Multiplex communications – Wide area network – Packet switching
Patent
1982-01-07
1986-12-02
Olms, Douglas W.
Multiplex communications
Wide area network
Packet switching
3701101, H04Q 1104
Patent
active
046270477
ABSTRACT:
An improvement is disclosed for telecommunication PCM time division multiplex switching systems of the type having voice access ports, each with a voice path and a signalling path, and having PCM signalling and voice transmit buses to carry information to a switching network. From the network, PCM voice receive buses carry switched voice information to be demultiplexed, converted to analog form and connected to the voice port. A signalling bus carries information from the switching network to registers. The system is improved to enable it to switch data as well as voice information. A data port is provided to accompany each voice port, and the improved system includes means for multiplexing input data at the port and inserting it on the signalling transmit bus once the signalling portion of a call is completed. A receive data bus connects the signalling receive bus to means for demultiplexing data and presenting it to receive data ports. In a system where signalling and voice bits are synchronized on the transmit buses and the bits are switched together at a common location in switching network memory, the voice and data bits are likewise switched together to a common destination.
REFERENCES:
patent: 4146749 (1979-03-01), Pepping et al.
patent: 4322843 (1982-03-01), Beuscher
patent: 4370743 (1983-01-01), Moran
patent: 4381427 (1983-04-01), Cheal et al.
patent: 4408323 (1983-10-01), Montgomery
patent: 4413337 (1983-11-01), Dauphin et al.
Fechalos William A.
Mehta Bakulesh A.
Pitroda Satyan G.
Hamann H. Fredrick
Olms Douglas W.
Patti Carmen B.
Rockwell International Corp.
Rokoff Kenneth I.
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