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Protection switching system for microwave radio

  • US 4,039,947 A
  • Filed: 06/29/1976
  • Issued: 08/02/1977
  • Est. Priority Date: 06/29/1976
  • Status: Expired due to Term
First Claim
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1. An improved microwave protection switching system of the type that includes:

  • a receiving antenna;

    a transmitting antenna;

    a plurality of channel-separating networks connected to said receiving antenna;

    a plurality of channel-combining networks connected to said transmitting antenna; and

    a corresponding plurality of microwave repeaters respectively interconnecting said channel separating and channel-combining networks, each of said repeaters being tuned to a uniquely assigned pair of transmitting and receiving frequencies, wherein the improvement comprises;

    a corresponding plurality of remotely operable input and output shutters respectively associated with the input and output circuits of said microwave repeaters;

    a frequency-agile-repeater remotely tunable to any of said pairs of frequencies;

    means for connecting said frequency-agile-repeater to said receiving and transmitting antennas;

    first means for monitoring the performance of each of said microwave repeaters and for generating a first alarm signal when any one of said repeaters fails or becomes marginal; and

    means, responsive to said first alarm signal, for closing the input and output shutters associated with the failed repeater and for simultaneously re-tuning said frequency-agile-repeater to the transmitting and receiving frequencies of said failed repeater, whereby the microwave signal normally repeatered by the failed repeater is repeatered by said frequency-agile-repeater.

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