Multiplex communications – Wide area network – Packet switching
Patent
1981-06-10
1983-04-12
Robinson, Thomas A.
Multiplex communications
Wide area network
Packet switching
H04J 300, G06F 1516
Patent
active
043800637
ABSTRACT:
In a communication network comprising block switching nodes interconnected by transmission links, a flow control mechanism is provided in each switching node for regulating the flow of addressed data blocks or messages. A hardware look-ahead mechanism effective within each node tests for each data block received from a link and buffered at an input port, whether it can be accepted at the appropriate output port of the same node for further transmission. A token mechanism effective over links permits maintenance at each output port of a node of an indication whether any data block can be accepted in the input port at the other end of the respective link. By the combined operation of look-ahead mechanisms and token mechanisms the flow of addressed messages in a direction where the transmission path is already filled up is prevented. This has a positive smoothing effect on overall traffic flow where short-time or local overloads occur.
REFERENCES:
patent: 4032899 (1977-06-01), Jenny et al.
Bocker: "Moglichkeiten und Grenzen von Paketvermittlungsnetzen", Telcom Report 1 (1978) Heft 2, pp. 110-117.
Filipowsky et al.: "Digital Data Transmission Systems of the Future", IRE Trans. on Comm. Syst., vol. CS-9, Mar. 1961, pp. 88-96.
Manual: "IBM Synchronous Data Link Control" (Form No. GA27-3093, General Information, Undated).
Reiser et al.: "Queueing Network Models: Methods of Solution and their Program Implementation", Chapter 4 of Current Trends in Programming Methodology, vol. III: Software Modeling, Prentice-Hall, 1978.
Janson Philippe A.
Muller Hans R.
Rothauser Ernst H.
Frisone John B.
International Business Machines Corp.
Robinson Thomas A.
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