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The 57A microwave path protection system: An automatic switching system for transmission protection of microwave radio-relay systems

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2 Author(s)
Hesselgrave, D. H. ; Lenkurt Electric Company, Inc., San Carlos, Calif. ; Kebby, M. H.

The 57 A protection system is a fault-sensing and switching system, which serves as an automatic guardian of the quality of a broad-band (1,300 kc) transmission channel. Acting upon a loss in transmission level, or an increase in noise, it transfers a communication traffic load from a failing regular channel to a normally unassigned stand-by channel. The transmission protection afforded by the stand-by channel is shared among as many as three regular channels.

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American Institute of Electrical Engineers, Part I: Communication and Electronics, Transactions of the  (Volume:79 ,  Issue: 6 )