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23.16.4.9.1
Radio frequency pathways designated as Class B shall operate as follows:
  1. A redundant path is not included.
  2. Operational capability is verified via end-to-end communication.
  3. Conditions that affect the intended operation of the pathway are annunciated as a trouble signal.
  4. Operational capability stops at the affected portion of the pathway.
  5. Each transceiver and/or repeater in a radio frequency pathway is powered by one of the following means:
    1. Both a primary and a secondary source meeting Section 10.6
    2. Multiple primary batteries meeting 23.16.2.2
23.16.4.9.2
Where operational capability is to be maintained during a fault, the operational capability shall be restored within 200 seconds of the application of the fault.

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