Multiplex communications – Wide area network – Packet switching
Patent
1983-12-21
1985-10-29
Olms, Douglas W.
Multiplex communications
Wide area network
Packet switching
370 94, 370 60, H04J 302, H04J 300, H04J 600, H04Q 1104
Patent
active
045504016
ABSTRACT:
A packet switching system having local area communication networks supporting telephone trunk circuits by utilizing delivery information. The networks utilize serial, unidirectional, broadcast-type paths to which stations are passively coupled in a sequential manner; and packets transmitted on those paths each comprise an address field and a delivered bit field. The trunk circuits or common resource units are connected to a network by a group of stations which all respond to a group address. A station requiring trunk circuit facilities transmits a packet containing the group address and a delivered bit in the reset state. The first idle trunk circuit station to receive that packet makes its attached trunk circuit available to the transmitting station and sets the delivered bit indicating that a trunk circuit has been made available to the transmitting station. All subsequent stations in the group upon detecting that the delivered bit has been set ignore the packet. Similarly, the delivery information in the delivered bit field controls the transmission or communication of another packet to its destination station through serially interconnected networks, and that packet does not advance through further networks once the delivered bit has been set indicating that the other packet has been delivered to its destination. The destination station sets the delivered bit upon receipt of the packet.
REFERENCES:
patent: Re31319 (1983-07-01), Fraser
patent: 4007441 (1977-02-01), Faber
patent: 4284976 (1981-08-01), Gable et al.
patent: 4287592 (1981-09-01), Paulish et al.
patent: 4389721 (1983-06-01), Young et al.
patent: 4412326 (1983-10-01), Limb
"Description of FASNET-A Unidirectional Local Area Communication Network", The Bell System Technical Journal, J. O. Limb, et al., vol. 61, No. 7, Sep., 1982, pp. 1413-1440.
AT&T Bell Laboratories
Chin Wellington
Moran John C.
Olms Douglas W.
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