| 摘要 |
In a communication apparatus for transmitting a packet between plural communication apparatus, an inputted digital signal is converted into a signal having a form suitable for transmission and is sent out to the transmission line, and a check is made as to whether or not a signal exists on the transmission line for, if the signal exists thereon, issuing a busy signal and receive the signal existing thereon for converting the signal into a digital signal. In the communication apparatus, a priority observation unit observes the correspondence between a physical priority and application priority of a packet flowing on the transmission line on the basis of the converted digital signal, and a priority conversion unit accumulates the results of observations by the priority observation unit at intervals of given period of time to produce/update a conversion table between a physical priority and an application priority for obtaining a corresponding physical priority on the basis of a packet application priority inputted together with transmission packet data from the external. Moreover, when a timing of a priority time slot corresponding to the physical priority notified from the priority conversion unit is reached, a buffer unit sends out retained transmission packet data for transmission. This can effectively utilizing a transmission line while carrying out communication according to priority.
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