PLANET EPN-103 - Manual (Page 13)

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3.3 Verifying the Installation
After power on the ONU, the Power LED will be light and ONU system
will start to check the Optical signal. If the ONU system receives the
optical signal, the PON LED will be light and ONU system will start to
register. If OLT and ONU register successful, the Link LED will be light
which means that the connection is establishing.
Note
The PLANET GEPON Solution based on the Teknovus
GEPON Technology. The ONU was designed with PLANET
OLT EPL-2000 system. If your connection device is third
party OLT system, even the OLT is Teknovus solution; the
PON connection might be unstable and malfunction, due
to the configurations of ONU must depend on the OLT
settings. If the ONU can’t work properly with other brand
OLT, please make sure your PON system and contact the
third party OLT vendor for technical support.