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Estimate optical link loss, remaining margin, splitter loss, two-stage FTTH ODN loss, maximum reach and pass / warning / fail status for fiber optic cable, patch cord, pigtail, adapter, attenuator, MPO/MTP, PLC splitter and FTTH network planning.
| Item | Default Planning Value | Engineering Note |
|---|---|---|
| OS2 attenuation | 0.35 dB/km @ 1310 nm, 0.22 dB/km @ 1550 nm | Suitable for common single mode link estimation. Use project cable datasheet values for final design. |
| OM3 / OM4 / OM5 attenuation | 3.0 dB/km @ 850 nm, 1.0 dB/km @ 1310 nm | For multimode data center links, actual reach may also be limited by modal bandwidth and dispersion. |
| Connector pair | 0.20 / 0.35 / 0.50 dB | Select low-loss value for premium patch cords, dense patching or high-speed optical links. |
| MPO / MTP connection | 0.25 / 0.35 / 0.75 dB | Low-loss MPO is recommended for 40G / 100G / 400G high-density links. |
| PLC splitter | 1:4 = 7.4 dB, 1:8 = 10.7 dB, 1:16 = 13.9 dB, 1:32 = 17.2 dB, 1:64 = 20.8 dB | Conservative planning values for RFQ pre-check. ZION splitter typical IL may be lower — confirm with datasheet, splitter uniformity and project acceptance rules. |
| Status | Margin Condition | Engineering Meaning | Recommended Action |
|---|---|---|---|
| Pass | Remaining margin ≥ engineering reserve | The link has enough optical budget based on the current assumptions. | Confirm final connector grade, splitter grade and test report before ordering. |
| Warning | Remaining margin is positive but below reserve | The link may work, but field variation, dirty connectors or future patching may create risk. | Use low-loss connectors, reduce connector count, check splitter design or increase optical budget. |
| Fail | Remaining margin < 0 dB | The estimated link loss is higher than the available optical budget. | Reduce split ratio, use higher PON class, shorten distance or redesign the ODN. |
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