfacing a transmission facility with a digital subscriber line to enable transmission of digital voice communication and associated digital signalling are provided. A digital signal from the digital subscriber line is demultiplexed into a digital communication signal and a digital input control signal having a first sequence providing standard framing pattern, a second sequence providing signalling identification, and a third sequence providing signalling information. A monitor monitors the sequence of the input control signal and produces a signalling identification detect signal when the second sequence is detected and signalling enablement output when the third sequence is detected. The communication signal from the digital subscriber line is selectively multiplexed with the signalling information from the input control signal. The signalling information is output to the transmission facility when the signalling-enablement output is produced by the monitor. A digital transmission signal from the transmission facility is demultiplexed into a communication signal and signalling signal. A generator generates a digital output signal in a first sequence to provide standard framing pattern, in a second sequence to provide signalling identification whenever the signalling identification detect signal is produced, and in a third sequence to include the signalling information from the transmission facility when the signalling-enablement output is produced. The communication signal from the transmission facility is multiplexed with the digital output signal from the generator into a digital signal for output onto the digital subscriber line.
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Cain Roger W.
McMahan Dennis B.
Adtran
Kizou H.
Olms Douglas W.
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