SPAN CONTEXT · NOT A ROUTE MAP
wholesale dwdm sfp 10g 80km
Wholesale dwdm sfp 10g 80km only becomes a purchase when the span is named. A metro regeneration segment, a campus handoff, and a data-hall cross-connect ask for different fiber, different loss, and often a different module. This desk coordinates the questions. It does not design the route and it does not operate the wavelengths.
Write the application first: what the host is, how long the fiber is, what the mux already passes, and which documents the site will accept at incoming inspection. Then the factory replies can be compared. A channel plan copied from another city is not your plant.
Application lines that should not share a price cell
Metro span near 80 km
Use this line when the outside fiber is single-mode and the target class is about 80 km. Record span loss if a technician has measured it. If not, a planning check is 0.22 dB/km times the route kilometers, plus mux insertion loss. Chromatic dispersion near 17 ps/nm/km can reach roughly 1360 ps/nm at 80 km. Optical budget is minimum transmit power minus receiver sensitivity, both in dBm. Ask whether the quoted module tolerates the dispersion figure or expects a compensator you must buy separately. Delivery stages matter: factory ship, customs into the US destination, then your cage turn-up. A ship date is not a lit wavelength.
Data-hall and campus handoff
Many halls run multimode at 850 nm for a few hundred meters, or short-reach single-mode grey optics, not a colored 80 km DWDM part. Putting an OM4 10G SR module in the same wholesale cell as a C-band 80 km module hides a plant mismatch. If the handoff is only between two cages in one room, say the meters and the connector. An 80 km optical budget on a 40 meter jumper is an unused specification, and the temperature window may still matter if the cage is hot.
Legacy chassis fill
A platform that is out of ordinary product life may push the buyer toward a refurbished module or a compatible EEPROM code. Treat new and refurbished as separate columns: case condition, warranty months, any DOM hour reading the seller will share, and whether the identification bytes were rewritten. Compatible coding can widen the factories you ask, and it can also void a host-vendor support policy. OEM coding can track that policy more closely and can narrow supply. This desk does not score either side. It asks the supplier to name which one the quote is.
Site constraints to attach: rack unit space is usually irrelevant for an SFP+ itself, but the host chassis power feed, the airflow, and the allowed connector mating cycles for test jumpers are not. Ingress protection applies if a patch panel sits in an outdoor cabinet. None of those ratings are results from this desk.
Open the inquiry labels or send the span description through the RFQ form.
Evidence the site should demand for the exact module
Datasheet bound to the model
Request the current sheet for the manufacturer and model in the quotation, with wavelength, Tx/Rx levels in dBm, dispersion tolerance, temperature, and DOM. A product-family page that lists “10G DWDM” without the channel table does not identify the part in the carton.
What the standard page does not do
The ITU optical-fibre recommendation index, reviewed as a public page on 2026-10-27, is a place to find terminology. It is not a certificate for the module, and it is not a substitute for the revision of the recommendation your engineer actually uses. IEEE Ethernet overviews likewise do not prove that two transceivers interoperate. Ask for the test the supplier will show, and for the host it was run on, if any test is offered.
Compliance stays on the model
If the buyer needs an FCC authorization file, an NRTL safety file, or a supplier ISO 9001 certificate, name the document and ask for the certificate number tied to the legal manufacturer of that model. A certificate for a different factory, or for a cable assembly, does not travel with the SFP+. This site does not issue those files.
Limitation of an 80 km label
The label ignores your connector loss, your mux, your repair splices, and the penalty at the dispersion limit. A module can meet a datasheet reach on a reference fiber and still fail your span. That is a reason to compare optical budgets, not a reason to publish a savings figure this desk has not calculated from two real quotations.
Review the span before you accept an alternate channel
An alternate is acceptable only when the mux passes it, the host code is unchanged or explicitly re-approved, and the optical budget still clears the measured or estimated loss. Write the rejection rule in the brief so factories do not “improve” the wavelength.
- Keep 850 nm multimode offers in a different column.
- Keep refurbished pulls off the new-module average.
- Keep compensators and mux ports as their own prices.