Multiplex communications – Wide area network – Packet switching
Patent
1980-06-11
1982-10-12
Robinson, Thomas A.
Multiplex communications
Wide area network
Packet switching
370 60, H04J 300, H04Q 1104
Patent
active
043542638
ABSTRACT:
A computer-communications concentrator for establishing connections between a plurality of asynchronous computer-communications terminals and a two-way computer-communications channel for transmission and switching of packetized data. The concentrator is comprised of one processing unit which is operated asynchronously and is connected to the computer-communications terminals. One X25 interface normalizing function processing unit is connected to the two-way computer-communication channel, with, between the two processing units, a communication system comprised of one memory unit having a first part in which each packet transmitted in one or the other direction is stored, and a second part comprised of forward and return cell pairs. Each cell is provided to store a packet header during a transfer into the communication system, each local header containing the address of the packet stored in the first part of the memory unit, its length, and some data relevant to the type of packet, the interpretation of which is used to determine in the processing unit which reads it, the appropriate processing to be done for the packet at hand. Each link between a terminal and the two-way channel makes use of a couple of selected pairs of cells, each packet being stored in a location available from the first part of the processing unit which introduces this packet into the memory inserting a local header in the corresponding outgoing cell from the associated cell pair, then transferring this local header into the return cell of the other pair from the set associated with the unit which will output the packet from the memory unit when this cell is available as indicated by a particular value of the packet type information.
REFERENCES:
patent: 3766322 (1973-10-01), Moffett et al.
patent: 4156798 (1979-05-01), Doelz
patent: 4271507 (1981-06-01), Gable et al.
"Interface Standards for Public Data Networks", by Folts, Computer Communications Networks, 1978, pp. 246-252.
"Some Design Aspects of a Public Packet Switched Network", by Nakamura et al., Nippon Tel. and Tel., Toronto, Aug. 1976, pp. 317-322.
"Telecommunications Networks for EURONET", by Kelly and Lee, The Post Office Electrical Engineer, Jan. 1978, pp. 208-216.
Bordry Herve
L'Hostis Jean-Claude
Layec Herve
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