Multiplex communications – Wide area network – Packet switching
Patent
1985-05-28
1986-11-18
Olms, Douglas W.
Multiplex communications
Wide area network
Packet switching
370 98, H04J 308
Patent
active
046239987
ABSTRACT:
In a communication network in which a plurality of information processors are coupled to a communication medium through medium attachment units (MAUs), a pilot signal generator sends a pilot signal of a reference level to a predetermined point of the communication medium. Each MAU has a gain controller to control the gains of transmission and reception amplifiers. This gain controller adjusts the gain of the reception amplifier when the pilot signal is received in accordance with the reception level thereof and then allows a test signal to be transmitted to the communication medium through the transmission amplifier. The gain of the transmission amplifier is adjusted in accordance with the reception level of this test signal such that the reception level of the test signal becomes equal to the reception level of the pilot signal. Each MAU is provided with a random number data generator and sets the transmission time slot of the test signal in dependence on random number data to prevent simultaneous transmission of test signals from MAUs.
REFERENCES:
patent: 4251881 (1981-02-01), Ruether
patent: 4271503 (1981-06-01), Eumurian et al.
patent: 4281408 (1981-07-01), Bonneiot
Haruyama Hideaki
Hirose Tsuguhiro
Kobayashi Hiroshi
Kabushiki Kaisha Toshiba
Olms Douglas W.
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