Multiplex communications – Wide area network – Packet switching
Patent
1985-04-17
1986-10-14
Olms, Douglas W.
Multiplex communications
Wide area network
Packet switching
370 99, 3701101, H04J 316, H04J 300, H04J 312
Patent
active
046176586
ABSTRACT:
In order to multiplex a plurality of various rate subchannels onto a fixed rate channel, a frame structure is defined consisting of j sets of i-tuples for a total of ij bits per frame, the parameters i and j being mathematically determined as a function of the rate of the subchannels and the rate of the fixed channel. For j-l of the i-tuples, i-l bits are used for information and the last bit is set ONE. In one i-tuple all i bits are set ZERO. Framing is detected by monitoring for a ONE followed by i ZEROes, a pattern which cannot occur elsewhere in the frame regardless of the data. An integral number of information bits from each subchannel are distributed in the (i-l)(j-l) information bit positions. In the disclosed embodiment two 6662/3 bps channels and a 4800 bps channel are multiplexed onto an 8000 bps channel using a frame structure consisting of 24 quintets. In the 92 information bit positions, 72 bits are allocated for the 4800 bps channel and 10 bits each are allocated for the 6662/3 bps channels.
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Bell Communications Research Inc.
Falk James W.
Gurey Stephen M.
Olms Douglas W.
Scutch III Frank M.
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