Local area network

Details Local area network Local area network

1985-03-07

1987-02-03

Griffin, Robert L.

Telecommunications

Receiver or analog modulated signal frequency converter

Signal selection based on frequency

455 69, 370 74, H04B 900, H04J 102

Patent

active

046413758

ABSTRACT:
In a local area network (LAN), of the Ethernet type, one of the segments, i.e. one bus, is replaced by a star coupler connected via optical fibre pairs to a number of stations. Each pair includes a GO fibre and a RETURN fibre. As in the usual Ethernet system, collision detection relies on measuring signal level on the medium, if it is too large then a collision condition exists.
In an optical fibre system a similar collision detection technique is used. To detect collision, it is nescessary to be aware of the network's attenuation as "seen" by the station. To do this a low level pilot tone is sent from each station, each station having its own tone frequency. The amplitude of this tone when it returns to its own station indicates the system's attenuation, and this is used to detect collision.
In an alternative the pilot signals are pseudo-random bit sequences.

REFERENCES:
patent: 2924703 (1960-02-01), Sichak et al.
patent: 3315164 (1967-04-01), Ferguson, Jr. et al.
patent: 3325600 (1967-06-01), Fierston et al.
patent: 4234968 (1980-11-01), Singh
patent: 4317235 (1982-02-01), Tsukada
patent: 4562582 (1985-12-01), Tokura et al.

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