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26.4.6.1.3.1
All communications and transmission channels used to receive signals between the proprietary supervising station and the protected premises control unit shall be operated manually or automatically once every 24 hours to verify operation.
26.4.6.1.3.2
If a communications or transmission channel fails to operate, the operator shall immediately notify the person(s) identified by the owner or authority having jurisdiction.
26.4.6.1.3.3* Coded Retransmission
Retransmission by coded signals shall be confirmed by two-way voice communications indicating the nature of the alarm.

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