Multiplex communications – Wide area network – Packet switching
Patent
1994-04-26
1995-09-19
Olms, Douglas W.
Multiplex communications
Wide area network
Packet switching
370 60, 370 941, 3701101, H04J 316
Patent
active
054523010
ABSTRACT:
A data transmission and control system using local, externally generated D, Q, M bits in X.25 packets, and including a controller, a controlled device and a transceiver module at each of a plurality of locations. The controller at each location generates and delivers user controlled D, Q and M bits on separate lines and other data on an input/output data bus to the transceiver. The transceiver receives the Q, D, M bits and other data and assembles the data bits with other standard organizational bits to form X.25 information packets according to X.25 protocol. An ISDN interface then inserts the X.25 information packets in standard 48 bit frames for transmission over the ISDN network. The D, Q, M bits and other data are then received at a remote location where the process is reversed, the transceiver receiving the X.25 information packets, extracting the D, Q, M bits and applying them to separate terminals, and extracting the other data and applying it to an input/output data bus, all of which are delivered to a controller. The controller then responds to the D, Q, M bits and other data to act upon the controlled device. The apparatus at any one of the locations can communicate with apparatus at any of the other locations in a similar manner.
REFERENCES:
patent: 5012470 (1991-04-01), Shobu et al.
patent: 5027343 (1991-06-01), Chan et al.
patent: 5060229 (1991-10-01), Tyrrell et al.
patent: 5062108 (1991-10-01), Bales et al.
patent: 5134614 (1992-07-01), Baydar et al.
patent: 5271010 (1993-12-01), Miyake et al.
Hamrick Claude A. S.
Hom Shick
Olms Douglas W.
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