Multiplex communications – Wide area network – Packet switching
Patent
1989-10-31
1993-06-15
Olms, Douglas W.
Multiplex communications
Wide area network
Packet switching
370 581, 370 582, 370 583, 3701001, H04J 110, H04J 308
Patent
active
052205584
ABSTRACT:
An improved drop/insert multiplexer for use in a channel access unit that uses common channel slots for data channels in first and second directions, and uses less wiring between a multiplexer/de-multiplexer section and a channel section. The drop/insert multiplexer has at the receive side thereof, a time slot phase difference setting stage for providing a predetermined phase difference between received timing signals as well as receive data from the first and second directions; a receive channel pulse generating stage generates multiplexed channels pulses; a receive channel pulse decoding stage and a PCM decoder reproduces a voice signal by receiving selected received data. At the send side thereof, a time slot phase difference correcting stage corrects the set phase difference for sending out channel data to the first and second directions; a send channel pulse generating stage generates multiplexed channel pulses; a send channel pulse decoding stage and a PCM coder produces PCM signals to send out to the first and second directions as channel data.
REFERENCES:
patent: 4434485 (1984-02-01), Huffman et al.
patent: 4468767 (1984-08-01), Warren et al.
patent: 4989199 (1991-01-01), Rzeszewski
Ishikawa Minoru
Nakata Nobuki
Fujitsu Limited
Hom Shick
Olms Douglas W.
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