Patent
1974-08-12
1976-10-12
Olms, Douglas W.
179 15AP, H04J 308
Patent
active
039859622
ABSTRACT:
A closed loop communication system in which the terminals are grouped into priority classes. Any terminal can seize a free channel if certain priority conditions exist. A channel (frame) is always preceded by a header comprising a priority request field and a priority grant field. The request field has n bits assigned to the n priority classes; a terminal requiring service sets that bit to "1" which corresponds to its class. Thus, the controller receives a compiled overall request and inserts, for the next cycle, into the grant field an indication as to which priority class or classes are now allowed access to the channel. This is accomplished by shifting the contents of the request field to the grant field. A terminal can only seize the channel if its priority class is allowed for that cycle by the grant field, and if the channel is still free.
REFERENCES:
patent: 3408632 (1968-10-01), Hauck
patent: 3597549 (1971-08-01), Farmer et al.
patent: 3639904 (1972-02-01), Arulpragasam
patent: 3680056 (1972-07-01), Kropfl
patent: 3706974 (1972-12-01), Patrick et al.
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patent: 3764981 (1973-10-01), Takasugi
Jones Ivor
Mueller Hans R.
Wild Daniel
Zafiropulo Pitro A.
Arnold Jack M.
International Business Machines - Corporation
Olms Douglas W.
Siber Victor
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