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A radiation-hardened "dual-rate MIL-STD-1773" transceiver was first developed for military command/response time-division-multiplexed data bus applications. The transceiver operates at dual rates of 1 and 20 Mb/s over temperature (-25 to +85 C). With Manchester-II burst messages, the dual-rate transceiver showed a large dynamic range of greater than 20 dB in support of 32-node star network; a sensitivity of -38.7 dBm and a saturation of -16.1 dBm (limited mainly by an LED test source power) at BER/spl les/1/spl times/10/sup -10/. These transceivers are currently used for space and military applications such as DARPA, NASA and JPL programs.