Importance

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Abstract

In a loop transmission system in which packet communications are made among a plurality of transmission/reception terminals which are connected in a loop, a higher degree of priority is given to a real time signal packet, while a lower degree of priority is given to a data packet. A communication path in each terminal is controlled according to the degree of priority such that a packet having a higher degree of priority will not be delayed when it passes through the terminal. Further, a transmission request command signal having an intermediate degree of priority is sent for effecting a real time signal transmission as well as full dual communication. In a modified embodiment, a traffic quantity detector is provided for sending out a real time information message. In another modification, an activity control circuit is added for controlling sending out of the voice packet according to a detected traffic quantity.

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First Claim