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A data communication system allocates use of a common data communication medium shared by a plurality of stations. During each transmission cycle, the communication medium carries data packets of varying priority which each station receives. The stations are allocated use of the communication medium

A data communication system allocates use of a common data communication medium shared by a plurality of stations. During each transmission cycle, the communication medium carries data packets of varying priority which each station receives. The stations are allocated use of the communication medium during one or more priority intervals as a function of the priority of the packet which the station is ready to transmit. Each station is synchronized to a transmission cycle period which is divided into subperiods. Certain types of packets are relegated to transmission and reception within predetermined subperiods.

대표청구항 ▼

A multistation communication system having a plurality of stations coupled to a common communication medium for carrying packets among the stations; in which at the end of each packet, each station selects a different time slot for transmission and a first station with a packet to transmit which rea

A multistation communication system having a plurality of stations coupled to a common communication medium for carrying packets among the stations; in which at the end of each packet, each station selects a different time slot for transmission and a first station with a packet to transmit which reaches its selected time slot before any other station has begun transmission is enabled to transmit that packet; each station comprising: means for transmitting, as part of each packet, data from which can be derived a first time value which is a function of a time delay between the end of the last packet and the selected time slot of the station transmitting the present packet; means for deriving the first time value from the data contained in the present packet received; means for measuring a time period which is a function of a time delay between the end of the last packet and the beginning of the present packet to produce a second time value; and means for comparing the first time value and the second time value to identify a slot error signal if the first and second time values do not have a predetermined relationship.