??? ID codes that identify a system component.
??? Variable data accompanied by a control or ID code.
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The duration of transmissions has limits that vary with the activation method
and purpose:
??? A transmitter with automatic activation must cease transmitting within 5
seconds of activation.
??? A transmitter with manual activation must cease transmitting within 5
seconds of being released after use.
??? Polling to determine system integrity in security or safety applications is
allowed for a total of up to 2 s/hr per transmitter.
??? Operation of any duration is allowed during an emergency.
Subsection e allows these additional uses with further restrictions:
??? Voice and video.
??? Toy control.
??? Variable data without a control code.
??? Periodic transmissions at regular, predetermined intervals (other than
polling for system integrity as described in subsection a).
Transmissions under subsection e have these restrictions:
??? The maximum allowed field strength of the fundamental frequency and
spurious emissions are up to 60% less compared to transmitters under
subsections a??“d.
??? The maximum transmission time is 1 second.
??? The minimum period between transmissions is at least 10 seconds and
must be at least 30 times longer than the transmission period. For example,
after transmitting for 0.3 second, a device must wait 10 seconds
before transmitting again.
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