Tester for collision-detect circuitry

Details Tester for collision-detect circuitry Tester for collision-detect circuitry

1981-08-11

1983-04-12

Martin, John C.

Telecommunications

Transmitter and receiver at separate stations

Having measuring, testing, or monitoring of system or part

455226, 371 3, 371 57, 371 60, 370 85, 370 94, 3408255, H04B 1700

Patent

active

043800882

ABSTRACT:
A tester for the collision detector of a transceiver for a multiple access data communications network using carrier-sense collision detection for controlling access to the network. A squelch circuit is employed in the transceiver's transmitter for enabling and disabling the transmitter output. An end-of-transmission detector monitors the squelch circuit to detect the termination of a transmission. Upon termination of a transmission, a collision simulator circuit supplies to the transceiver's receiver a signal of predetermined amplitude and duration, to simulate the input the receiver gets when a collision actually occurs. If the receiver is working properly, it signals a collision to the host (i.e., computer, terminal, etc). If it does not receive the collision signal at the appointed time, the host knows that either the transceiver's collision detection circuit or the tester is not working.

REFERENCES:
patent: 4063220 (1977-12-01), Metcalfe et al.

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