Loop network system controlled by a simple clock station

Details Loop network system controlled by a simple clock station Loop network system controlled by a simple clock station

1986-01-30

1986-12-02

Olms, Douglas W.

Multiplex communications

Wide area network

Packet switching

3408255, 370 89, H04J 300

Patent

active

046270515

ABSTRACT:
In a loop network system comprising a plurality of stations connected by a loop-shaped transmission path (38) wherein each station may utilize the transmission path, the improvement wherein the stations are divided into a clock station and node stations between which control and priority functions are distributed. The clock (30) station transmits, to the path at a predetermined period, a synchronization signal block serving to trigger the node stations (31-36) and to define a highest degree of priority for transmission. A trigger signal block is also transmitted from the clock station to the path so as to define a lower degree of priority each time when a transmission right is seized by the clock station within the predetermined period. Each of the node stations transmits a transmission signal block to the path by seizing a transmission right in consideration of the degree of priority indicated by each of the synchronization and the trigger signal blocks. Each transmission right is given to each station when no signal block is present on the path. A pair of token blocks may be used to guarantee communication of the highest degree of priority and communication of lower degree in the predetermined period.

REFERENCES:
patent: 3863220 (1975-01-01), Osawa et al.
patent: 4042783 (1977-08-01), Gindi
patent: 4320502 (1982-03-01), deVeer
patent: 4404557 (1983-09-01), Grow
patent: 4432054 (1984-02-01), Okada et al.
patent: 4439763 (1984-03-01), Limb
patent: 4454508 (1984-06-01), Grow
patent: 4459588 (1984-07-01), Grow

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