Communications network having bit-mapped refresh cycle

Details Communications network having bit-mapped refresh cycle Communications network having bit-mapped refresh cycle

1986-07-07

1988-01-05

Olms, Douglas W.

Multiplex communications

Wide area network

Packet switching

370 86, H04J 300, H04J 316

Patent

active

047180617

ABSTRACT:
A network for carrying real-time (RTS) and data services comprises stations (12) on a ring (11). Frames on the ring have a fixed boundary (15) between a real-time portion of the frame and a data portion. A sequence of cycles is initiated by a priority station. During a refresh cycle a bit map on the ring is marked by each station in turn to indicate which slots in the real-time portions are occupied. Next the stations bid for slots needed for new calls. During a third cycle information transfer for RTS calls takes place. After these cycles, priority is passed to the next station. The data portion may use a slotted ring or token ring data control protocol, and data transfer proceeds during RTS cycles. In an alternative version the boundary (15') may be relocated periodically depending on the level of real-time traffic.

REFERENCES:
patent: 3760106 (1973-09-01), Monti
patent: 4154983 (1979-05-01), Pederson
patent: 4251880 (1981-02-01), Baugh et al.
patent: 4538147 (1985-08-01), Grow
patent: 4549291 (1985-10-01), Renoulin et al.
patent: 4569041 (1986-02-01), Takeuchi et al.
patent: 4661952 (1987-04-01), Von Sichert et al.

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