Patent ID: 7688845

Claim:
An arrangement in connection with a telecommunications system comprising a data transmission path, the arrangement comprising devices using the data transmission path for data transmission, data being transmitted on the data transmission path between the devices in messages cyclically according to at Least one cycle having a substantially constant cycle time, wherein one or more of the devices are configured to: monitor in their turns during one or more first turns, respectively, the cyclic traffic of the data transmission path in the telecommunications system; and set the timing of their own cyclic traffic on the data transmission path between cyclic traffic detected based on the monitoring; and wherein one or more of the devices are configured, during a second turn, to: monitor the cyclic traffic on the data transmission path of the telecommunications system to determine on the basis of the monitoring and the cycle time of the at least one cycle of the cyclic traffic at least one expected occurrence time slot of the cyclic traffic; and transmit a non-cyclic message that does not belong to the cyclic traffic to the data transmission path on the basis of at least one determined occurrence time slot of the cyclic traffic such that the message does not collide with one or more messages of the cyclic traffic which occur in the determined at least one occurrence time slot and the periodic nature of the cyclic traffic is maintained.