Multiplex communications – Wide area network – Packet switching
Patent
1984-05-14
1986-01-21
Olms, Douglas W.
Multiplex communications
Wide area network
Packet switching
34082505, H04J 316
Patent
active
045660980
ABSTRACT:
The invention provides a ring communication network having an improved error recovery mechanism. The system uses a token or toggle signal which does not have an inherent control value but one that requires the values of a contiguous pair thereof to control access to the transmission medium of the system. A station recognizes that the ring is idle if the present value of the toggle signal is the same as the value of the toggle signal in the previous frame. Conversely, a station recognizes that the ring is busy if the present value of the toggle signal is different from the value of the toggle signal in the previous frame. A station that detects an idle toggle signal and wishes to transmit data on the communication ring changes the value of the toggle signal to that which corresponds to a busy status and transmits its data.
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Casey Liam M.
Gammage Neil D.
Pachl Jan K.
Northern Telecom Limited
Olms Douglas W.
Rokoff Kenneth I.
Turpin F. P.
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