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- Turn-up tests
FTTH Knowledge
- Solving the FTTH Rollout Problem in Multiple Dwelling Units
- WDM PON Introduction FAQ
- A Simple Overview of Optical Power Meter
- ODN is based on PON FTTH Optical Cable Network of the Device
- Using an OTDR to be an Expert in Fiber Link Testing
- How FTTH Broadband Works?
- Connections among Fiber Terminal Boxes & Patch Cables & Pigtails
- Easy to Install a Fiber Terminal Box
- What is Arrayed Waveguide Grating?
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Performance Feature
FTTH Knowledge
Recommended
Turn-up tests
After acceptance testing, the optical network terminals (ONTs) can be installed in the customer premises. With PON technology, an ONT’s 1310nm wavelength is activated only by the 1490nm signal from the OLT. Therefore, to measure the output power of all wavelengths, the OLT and ONT must be connected. A power meter with two ports, called a selective through-mode power meter, is used to connect the fibers coming from the OLT and the ONT at the same time so testers can perform tests from the ONT.
If the tests show that some but not all ONTs are working, the problem is either in the distribution network or the ONTs. In this case, “in-service” OTDR at 1625nm or 1650nm can locate the fault without disturbing the working customers.
Optical Distribution Network
On the other hand, when all ONTs are out of service, the technician should check the OLT to verify whether it is transmitting the correct power levels. If it is not, the OLT should be replaced. If the OLT is transmitting correctly, there is an outage in the fiber network. Testers should perform an OTDR measurement (1310nm/1550nm) from the OLT connection toward the Fiber Distribution Hub (FDH) to locate a possible break or bend in the feeder.