The Force Model 2869 is designed to support full-duplex, asynchronous RS-232 or RS-422 type data communications in a multidrop, counter-rotating ring topology over multimode or single-mode optical fiber. Proper implementation of the Model 2869 allows for totally redundant, fault-tolerant, self-healing operations, providing uninterrupted communications between network nodes, even if a fiber break occurs or one or more transceivers in the ring fails. Each transceiver can be configured as a master, a local, or a submaster unit. State-of-the-art electro-optics are deployed for maximum unit reliability. All optical signals are fully regenerated at each transceiver, ensuring transparent, error-free data transmission throughout the network. The unit is available in a 4RU rack-mount configuration in addition to the rugged stand-alone module. These units are ideal for polled security systems, computer LAN, process control, and I.T.S. applications.