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21
Troubleshooting
7
Troubleshooting
7.1
Duty cycle
The wireless DHC accessories operate in the following frequency bands:
•
868,000~868,600 MHz
•
869,400~869,650 MHz
In order to safeguard operation of all devices working in this range, it is
legally required to limit the transmission time of devices. Limiting the
transmission time minimizes the risk of interference.
The ‘duty cycle’ is the maximum transmission time. It is the ratio of the time
that a device is actively transmitting in comparison to the measurement
period (1 hour), and is expressed as a percentage of 1 hour.
If the total amount of allowed transmission time is reached, the DHC
accessory will stop transmitting until the time limit is reached.
For example, when a device has a duty cycle limit of 1%, it is only allowed
to transmit 36 seconds in 1 hour. After this, it will stop transmitting until the
1 hour limit is reached.
DHC accessories fully comply to this limitation and use 2 frequency bands
with a duty cycle of respectively 1 % and 10%.
During normal operation of the DHC accessories, this limit is not usually
reached. However it is possible that the limit is reached during start-up or
during a fresh installation of a system. In this case, the LED of the accessory
lights up red. It may be non-responsive for a short period (max. 1 hour),
until the time restriction for transmission has expired. After this period, it will
operate normal again.
Содержание Home Controls EKRMIBEV1V3
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