Ferranti International Plc is to market Chipcom Corp’s ONline System Concentrator, designed to minimise local area network downtime (CI No 1,373). The Concentrator claims fault tolerance and the ability to support three independent networks. It uses a standard 19 rack-mounted chassis to provide up to 128 unshielded twisted pair and 64 fibre connections. The tri-channel architecture allows for concurrent Ethernet, Token Ring, and fibre distributed networks within the one concentrator, and it also facilitates bridging and routing between the networks. Fault tolerance is provided by the automatic switching of back-up power supplies and fibre optic links, and a dual port fibre o`tic transceiver is said to extend fault-tolerance to the desktop.