Lock the topology
Identify the OLT side, splitter stages and locations, feeder, distribution and drop lengths, terminal point, and subscriber equipment.
FTTH / PON working tool
See where the optical budget is being used.
Enter project and model-specific values for the passive path. The calculator keeps splitter, fiber, connector, splice, other loss, and design reserve visible instead of hiding them inside one total.
Editable project inputs
Build the loss path from the equipment budget backward.
Use the available optical budget from the selected equipment and loss values from the exact cable, splitter, connector, splice, and enclosure plan. Blank fields are calculated as zero.
Working result
Enter the equipment budget
This is a design worksheet, not a compliance certificate or a measured acceptance result.
- Fiber loss
- 0.00 dB
- Splitter loss
- 0.00 dB
- Connector loss
- 0.00 dB
- Splice loss
- 0.00 dB
- Other loss
- 0.00 dB
- Total path loss
- 0.00 dB
- Remaining before reserve
- 0.00 dB
- Remaining after reserve
- —
Use the result carefully
Arithmetic is only one part of the path review.
Use exact components
Take loss values from the selected cable, PLC splitter, adapter, connector, pigtail, splice plan, and approved design basis.
Keep reserve visible
Do not bury aging, repair, environmental, measurement, or project reserve inside a component value. Record the required reserve as its own line.
Measure the installed path
Keep the calculated design record and the field acceptance record separate so deviations can be located and reviewed.
Review questions
Before treating the number as usable.
Which optical budget should be entered?
Use the available budget stated for the exact equipment combination and operating plan. Keep transmitter, receiver, wavelength, class, and any project derating visible in the design record.
Should measured splice loss replace the design allowance?
Keep design and measured values separate. Use the approved design allowance during planning, then record measured results in the installation and acceptance documents without erasing the original basis.
Does a positive result approve the network?
No. It only shows that the entered arithmetic leaves the entered reserve. Equipment compatibility, wavelength, topology, splitter data, reflectance, connector condition, installation, testing, and the project acceptance basis still require review.
Continue the FTTH review