Jumbogroup Frequency Supply

The jumbogroup frequency supply provides the jumbogroup multiplex terminals with signals having the frequency accuracy
(\Delta F/F < 1/10^{8})
required for frequency multiplexing 10 800 message channels. In addition to frequency precision, reliability is of utmost importance since many jumbogroup multiplex terminals are to be supplied by one jumbogroup frequency supply. Protection switching of redundant circuits and close monitoring of circuit conditions have been included in the design. Another major aspect of reliable operation is the man-machine interface, which has been engineered to minimize man-made service interruptions.