Abstract
The jumbogroup frequency supply (jfs) provides accurate and reliable synchronization signals to L5 jumbogroup multiplex carrier supplies. The jfs output-signal frequency is held to within several parts in 10 <sup xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">10</sup> of an input reference frequency. This extraordinary accuracy is achieved by digital frequency control of a precision quartz oscillator. The excellent reliability required when the jfs serves over 100,000 two-way voice circuits is achieved by redundant power and signal feeds, one-for-one protection of key circuits, and automatic protection switching. In addition to its L5 application, the jfs will also serve as a regional frequency supply in a new synchronizing frequency distribution network that will upgrade the entire Bell System transmission plant.
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