40G Ethernet Transceivers for Aggregation Links
40G Ethernet transceivers serve aggregation links between distribution and core layers, and they serve breakout designs where one 40G port feeds four 10G endpoints. This application page gathers the 40G line supplied here, anchored on the 40G multimode QSFP module with its listed specification.
What this page covers
This page is a application page for 40G Ethernet transceivers. It gathers the models and guidance that belong to this line in one place, and it links to the individual product pages where a model has a listed specification. Lines that have only a title-level mention, with no detailed specification behind them, are described here at category level only and are not given a product page, because a product page without a listed specification would be guessing.
The distinction matters for buying. A category page answers which line a need belongs to and what to ask about; a product page answers the listed figures for one model. If you arrive here looking for a figure for a specific model, follow the link to that model page, and if no model page is linked, the figure is not published on this site and should be asked for in the enquiry rather than inferred from a neighbouring model.
How to specify this line
A usable enquiry for 40G Ethernet transceivers starts with the rate, the wavelength, the fibre type and the distance, because those four items decide whether a module fits the link at all. The connector and the form factor come next, followed by the operating temperature range and whether digital diagnostics are required. Buyers who send only a rate, or only a model-style name, usually need a second round of questions before a quotation can be confirmed, so including the full set in the first message saves a cycle.
Distance figures deserve special care. A distance quoted for one fibre type does not transfer to another, and a distance quoted for one wavelength does not transfer to a different wavelength. On this site every distance is tied to the fibre and wavelength it was listed with, and where the source pages disagree the conflict is flagged on the page. If a distance matters for your link, name the fibre you will actually install and ask for the figure to be confirmed against that fibre before ordering.
What to confirm before ordering
Before an order is placed, confirm the model, the rate, the wavelength, the distance, the connector and the quantity in writing, and confirm any certification document you need by name. Minimum order quantity and lead time are unavailable at company level on this site, so ask for both per model in the enquiry rather than assuming a company-wide term. Quotations are confirmed per order, and specifications are confirmed per model before payment.
Compatibility is a separate check from the optical figures. A module that matches on rate and wavelength can still fail on a host platform that does not accept it, so name the host platform in the enquiry when compatibility matters. Where this site states a compatibility position, it states the source of that position, and it does not extend a compatibility statement from one model to another. If the platform is not named, compatibility cannot be confirmed from this page alone.
The 40G module behind this page
The 40G product page behind this application page is the QSFP 40G SR4 multimode module, listed at 850nm with OM3 fibre at up to 100m and OM4 fibre at up to 150m, and with breakout to four 10GBASE-SR links listed as an application. The breakout use is the one that most affects ordering: a breakout design needs the breakout cable assembly as well as the module, and the cable assembly is a separate item that is not specified on the product page.
The connector conflict flagged on the product page applies here too. The source pages disagree between an MPO receptacle and a Double LC connector, and this site does not present either as confirmed. A 40G order, whether for a straight 40G link or a breakout design, should confirm the connector in writing in the enquiry, because the connector decides which cable assembly the link needs.
Models on this page
QSFP 40G SR4 Module
40G multimode module at 850nm, OM3 100m and OM4 150m.
Enquiry checklist
Before sending an enquiry, note the model or the rate you need, the wavelength, the fibre type, the distance, the connector, the quantity and the application. State whether the module must be compatible with a named host platform, and name any certification document you need. Minimum order quantity and lead time are unavailable at company level and are confirmed per model in the enquiry. Quotations are confirmed per order.
Send an enquiry | Sales contact: Ms. Vicky Tian, Sales Manager, +86 19860146913 | Telephone: 86-0755-82552969 | Email: dsale@topsfp.com
Frequently asked questions
How do I get a quotation?
Send an enquiry naming the model, the rate, the wavelength, the distance and the quantity you need, plus the application. Quotations are confirmed per order, and specifications are confirmed per model before payment. This site does not list fixed selling figures, and no price is shown for any model.
What certification documents can you provide?
The company states ISO 9001, CE, FC, 3C and RoHS names. Certificates are available upon request. If a buyer needs a certificate for a specific model, name the model in the enquiry so the correct document can be checked. No certificate numbers are published on this site.
Do the specifications on one page apply to the whole range?
No. Specifications are shown per model and must not be read across the whole range. Where a value is not listed for a model, the page says to confirm per model rather than filling in a generic figure, and where the source pages disagree, the page flags the conflict instead of choosing one value as fact.
What are the minimum order quantity and lead time?
At company level both are unavailable on this site and are confirmed per model in the enquiry. A single-model note, where one exists, is marked as applying to that model only and must not be read as a company-wide term.