Multiplex communications – Wide area network – Packet switching
Patent
1981-11-09
1984-10-09
Olms, Douglas W.
Multiplex communications
Wide area network
Packet switching
179 2DP, H04J 312
Patent
active
044765592
ABSTRACT:
A transmission system comprises apparatus for the transmission of voice signals only, data signals only, or a combination of both voice and data signals in a multiplexed stream of eight bit time slots over a single, bidirectional digital channel for a point-to-point connection. In the combined mode, the encoded voice signals, using low bit rate voice encoders, are assigned to four bit positions of the eight bit time slot; the data signals are assigned to the remaining four bits. Up to two bit positions normally used for data may be used for signature bits, thereby identifying whether the multiplexed stream comprises voice signals only, data signals only, or a combination of both voice and data signals. Also, a minimum of one "1" bit per eight bit time slot is thereby guaranteed.
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Brolin Stephen J.
Wyndrum, Jr. Ralph W.
AT&T Bell Laboratories
Chin Wellington
Nimtz Robert O.
Olms Douglas W.
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