Control mechanism for a ring communication system

Details Control mechanism for a ring communication system Control mechanism for a ring communication system

H - Electricity

04

L

340/84

H04L 5/14 (2006.01) H04L 12/433 (2006.01)

Patent

CA 1204189

A CONTROL MECHANISM FOR A RING COMMUNICATION SYSTEM Abstract of the Disclosure 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 is 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. - i -

453966

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