Abstract: A queue state access protocol device for serial exchange of numerical information among terminals interconnected by an optical fiber star network, transmits queue state data over a small fraction of the network's total information channel capacity. A circuit measures the distance from each terminal to the star center and allows the terminals to synchronize their respective queue state transmissions, thereby minimizing the physical occupation of transmission channels. The delay queue for accessing the network is managed by a microprocessor which is provided in each terminal of the network.