Circuit for recognizing data collisions in an optical data bus a

Details Circuit for recognizing data collisions in an optical data bus a Circuit for recognizing data collisions in an optical data bus a

1983-06-16

1985-01-01

Orsino, Jr., Joseph A.

Multiplex communications

Wide area network

Packet switching

370 94, 455612, H04B 900

Patent

active

044919425

ABSTRACT:
If data from more than one subscriber circulates on a bus link in an optical bus network structure in which access of the subscribers to the bus is not synchronously controlled, data collisions can occur. In order to guarantee a high data throughput on the bus, these data collisions must be avoided insofar as possible or must be quickly perceived. A circuit for identifying possible data collisions determines whether the bus is free for a subscriber wishing to transmit, and which permits collisions on the bus to be quickly identified and corresponding measures to be quickly initiated to prevent further collisions. The present invention enables a subscriber to a bus system to distinguish between a data collision and normal transmission errors. This distinction is made by concluding that a collision has occurred only when the bit error frequency is substantially higher than the probabilistically determined normal transmission error frequency.

REFERENCES:
patent: 4063220 (1977-12-01), Metcalfe et al.
"Ethernet: Distributed Packet Switching for Local Computer Networks" by Metcalfe et al., ACM, Jul. 1976, vol. 19, No. 7, pp. 395-404.

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