| 摘要 |
A data processing station wherein a network interface (I; RE) monitors the transmission channel and generates event signals, e.g. "transmission start", "collision detected" and "channel back to vacant condition". If a collision occurs in local transmission, transmission is maintained with a collision indication for at least one period (C) before being cut off. An observation register (RO) receives the event signals and responds by generating a channel observation signal which may be "transmission OK", "collision slot" and "vacant slot". When transmission of a fresh data packet is requested, a first transmission may or may not be attempted (normal mode) depending on the condition of the observation register. If the attempt is unsuccessful (transmission refused or collision), a suitably reset mechanism for incrementing/decrementing a common integer (E) determines the right to transmit, so that the response to a request for the transmission of a fresh data packet is made regardless of the channel's operating record, upstream from the last normal mode to be executed.
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