SFP vs SFP+ vs QSFP28: How to Choose Compatible Optical Transceivers for Huawei and Ruijie Switches

Most transceiver problems on site are not caused by a “bad module”. They usually come from a mismatch somewhere in the chain: the port speed, the form factor, the fiber type, the reach, the connector, or the way the switch treats a module that is not its own brand. This guide walks through those checks in the order we find most practical, and ends with a checklist you can paste into an RFQ.

Short answer: match the port first (SFP / SFP+ / SFP28 / QSFP+ / QSFP28), then the link (multimode or single-mode, wavelength, distance, connector), then decide between original-brand or third-party compatible modules based on your switch model, software version and support terms. When in doubt, test one sample on the exact switch before ordering in volume.

1. Form factors at a glance

The name on the cage tells you the physical size and the speed class. The table below shows the common classes and examples that are listed in the ICTSpares catalog.

You can browse the full range in optical transceivers and high-speed cables.

2. Port compatibility: what usually works, and what to confirm

The SFP family (SFP, SFP+, SFP28) shares the same physical size, and the QSFP family (QSFP+, QSFP28) shares another. Same size does not always mean the combination works:

• A slower module in a faster port (for example SFP+ in an SFP28 port, or QSFP+ in a QSFP28 port) is supported on many platforms, but not on every port or every software version. Check the hardware guide of your switch model.
• A faster module in a slower port (for example SFP+ in a 1G-only SFP port) generally will not run at the higher speed. Some ports may not bring the link up at all.
• Port speed settings sometimes have to be set manually when the two ends are different speed classes.
• Breakout (one QSFP port split into several lower-speed links) depends on the switch model and needs matching cables or modules on the other end.

The safest reference is the transceiver compatibility list or hardware guide published by the switch vendor for your exact model.

3. Match the link: fiber, wavelength, reach and connector

Once the port is right, the optical side has to match both ends of the link.

Some examples from catalog listings, using the parameters stated on each listing:

• Huawei SFP-10G-LR: SFP+, single-mode, 1310 nm, 10 km, LC.
• Huawei QSFP28-100G-SR4: QSFP28, multimode, 850 nm, 0.1 km, MPO.
• 10Gtek AMQ28-SR4-M1: QSFP28 SR4, listed at 70 m on OM3, MPO/MTP.
• HAILE SFP-2GE10-SM1310-A/B: a single-fiber pair, so one A and one B module are needed for one link.
• Huawei SFP-10GBaseT and 10Gtek ASF-10G-T: SFP+ to RJ45 copper, listed at 30 m.

4. Short links: DAC, AOC or optics?

For links inside a rack or between neighbouring racks, a cable assembly is often simpler than two modules and two patch cords.

Catalog examples: the Huawei SFP-10G-CU1M 1 m stacking cable, the HAILE DAC-10G-1M SFP+ DAC, and the 10Gtek AOC-S1S1 SFP+ AOC. Stacking ports in particular may expect a specific cable type, so check the stacking section of the switch guide.

5. Original-brand vs third-party “compatible” modules

A listing that says “compatible with Huawei” or “compatible with Ruijie” usually means the module follows the same MSA standard and has been coded (its EEPROM vendor fields programmed) for that platform. In practice:

• Switch behavior differs. Depending on the model and software version, a switch may accept a third-party module silently, show a warning or alarm, or limit some functions. Behavior can change after a software upgrade.
• Coding matters. If you order compatible modules, state the target brand and, where possible, the switch model so the module can be coded for it.
• DDM / DOM. Digital diagnostics (temperature, voltage, optical power) are very useful for troubleshooting. Check that the listing mentions DDM or DOM if you rely on it.
• Support terms. Some vendor support agreements have specific rules about third-party optics. Check your own contract before mixing.
• Test first. For a new switch model or software version, order a sample and confirm link-up, speed and diagnostics before a volume order.

Original-brand modules such as those on the Huawei and Ruijie brand pages remove the coding question. Third-party compatible lines such as HAILE and 10Gtek are another option where the platform and support terms allow it. Neither choice is right for every project.

6. RFQ checklist for transceivers

Sending these details in one message avoids most back-and-forth:

1. Switch brand, model and, if known, software version.
2. Port type and speed (SFP, SFP+, SFP28, QSFP+, QSFP28).
3. Link distance and fiber type (multimode OM3/OM4 or single-mode), or copper.
4. Connector at the patch panel (LC, MPO/MTP, SC) and whether the link is duplex or BiDi.
5. Original-brand or compatible, and the target coding if compatible.
6. Whether you need DDM/DOM and any temperature range requirement (for example for industrial or outdoor cabinets).
7. Quantity, delivery country and required date.

You can send this list through the RFQ form or the contact page. Price, stock and lead time are confirmed per inquiry.

FAQ

Can I use an SFP+ module in an SFP28 port?

Often yes, at 10G, but it depends on the switch model, the port and the software version. Check the hardware guide or compatibility list for your model, and set the port speed manually if the link does not come up.

Is a QSFP28 port backward compatible with QSFP+?

Many QSFP28 ports accept QSFP+ modules at 40G, but support is platform-specific. Confirm with the vendor documentation for your exact switch before ordering.

Are third-party compatible optics safe for Huawei or Ruijie switches?

They can work well when they are coded for the platform and tested on the actual switch, but behavior varies by model and software version, and some support contracts have rules about them. Testing a sample first is the most reliable approach.

What is the difference between DAC and AOC?

A DAC is a copper twinax cable with fixed ends for very short links. An AOC uses fiber with fixed optical ends, so it is lighter and can run longer. Both replace two modules plus a patch cord.

What information do you need to quote a transceiver?

The switch model, port type, link distance, fiber type, connector, original or compatible preference, DDM needs, quantity and delivery country. See the checklist above.

ICTSpares is an independent B2B catalog and is not an official Huawei, Ruijie, HAILE or 10Gtek store. Brand names are used to identify products and compatibility for RFQ purposes. Product parameters above are taken from the individual catalog listings; please confirm the final specification with us before ordering.