Synchronized multiple access apparatus and method for a local ar

Details Synchronized multiple access apparatus and method for a local ar Synchronized multiple access apparatus and method for a local ar

1986-04-15

1988-09-20

Olms, Douglas W.

Multiplex communications

Wide area network

Packet switching

370 94, H04J 326

Patent

active

047730668

ABSTRACT:
The present access protocol for contention networks results in synchronous network operation. Each node determines the next transmission instant by counting from the beginning of the most recently received packet of information a time equal to that packet's labeled length minus the previously measured round trip propagation delay seen by the node. Subsequent instants will occur at intervals equal to the maximum propagation delay allowed on the network. Each time a subsequent packet is received, synchronization is rederived based on the packet. If no packets are received within predetermined slots, the network is considered to be in asynchronous mode, with transmissions allowed at any time following the next slot. The disclosed packet synchronized multiple access (PSMA) protocol improves the performance measures by which local area networks are evaluated.

REFERENCES:
patent: 4538263 (1985-08-01), Gabrielli et al.
patent: 4562573 (1985-12-01), Murano et al.
patent: 4637015 (1987-01-01), Bobey

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