Transceiver for local network using carrier-sense multiple acces

Details Transceiver for local network using carrier-sense multiple acces Transceiver for local network using carrier-sense multiple acces

1981-05-26

1983-05-17

Ng, Jin F.

Telecommunications

Transmitter and receiver at separate stations

Single message via plural carrier wave transmission

455 78, 3408255, H04B 100, H04B 140

Patent

active

043843638

ABSTRACT:
A transceiver for a carrier-sense multiple access communications network using collision detection for controlling access to the network, and utilizing industry standard emitter-coupled logic (ECL) circuits in its receiver and transmitter. The transmitter output stage is an ECL current source. To prevent saturation of the transmitter output in the event of a collision, due to the voltage swing exceeding the compliance limit of the ECL current source, with a resulting failure of the collision detection mechanism, the power supply for the transmitter output stage supplies voltage in a first range of about -5 to -10 volts, while the power supply for the receiver input and collision detection circuits supplies voltage in a second, contiguous range of zero to about -5 volts. This permits the transmitter output to swing about 6-7 volts without exceeding the compliance limit of the current source, so that the collision is detectable by the collision detection circuits.

REFERENCES:
patent: 3048764 (1962-08-01), Murphy
patent: 3465252 (1969-09-01), McLean et al.
patent: 3742450 (1973-06-01), Weller
patent: 4063220 (1977-12-01), Metcalfe

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