Lane plan
A substitute that changes four NRZ lanes into one PAM4 wavelength is not a drop-in because the connector and the FEC moved. Reject the substitute unless the buyer rewrites the fiber and host rows and the supplier answers them again.
BUYER CHECKLIST
100g optical transceiver wholesale
Use this 100g optical transceiver wholesale checklist before a brief leaves the buying team. Each row is a field to fill, a field to mark unknown, or a document to request. Nothing on the console is a stock position or a factory approval.
Ledger of fields and the evidence that should travel with them
Keep the ledger attached to one proposed model. A second model needs a second column. The route notes explain how SR4 and LR4 names diverge. The procurement brief carries the same evidence idea into a longer note.
| Field | Buyer entry | Evidence to request |
|---|---|---|
| Interface | QSFP28, SFP28, QSFP-DD, or the cage actually installed | Mechanical drawing or MSA form-factor statement for that model |
| Data rate | 100 Gbit/s aggregate, and per-lane rate | Datasheet line that says NRZ 4 x 25 Gbit/s or PAM4 single-lambda |
| Wavelength | 850 nm, 1310 nm, 1550 nm, or the LAN-WDM set | Center wavelength and tolerance at the stated case temperature |
| Fiber and connector | OM3, OM4, G.652.D, G.657.A1, LC, or MPO-12 | Plant record plus the module connector callout |
| Reach class | Designed meters or kilometers, not a slogan | Datasheet reach with the fiber designation it assumes |
| Optical budget | Tx minimum, receiver sensitivity, connector loss, fiber loss | The two optical numbers with units in dBm and the test pattern |
| Diagnostics | Temperature, voltage, bias, Tx power, Rx power, per lane or not | Register map or digital-diagnostic statement for that firmware |
| Host | Platform, software release, coded or generic EEPROM | Host list the supplier will stand behind, with the release named |
| Environment | 0 °C to 70 °C or -40 °C to 85 °C, and the room type | Case-temperature rating on the same datasheet revision |
| Commercial | Quantity, US destination, timing, currency, per-module or order basis | Quotation lines that repeat those words rather than a single unit price |
Open choices to close before you accept a substitute
Power window
If the substitute datasheet shows a smaller gap between transmit power minimum and receiver sensitivity, recompute the budget with the same connector count. A module with a stronger typical transmit power can still fail when the minimum, which is the number the budget should use, is weaker.
Identity and support
A substitute with a different EEPROM story can pass an optical meter and still be refused by the host. Ask for the behavior on code mismatch before the lot is accepted. Warranty months and return freight have to be restated. They do not carry over from the previous model.
Paper that is not evidence
A family brochure, a photo of a similar bail latch, and a standards title without the model revision are context. They do not prove insertion loss, return loss of the optical port, or compliance. Laser-class and equipment-authorization files, when they apply, must name the model. This checklist does not certify them.
Hand the checklist to the RFQ
There is no file upload on this desk. After the form is submitted, the coordinator can tell you where to send a polarity drawing or a host part number. Write the open rows into the requirement field so the message stands on its own if the drawing arrives later.