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Compare factory quotations on the same GPON OLT configuration.
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Compact specification handoff
An optical SFP GPON OLT line is a module decision, not a chassis slogan. Write wavelength, optical budget, diagnostics, temperature, and the host the cage must boot. LinkScope Sourcing 10 coordinates the questions. It does not code the EEPROM and it does not stock transceivers.
Ask whether the datasheet centers are 1490 nm downstream and 1310 nm upstream. A 1550 nm video overlay is a third wavelength if the plant still uses it. ITU-T G.984.2, first issued in 2003, is the reference buyers cite. The recommendation does not certify the module offered in 2026.
Class B+ is a 28 dB minimum optical budget. Class C+ is 32 dB. Request transmit power and receiver sensitivity for the exact part number, not a family brochure. A 2.488 Gbit/s downstream rate and a 1.244 Gbit/s upstream rate describe the PON, not the cage vendor.
State whether digital diagnostics must report optical power, temperature, and bias. Host compatibility means the named OLT software brings this SFP up. A matching latch color is not that test. Connector polish, SC/APC versus SC/UPC, sets the return-loss class the plant expects.
Selection table for the handoff, without naming outside brands. Compare fixed optics against a removable optical SFP, then compare an OEM-coded module against a compatible module. Fixed optics can simplify a 2-port pizza box and block a later wavelength change. A removable SFP lets the buyer swap a failed port and adds an EEPROM risk. OEM coding may track the chassis vendor support policy. A compatible part may widen supply when the exact host is tested. Neither column is a ranking from this desk.
| Open choice | What to verify | What an alternative must repeat |
|---|---|---|
| Commercial versus industrial temperature | 0 C to 70 C is a common commercial window. An outdoor cabinet may need a range that includes -40 C. | The same min and max, on the exact part number. |
| DOM on versus DOM off | Operators who alarm on low receive power need diagnostics. A dark module hides that level. | The same diagnostic set, or a written waiver. |
| New module versus pulled stock | New 2026 stock can carry a current label and a stated handling history. Pulled stock needs condition and remaining life in writing. | The same wavelength, class, and host test, plus the condition words. |
Worked handoff, not a customer quote: a 2026 campus buyer has an 8-port OLT with two cages empty. Background is a 1:32 splitter and a 15 km feeder. Process is to compute 15 times 0.35 dB/km, about 5.3 dB, plus splitter loss near 17 dB, then ask whether a Class B+ 28 dB SFP still clears. Result the buyer should keep is the factory optical sheet for that part number, or a written deviation. LinkScope Sourcing 10 does not meter the port.
How a buyer can re-check a factory sheet: read transmit power, receiver sensitivity, wavelength, and the temperature at which those figures apply. An OTDR of the feeder is the plant side of the same review. Sample testing at a factory bench is useful when the report names the part number, the wavelength, and the date in 2026 or whenever the test ran. This site has no lab of its own.
Limits on the handoff. A datasheet budget is not the ODN loss. An SFP that fits the cage mechanically can still fail host software. Return loss and insertion loss of the patch cord are not properties of the OLT price. Reach in kilometers without a loss sheet is an incomplete answer. FCC equipment authorization, if the device needs it, must name the exact model. An ISO 9001 plant certificate does not replace that file.
Use the box for wavelength, class, host platform, quantity, and destination. Option names sit on the catalog. The same fields are on the requirement desk.