In ETSI EN 300 328 V2.1.1 (2016-11), section 18.104.22.168.3.1 Non-adaptive frequency hopping equipment (under Requirements for Frequency Hopping equipment limitations), it is stated:
The Accumulated Transmit Time on any hopping frequency shall not be greater than 15 ms within any observation period of 15 ms multiplied by the minimum number of hopping frequencies (N) that have to be used.
What is the meaning of
on any hopping frequency?
- Accumulated over all hopping frequencies, which means that the device must not transmit at all for an accumulated period of ((15 * (N-1)) / N) within the observation period.
- For each hopping frequency individually, which is a lot more permissive. This one seems less likely as it seems to be covered by other FH requirements (e.g. occupancy).
Or maybe another interpretation which I didn't think of?
We use a 2.4GHz frequency range, if that's relevant.