Multiplex communications – Wide area network – Packet switching
Patent
1991-08-26
1993-07-13
Olms, Douglas W.
Multiplex communications
Wide area network
Packet switching
34082505, 34082518, 370 55, 370 8530, H04J 302, H01H 6700
Patent
active
052280276
ABSTRACT:
Data communication units and a data communication apparatus comprising a plurality of the units which can prevent transmission collision and can transfer the transmission initiative without a token as typically required in a token-ring network. The unit has a relay unit generating a relay signal by a received signal, a transmitter generating a transmission signal comprised of its own original data, and a sending controller which selects a send signal among the relay signal and the transmission signal and generates a non-signal state by monitoring the send signal or the received signal sent through a transmission route. The sending controller is capable of transferring the transmission initiative, and includes a first timer which generates a trigger output for selecting the transmission signal after a non-signal state continued a first prescribed time TM, a second timer which starts and maintains a non-signal state for a second prescribed time TF (TF>TM) after the owner unit having the transmission initiative finishes sending, and a sending control circuit which controls a data selector to switch the send signal by the trigger output, a request-to-send signal RTS usually given by a transmission source computer, and a transmission enable signal TES produced by the received signal, and to generate a non-signal state throughout the time TF by the signal RTS reversing the polarity. Transmission collisions can be prevented by utilizing the signal TES or providing proper values for the time constant TM and TF. The transfer of the transmission initiative is performed by controlling the sending controller and the signal RTS.
REFERENCES:
patent: 4727539 (1988-02-01), Arita et al.
patent: 4751697 (1988-06-01), Hunter et al.
patent: 4780870 (1988-10-01), McHarg et al.
patent: 4930122 (1990-05-01), Takahashi et al.
Yamaguchi, U.S. Patent Application Ser. No. 716,876, Jun. 18, 1991.
Olms Douglas W.
Patel Ajit
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