| 摘要 |
<p>A requesting user transmits, on a contention bus (BC) common to the users, a priority datum comprising his priority level and his address, and each user stores (in RI0 and REI1) the priority data arriving via the contention bus in order to determine, through comparison between the priority data of the requesting users, which one is authorised to transmit in each of the elementary time channels forming the time frame. A user having begun to transmit in one or more time channels may be interrupted before the end of his transmission by another requesting user effecting an override by virtue of a higher priority datum, the successive interruptions possibly being concatenated. The contexts of the interrupted communications are saved (in MC, MT) in the order of the successive interruptions, and exit in the reverse order when the communication medium becomes available again, the contexts of the most recently interrupted communications exiting first. <IMAGE></p> |
