§ 10.520   Common audio attention signal.

   A Participating CMS Provider and equipment manufacturers may only
   market devices for public use under part 10 that include an audio
   attention signal that meets the requirements of this section.

   (a) The audio attention signal must have a temporal pattern of one long
   tone of two (2) seconds, followed by two short tones of one (1) second
   each, with a half (0.5) second interval between each tone. The entire
   sequence must be repeated twice with a half (0.5) second interval
   between each repetition.

   (b) For devices that have polyphonic capabilities, the audio attention
   signal must consist of the fundamental frequencies of 853 Hz and 960 Hz
   transmitted simultaneously.

   (c) For devices with only a monophonic capability, the audio attention
   signal must be 960 Hz.

   (d) No person may transmit or cause to transmit the WEA common audio
   attention signal, or a recording or simulation thereof, in any
   circumstance other than in an actual National, State or Local Area
   emergency or authorized test, except as designed and used for Public
   Service Announcements (PSAs) by federal, state, local, tribal and
   territorial entities, and non-governmental organizations in
   coordination with those entities, to raise public awareness about
   emergency alerting, provided that the entity presents the PSA in a
   non-misleading manner, including by explicitly stating that the
   emergency alerting attention signal is being used in the context of a
   PSA for the purpose of educating the viewing or listening public about
   emergency alerting.

   (e) A device may include the capability to mute the audio attention
   signal.

   [ 73 FR 43117 , July 24, 2008, as amended at  81 FR 75727 , Nov. 1, 2016]

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