Multiplex communications – Wide area network – Packet switching
Patent
1978-02-22
1982-03-16
Stewart, David L.
Multiplex communications
Wide area network
Packet switching
370 89, 370 94, H04J 602
Patent
active
043205020
ABSTRACT:
Multiple stations exchange information without central supervision. Stations requiring a cycle of access time on a shared time-divided bus participate in a cyclic access resolution process. The station having highest priority for a next bus cycle indicates its precedence to the other stations, and assumes exclusive use of the bus in the next cycle. The bus may comprise separate sections for data and response communications. Separate access resolution processes are conducted relative to each section. After gaining access to the bus for one cycle of data transfer a station becomes ineligible to compete for access to the data section until it receives an associated response. Accordingly receiving stations may control both the rate of data transmittal and the rate of access competition activity at associated origin stations. The data and response communications may include address information for enabling stations to intercommunicate directly in pairs. Data processing stations subject to multi-level interruption may present control signals designating acceptable interruption priority levels. Other stations seeking to interrupt such processing stations are eligible to compete for access to the bus only if assigned interruption priorities are at designated levels.
REFERENCES:
patent: 3303475 (1967-02-01), Hellerman
patent: 3425037 (1969-01-01), Patterson
patent: 3466397 (1969-09-01), Benowitz
patent: 3818447 (1974-06-01), Craft
patent: 3969703 (1976-07-01), Kwiatkowski
patent: 4035780 (1977-07-01), Kristick
International Business Machines Corp.
Lieber Robert
Stewart David L.
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