Transceiver having collision detection capability for contention

Details Transceiver having collision detection capability for contention Transceiver having collision detection capability for contention

1983-05-31

1985-05-21

Olms, Douglas W.

Multiplex communications

Wide area network

Packet switching

370 85, 3408255, 455 58, H04J 600

Patent

active

045190747

ABSTRACT:
A transceiver provides data collision detection and avoidance in a contention-formatted, FDM communications network using FSK modulation. Locally-generated baseband data is compared to recovered baseband data received from the system bus. A failure to compare indicates that there has been a data collision. The wide disparities in amplitude between locally-generated FDM signals and signals received from the bus are accommodated by a signal splitter which provides greater attenuation of the local signal than the generally weaker bus signal, and by the use of logarithmic amplifiers which generate relatively constant output levels for a wide range of input signal amplitudes. Collision avoidance is provided by monitoring the bus signal demodulators for data activity, and by inhibiting the local transmitter when such activity is detected, subject to an override during transmission by the local station.

REFERENCES:
patent: 4063220 (1977-12-01), Metcalfe et al.
patent: 4099024 (1978-07-01), Boggs et al.
patent: 4292623 (1981-09-01), Eswaran et al.
patent: 4328586 (1982-05-01), Hansen
patent: 4366480 (1982-12-01), Van Hatten
patent: 4376278 (1983-03-01), Jacobsthal
patent: 4409593 (1983-10-01), Bose

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