QSFP 40G SR4 Module for Multimode Links
The QSFP 40G SR4 module is a 40G multimode module for short-reach aggregation links, listed at 850nm with separate distances for OM3 and OM4 fibre. It carries four parallel lanes and supports breakout to four 10G links, which makes it a fit for 40G switches feeding 10G servers or for short multimode runs between racks.
What this module is listed as
The listed standard for this module is 40GBASE-SR4, with QSFP+ MSA and IEEE 802.3ba 40GBASE-SR4 stated on the source page. The module is a four-channel full-duplex design using a VCSEL array, with an unretimed XLPPI electrical interface and a single 3.3V power supply. Digital diagnostics are listed as supported. These are the listed figures for this model only; they are not a description of the whole QSFP range, and other QSFP models on this site carry different figures.
The optical figures are tied to multimode fibre at 850nm. OM3 fibre is listed at up to 100m and OM4 fibre at up to 150m, and the difference between the two grades is the reason the page lists both rather than a single distance. A buyer who does not know the installed fibre grade should find it out before ordering, because the same module reaches a different distance on each grade and a quotation built on the wrong grade will not match the installed link.
Connector conflict on the source pages - read before ordering
The source pages for this module disagree about the connector, and this page does not hide that disagreement. The title and feature text describe a single 1x12 MPO receptacle, while the specification table states a Double LC connector. Those two statements cannot both describe the same connector, so this page does not present either one as the confirmed connector for this model.
The practical consequence is simple: confirm the connector in writing in the enquiry before ordering, and name the mating connector on the installed fibre. Do not order on the assumption that one of the two source statements is the correct one, because the source pages themselves do not resolve the conflict and no further evidence was published to settle it. The specification table below records the conflict in its own row so that it cannot be missed.
Where this module fits
The listed applications for this module are 40GBASE-SR4 40G Ethernet, breakout to four 10GBASE-SR Ethernet links, and proprietary interconnections. The breakout use is the distinctive one: a single 40G port can feed four 10G endpoints through a breakout cable assembly, which suits top-of-rack designs where a 40G aggregation switch serves 10G servers. The breakout cable itself is a separate item and is not specified on this page.
The commercial operating case temperature is listed as 0 degrees Celsius to 70 degrees Celsius, which covers ordinary indoor data center and wiring-closet conditions. Links in unconditioned spaces or outdoor enclosures fall outside that listed range and should be raised in the enquiry, because the listed figure does not extend to them.
Specification - as listed for this model
| Item | Listed value |
|---|---|
| Model | QSFP-40G-SR4 |
| Rate and standard | 40G, 40GBASE-SR4; QSFP+ MSA; IEEE 802.3ba 40GBASE-SR4 |
| Wavelength and fibre | 850nm, multimode fibre (MMF) |
| Distance | OM3 up to 100m; OM4 up to 150m |
| Connector - source pages disagree | Title and feature text state a single 1x12 MPO receptacle; the specification table states Double LC Connector. Confirm per model before ordering - neither value is presented here as the confirmed connector. |
| Transmit power | -7.6 to +1.0 dBm |
| Receive sensitivity | -11.100 to +2.4 dBm |
| Extinction ratio | 3.5 dB |
| Power consumption | 1.2W (feature text states maximum power dissipation below 1.2W) |
| Power supply | Single 3.3V |
| Electrical interface | Unretimed XLPPI |
| Laser technology | VCSEL array (as stated on the source page) |
| Digital diagnostics | Yes (DDM) |
| Operating case temperature | 0 to 70 degrees Celsius (commercial) |
| Compliance statement | RoHS Directive 2011/65/EU compliant (as stated on the source page) |
Values above are taken from the listed specification for this model only. They are not a range-wide promise. Items not listed here are confirmed per model in the enquiry, and any conflict inside the source pages is flagged on the page rather than resolved by choosing one value.
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
Which connector does this module actually use?
The source pages disagree: the title and feature text state a single 1x12 MPO receptacle, while the specification table states a Double LC connector. This page records both statements and asks buyers to confirm the connector per model in the enquiry, rather than presenting one of them as fact.
What distance will I get on my fibre?
That depends on the fibre grade. OM3 is listed at up to 100m and OM4 at up to 150m for this module at 850nm. Name the installed fibre grade in the enquiry so the distance can be confirmed against that grade.
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.