| 摘要 |
<p>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.</p> |
