发明名称 |
A control mechanism for a ring communication system. |
摘要 |
<p>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.</p> |
申请公布号 |
EP0161825(A2) |
申请公布日期 |
1985.11.21 |
申请号 |
EP19850302750 |
申请日期 |
1985.04.18 |
申请人 |
NORTHERN TELECOM LIMITED |
发明人 |
GAMMAGE, NEIL DAVID;PACHL, JAN KRTITEL;CASEY, LIAM MAURICE |
分类号 |
H04L12/433;(IPC1-7):H04L11/16 |
主分类号 |
H04L12/433 |
代理机构 |
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代理人 |
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主权项 |
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地址 |
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