38
Troubleshooting
8.2
Duty cycle
The duty cycle is a legally regulated limit of the transmission
time of devices in the 868 MHz range. The aim of this regu-
lation is to safeguard the operation of all devices working in
the 868 MHz range. In the 868 MHz frequency range we use,
the maximum transmission time of any device is 1% of an hour
(i.e. 36 seconds in an hour). Devices must cease transmission
when they reach the 1% limit until this time restriction comes
to an end. Homematic IP devices are designed and produced
with 100% conformity to this regulation.
During normal operation, the duty cycle is not usually reached.
However, repeated and radio-intensive teach-in process-
es mean that it may be reached in isolated instances during
start-up or initial installation of a system. If the duty cycle is
exceeded, this is indicated by one long flash of the device LED
(D)
, and may manifest itself in the device temporarily working
incorrectly. The device starts working correctly again after a
short period (max. 1 hour).
