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PON PLANNING TOOL

PON Maximum Distance Calculator

Calculate optical-budget reach from equipment power window, fiber attenuation, splitters, splices, connectors and engineering margin. An editable system/protocol reach cap provides an effective planning distance.

Optical-budget reachSystem reach capPlanned link verificationLimiting-factor analysis
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Equipment, loss and planning parameters

Primary and secondary splitters default to 1:8 and can be edited.

Equipment power and reach limits
dBm
dBm
dBm
km
Edit according to OLT, ONU, ranging capability or planning rules.
km
dB
Fiber and fixed passive losses
dB/km
pcs
dB
pcs
dB
dB
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Distance and budget result

Effective maximum distance is the smaller of optical-budget reach and the system reach cap.

Effective maximum distance

0.00km
✓ Design passes
OPT
Optical maximum distance0.00 km
SYS
System reach cap0.00 km
PLAN
Planned link distance0.00 km
PON
Total split ratio1:64
Planned versus effective distance20.0 km
0 kmEffective reachScale maximum
Maximum channel loss0.00 dB
Fixed physical loss0.00 dB
Design loss available to fiber0.00 dB
Planned fiber loss0.00 dB
Planned physical loss0.00 dB
Planned design loss0.00 dB
Design budget remaining0.00 dB
Estimated receive power0.00 dBm

Fixed-loss breakdown

Splice loss0.00 dB
Connector loss0.00 dB
Splitter loss0.00 dB
Other passive loss0.00 dB
Engineering margin0.00 dB
Physical budget headroom0.00 dB
Primary limiting factor—
Engineering conclusion

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    METHODOLOGY

    Methodology and engineering notes

    Maximum channel loss

    Minimum transmit power minus receiver sensitivity. Use the worst-case values from the equipment specifications.

    Optical maximum distance

    Subtract fixed losses and engineering margin from the maximum channel loss, then divide by fiber attenuation per kilometer.

    Effective maximum distance

    Use the smaller of optical-budget maximum distance and the system or protocol reach cap.

    Planned link verification

    Check whether physical loss exceeds the equipment budget and whether the configured engineering margin is fully retained.

    Important note:PON deployment reach is not determined by optical power budget alone. OLT ranging, equipment configuration, protocol capability, differential distance and planning rules may also apply. The tool therefore displays optical-budget reach and effective system reach separately.

    FAQ

    Frequently asked questions

    Why can the optical budget reach 30 km while the result shows only 20 km?

    The effective distance is the smaller of optical-budget reach and the system reach cap. Even when optical power is sufficient, OLT ranging or network configuration may limit deployment.

    Why does a primary 1:8 and secondary 1:8 produce a total ratio of 1:64?

    The branch counts multiply, so 8 × 8 = 64. The losses are the sum of the actual insertion losses of the two splitters.

    Is optical-budget maximum distance the same as buildable distance?

    Not necessarily. Also verify the system reach cap, cable route, differential distance, equipment specifications and enterprise planning standards.

    What does "physical reach only" mean for the planned distance?

    Physical loss remains within the receiver-sensitivity budget, but the configured engineering margin is not fully retained, reducing long-term reliability.

    How much engineering margin should be configured?

    Set it according to enterprise standards and project conditions to cover ageing, temperature changes, maintenance connections, contamination and measurement variation.

    Can maximum-distance calculation replace OTDR testing?

    No. This tool supports design and review; field verification still requires a power meter, OTDR and actual equipment parameters.

    PROJECT RECORDS

    Recent calculations

    SOURCES & REVIEW

    Engineering references and scope

    Reviewed: 2026-08-31. This calculator combines optical loss, receiver sensitivity and a configured system reach cap; it does not prove protocol interoperability or field acceptance. The engineering margin is a planning input, not a universal standards mandate. Verify the installed fibre, splitter and equipment specifications with power-meter and OTDR tests.

    ENGINEERING WORKFLOW

    Continue the engineering workflow

    Current workflowOptical Link Design Workflow

    Build an optical link from physical loss assumptions through split planning, power budget and maximum reach verification.

    Step 4 of 4
    PreviousOptical Power Budget CalculatorVerify an optical link using transmit power, receiver sensitivity, optical penalty and ODN loss.
    NextWorkflow complete

    Related tools

    Optical Power Budget CalculatorVerify an optical link using transmit power, receiver sensitivity, optical penalty and ODN loss.PON Splitter Loss CalculatorPlan multi-stage splitting and calculate total ratio, insertion loss and effective reach.Fiber Loss CalculatorCalculate fiber, splice, connector, splitter and engineering losses for an optical link.