| 摘要 |
In a CSMA/CD Ethernet network, an Ethernet interface chip (28) of a target node (15, 12) is equipped with a jam signal (38) for enabling the target node (15, 12) to control the flow of incoming data packets from the channel (16). The jam control signal (38) provides a mechanism for the target node (15, 12) to force collisions on the channel (16), forcing the source node (14) to retransmit the "rejected" data packets at a later time, as determined by a predefined "backoff" algorithm. When a jam signal (38) is activated, and the target node (15, 12) begins receiving incoming data packets from the channel (16), the target node (15, 12) refuses acceptance of all incoming data packets by immediately and automatically transmitting a dummy packet across the channel (16), intentionally forcing a collision, and causing the source node (14) to "backoff" and retransmit at a later time. The dummy data packets are transmitted by the target node (15, 12) at a physical layer of the Ethernet protocol, bypassing standard Ethernet transmission protocol of submitting the dummy data packet to a media access controller (26).
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