Introduction: ONU (optical network unit) is divided into active optical network unit and passive optical network unit, ONU is a user-side device in the optical network, placed on the user side, used in conjunction with OLT, to achieve Ethernet layer 2, layer 3 function, to provide users with voice, data and multi-** services.
ONU Panel Indicator Description:
Power light: Green Off: Power off On: Power on.
PON light: Green On: Solid light indicates that the board self-test has passed and the device is operating normally.
LOS light: not lit: normal state.
Judge user faults: Most of the faults are optical path faults and ONU device faults, first check whether the panel indicator is normal. If the optical path is faulty, see the status of the PON lamp: the PON lamp is solid green, which means that the optical path is normal, and the PON lamp is off, which means that the optical path is broken.
Test the optical path with an optical power meter, the qualified range of optical power is: 1490nm file: between -8db and -28db, if the range is exceeded, it will affect the normal working quality of the ONU, and the user's Internet access will be affected.
The attenuation of the 1:2 splitter is -3dB
The 1:4 splitter attenuates to -6dB
The attenuation of the 1:8-channel splitter is -9dB, the attenuation of the 1:16-channel splitter is -12dB, the attenuation of the 1:32-channel splitter is -15dB, and the attenuation of the 1:64-channel splitter is -18dB
If the optical power output of the splitter pigtail is qualified, please replace the fiber core between the optical cable transfer box and the building, generally to the building we have laid at least two fiber cores, and then test at the end after the replacement, if the pigtail optical power of the splitter is unqualified, please replace the spare pigtail, and test a qualified one connected to the building pigtail with an optical power meter.
If it is an optical path fault: first unplug the pigtail on the ONU to test the optical power, no light or the power is unqualified, please go to the flange of the optical cable transfer box to find the one of the corresponding optical splitters 1-32 pigtails of the ONU, unplug the pigtails from the flange to test the optical power, if the pigtails are unqualified, replace any of the 1-32 idle pigtails, remember: the main fiber of the splitter can not be pulled, which will affect all the ONUs.
Description of the ONU device panel indicator
Power Solid green light : The device power is on Off : The device is powered off
LOS light: off: The receiving light power of the PON port is normal;Solid green light: The device has completed discovery and registrationFlashing green: The device is not doing data;Not bright: The PON port has no light or the optical power is lower than the receiving sensitivity LAN 1, LAN 2, LAN 3, LAN 4 The fourth is the electrical port FXS1 is the voice port
Troubleshooting: First, see whether the ONU device is running normally (whether the device panel indicator is normal), and then find other reasons after the device is running normally, the procedure is the same as the above.