Multiplex communications – Wide area network – Packet switching
Patent
1987-11-06
1989-03-14
Griffin, Robert L.
Multiplex communications
Wide area network
Packet switching
34082505, H04J 316
Patent
active
048130397
ABSTRACT:
A data transmission control unit having a function of receiving a token having source address information on a loop transmission line, getting a transmission right, transmitting the information frame and then sending the token to abandon the transmission right, comprises means for determining whether the relay of the token sent by its own unit successed or not based on the time elapsed after the token has been sent, and control means for not transmitting the token when the relay was successful and retransmitting a new token only when the relay was not successful.
REFERENCES:
patent: 4494233 (1985-01-01), Bahr et al.
patent: 4567590 (1986-01-01), Bedermas
patent: 4593280 (1986-06-01), Gron
patent: 4604742 (1986-08-01), Hamada et al.
patent: 4701908 (1987-10-01), Ikeda
Griffin Robert L.
Hitachi , Ltd.
Scutch, III. Frank M.
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