Communications: electrical – Continuously variable indicating – With meter reading
Patent
1980-09-25
1982-06-29
Yusko, Donald J.
Communications: electrical
Continuously variable indicating
With meter reading
178 2R, 307270, 370 85, H04Q 900, H04L 514, H03K 1756
Patent
active
043374654
ABSTRACT:
This disclosure relates to a line driver circuit for a station in a data transmission network, which driver circuit is adapted to drive the channel medium with a constant current so that conflicts or collisions with data transmissions from other stations will be cancelled out thereby preventing any particular station from dominating reception of a neighboring station. Each station is adapted to operate in a cyclic mode for contending for access to the network channel where a three-state cycle is employed, which states are the idle state, the packet-being-transmitted state and the acknowledgment period state. Each station will not begin transmission until it determines that the tunnel is in an idle state. Once the station has determined that the channel is idle, it will then delay for a period of time that is randomly chosen and, if the channel is still idle, will then begin transmission. Following transmission, the channel will again be quiescent for a short period of time before the acknowledgment signal is transmitted from the receiver. Each packet of data to be transmitted is of a fixed length so as to provide for synchronization between the various stations contending for access to the channel.
REFERENCES:
patent: 3297954 (1967-01-01), Wiley
patent: 3358216 (1967-12-01), Kostuch
patent: 3486040 (1969-12-01), McMillin
patent: 3959665 (1976-05-01), Gilbreath et al.
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patent: 4207555 (1980-06-01), Trombly
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Gerhold Mark L. C.
Spracklen John E.
Burroughs Corporation
Peterson Kevin R.
Young Mervyn L.
Yusko Donald J.
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