74348363
Jan 14, 1993
Oct 11, 1994
digital fibre optic transmission and telecommunications system for the transmission of voice and data; namely, a multiplexer and fibre optic transceiver; a fault signal detector and signal generator for use on fibre optic lines to isolate a power grid fault condition and to monitor and provide data and control signals to an operation control center indicative of status conditions
Electrical and Scientific Apparatus