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This video shows an example of a QSFP-DD ER4 transceiver in action:
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Customized QSFP28 100GBASE-ER4 100G Transceiver ...
FS.com
https://www.fs.com › ... › 10/25/40/100G Custom
FS.com
https://www.fs.com › ... › 10/25/40/100G Custom
The 100GBASE-ER4L QSFP28 transceiver supports 100GBASE Ethernet links up to 40km over single-mode fiber using duplex LC connectors.Read more
$1,599.00Free 30-day returns
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Are QSFP28 and QSFP+ compatible?
This similarity in form factor allows for backward compatibility, as QSFP28 ports can accept QSFP+ modules, although at a reduced data rate.
What is the QSFP, QSFP+, QSFP28, QSFP-DD？Different of ... - Sopto
Sopto
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What is the difference between QSFP28 and QSFP+?
This video explains the core differences between QSFP+ and QSFP28 transceivers:
QSFPTEK
YouTube · Nov 5, 2022
Key Differences at a Glance
Feature | QSFP+ | QSFP28 |
|---|---|---|
Max Data Rate | 40 Gbps | 100 Gbps |
Lane Configuration | 4 lanes x 10 Gbps | 4 lanes x 25 Gbps |
Primary Use | 40G Ethernet, enterprise networks | 100G data centers, 5G |
Form Factor | Same physical size as QSFP28 | Same physical size as QSFP+ |
Compatibility | QSFP28 ports can usually accept QSFP+ | QSFP+ ports cannot accept QSFP28 |
Key Takeaways
- Speed & Bandwidth:QSFP28 offers significantly higher bandwidth (100G vs. 40G) for modern data-intensive applications, while QSFP+ is a legacy standard for 40G.
- Form Factor:They are physically interchangeable in ports, allowing for graceful upgrades.
- Flexibility (QSFP28):A QSFP28 transceiver can also be used for 4x25G, 2x50G, or even 1x100G links, depending on the specific module and application.
- Power:QSFP28 generally consumes more power due to its higher speeds.
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Difference Between QSFP, QSFP+, QSFP28 | by Monica Geller - Medium
Apr 17, 2017 — QSFP+ vs QSFP28. QSFP+ and QSFP28 differs in “28” as the name says. QSFP28 is a hot-pluggable transceiver module desig...
Medium ·
Monica Geller
QSFP+ vs. QSFP28 Transceivers: The Breakdown - AddOn Networks
May 18, 2021 — On the other hand, QSFP28 is an upgraded version of QSFP+. They even have almost identical form factors which allows Q...
AddOn Networks
What is the QSFP, QSFP+, QSFP28, QSFP-DD？Different of ... - Sopto
Data Rate : The main difference between QSFP+ and QSFP28 lies in the data rate they support. QSFP+ (Quad Small Form-factor Pluggab...
Sopto
UNDERSTANDING THE DIFFERENCES BETWEEN QSFP+ ...
Jun 8, 2022 — QSFP+ (4x10Gbps Quad Small Form-Factor Pluggable) and QSFP28 (4x25Gbps Quad Small Form-Factor Pluggable28) are two QSFP...
Westbury Photonics
QSFP+ vs QSFP28 : Fiber-Mart.com
Nov 26, 2025 — Data Rate and Bandwidth Capacity The most significant distinction in QSFP+ vs QSFP28 lies in their data rate capabilit...
Fiber-Mart.com
QSFP28 vs. QSFP+: Understanding the Speed and Density Difference
Nov 7, 2025 — QSFP+ Speed: Catering to 40Gbps Needs QSFP+ is specifically designed for 40Gbps data transmission. Its four independent...
Fiber-Mart.com
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Will SFP+ work in SFP28?
Yes, SFP28 ports are generally backward compatible with SFP+ transceivers, meaning you can plug an SFP+ module into an SFP28 port and get a 10Gbps connection, but you cannot typically plug a 25G SFP28 transceiver into an older SFP+ port and get 25Gbps; it usually won't work or will require specific port configuration for 10G operation. SFP28 is an evolution, so the newer SFP28 ports are designed to support the older SFP+ speeds, but older SFP+ ports lack the native capability for 25G speeds, according to QSFPTEK and Optcore.
Key Compatibility Rules:
- SFP+ in SFP28 Port (Yes):An SFP+ module works in an SFP28 port, but the link speed will be limited to 10Gbps.
- SFP28 in SFP+ Port (Usually No):An SFP28 module usually won't work in a standard SFP+ port unless the SFP+ port's firmware/OS can be configured to operate at 10Gbps (sometimes with a specific 10G/25G dual-rate SFP28 module), notes Optcore and AMD.
Important Considerations:
- Physical Form Factor: SFP+ and SFP28 have the same physical size, allowing for easy swapping.
- Auto-Negotiation: SFP28 ports often auto-detect the slower SFP+ module and adjust speed, but vendor-specific features or compatibility matrices should be checked.
- Dual-Rate Modules: For smooth upgrades, using a 10G/25G dual-rate SFP28 transceiver is ideal, as it functions as either.
In summary, SFP28 is the more capable standard, offering backward compatibility with SFP+, but the reverse isn't automatically true without specific port configuration.
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Is SFP28 Compatible with SFP+? - EDGE Optical Solutions
Dec 12, 2022 — In many cases, SFP+ modules can be inserted into SFP28 ports due to their identical physical form factors. Most SFP28 ...
