| 摘要 |
<p>Stations (S1, ..., Sn, ..., Sp), to which are attached data transmission terminals (T1-1 to T1-n1, ..., Tn-1 to Tn-n, ..., Tp-1 to Tp-np), are connected by links (MIC1-2, ..., MIC(n-1)-n, MICn-(n + 1), ..., MICp-1) which define at least one virtual loop forming at least one communication channel passing through all the stations and conveying frames which transport at least one access token, for signalling and for data. Each station includes its own local bus (BL1, ..., BLn, ..., BLp), write-access to which by the data transmission terminals is governed by a contention protocol, access by a terminal transmitting over the communication channel being carried out via the local bus; means for picking up the access token being transmitted over the communication channel in response to an access request coming from one or more terminals attached to the station, and means for retransmitting the access token over the communication channel after the requesting terminal or terminals have successively transmitted their respective messages via the local bus. <IMAGE></p> |
