| 摘要 |
<p>PURPOSE:To prevent the residence of a frame from being generated by comparing a timer value in a received communication frame with the one stored in a timer value table classified by every transmission origin, and diciding whether the received communication frame should be deleted or transmitted to another node. CONSTITUTION:The timer value is checked at a timer value check part 121 by using the timer value table 122 classified by every transmission origin. In the timer value table 122 classified by every transmission origin, the latest timer value classified by every transmission origin is stored, and the timer value of a node corresponding to the timer table 122 classified by every transmission origin is read out from a transmission origin address in a reception frame, then, it is compared with the timer value 183 in the frame. When the timer value in the reception frame is larger than that of the frame, it is identified as an effective frame, and the timer value of the transmission origin is rewritten by the timer value in the reception frame by a table update part 124. When the timer value in the reception frame is equal to or less than the timer value in the timer table 122 classified by every transmission origin, it is deleted, and no transmission to another node is performed.</p> |