EDGE Optical Solutions
Can I use SFP+ transceivers on SFP28 ports? | QNAP
Oct 11, 2023
QNAP
SFP28 vs SFP+ Transceiver, What is the Difference? - Optcore
Jun 26, 2024 — Q: Can I use SFP28 transceivers in SFP+ ports? A: The answer is yes, because SFP28 is backward compatible with SFP+ po...
Optcore
SFP SFP+ SFP28 and Why You Need DAC in Your Rack!
Aug 6, 2021 — plus 10 gig SFP 28 25 gig okay I didn't name it. but right here 25 gig is SFP 28 physically the same. here. something c...
YouTube ·
Lawrence Systems
SFP vs SFP+ and SFP28 vs SFP+ and QSFP28 vs QSFP+ ...
Jun 7, 2022 — SFP28 vs SFP+ Compatibility Is SFP28 compatible with SFP+? Yes, the SFP28 port does take the SFP+ port but not vice ver...
QSFPTEK
SFP+ to SFP28 converter - Adaptive Support - AMD
Jul 26, 2020 — Thanks and Regards, Ronston. nanz (AMD) Edited by User1632152476299482873 September 25, 2021 at 3:10 PM. Hi @aminsut1n...
AMD
10G SFP+ to 25G SFP28 or 10G SFP+ to 40G QSFP, which one to choose? - AscentOptics Blog
Jun 25, 2023 — Yes, 25G SFP28 transceivers are backward compatible with SFP+ ports. 25G SFP28 has a similar form factor to 10G SFP+,
AscentOptics
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Is it QSFP or QSFP+?
QSFP+ is the modern incarnation of QSFP. In most data centers, it has completely replaced its predecessor. QSFP+ can reach speeds of 10 Gbps per line. This makes it a 40G connection type that still maintains the small form factor that is essential to so many network designs.
What are the differences between SFP, SFP+, QSFP and QSFP+?
CablesAndKits
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100GBASE-ER4 QSFP28 SMF 1295-1309nm 40km DDM ...
Approved Networks
https://approvednetworks.com › ... › 100GB QSFP28 ER
Approved Networks
https://approvednetworks.com › ... › 100GB QSFP28 ER
The Approved Networks 100GBASE-ER4 QSFP28 SMF 1295-1309nm 40km DDM Transceiver is guaranteed 100% Compatible and Functional in its intended router or switch.Read more
JNP-QSFP-100G-ER4-C | Juniper Networks® | Transceivers
ProLabs
https://www.prolabs.com › juniper-networks › qsfp28 › j...
ProLabs
https://www.prolabs.com › juniper-networks › qsfp28 › j...
This Juniper Networks® JNP-QSFP-100G-ER4 compatible QSFP28 transceiver provides 100GBase-ER4 throughput up to 40km over single-mode fiber (SMF) using a ...
PRE-QSFP28-ER4(I)
Precision Optical Technologies
https://www.precisionot.com › product › pre-qsfp28-er4
Precision Optical Technologies
https://www.precisionot.com › product › pre-qsfp28-er4
Long-Distance Connectivity: The QSFP28-ER4(I) supports transmission distances of up to 40 km over single-mode fiber, ideal for extended-reach applications.Read more
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QSFP-100G-ER4 100GBASE-ER4 QSFP28 Transceiver ...
QSFPTEK
https://www.qsfptek.com › product
QSFPTEK
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Generic QSFP-100G-ER4 100GBASE-ER4 QSFP28 optical transceiver provides 100Gbe links up to 40km over OS2 at 1310nm using LC Duplex interface.
$1,043.90In stockFree delivery30-day returns
40G QSFP+ ER4 DML CWDM4 40km Optical Transceiver
GIGALIGHT
https://www.gigalight.com › 40g-qsfp-er4
GIGALIGHT
https://www.gigalight.com › 40g-qsfp-er4
GIGALIGHT 40G QSFP+ ER4 optical transceiver module is designed for long-distance interconnections in data centers.Read more
Axiom QSFP-100G-ER4-S-AX | Compatible with Cisco
Axiom Memory Solutions
https://www.axiomupgrades.com › productdetail › qsfp-...
Axiom Memory Solutions
https://www.axiomupgrades.com › productdetail › qsfp-...
Axiom QSFP28 100Gb Transceiver Modules are 100% compatible in all OEM applications. They are pre-configured with an application specific code to meet the ...Read more
QINIYEK 40GBASE-ER4 QSFP+ Module LC SingleMode ...
Amazon.com
https://www.amazon.com › QINIYEK-40GBASE-ER4-...
Amazon.com
https://www.amazon.com › QINIYEK-40GBASE-ER4-...
40GBase-ER4 QSFP+ Module: Data Rate:40 Gb/s, Interface:Duplex LC connector,SMF,Wavelength:1310nnm, Reach:up to 10km on Single Mode Fiber (SMF),Uncooled 4x10Gb/s ...Read more
T1-QSFP-40G-ER4-TAA
T1Nexus
https://t1nexus.com › ... › QSFP
T1Nexus
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40G QSFP Optical Transceiver provides 40Gbps speeds over a distance of up to 40km transmission on single-mode fiber (SMF).
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FIBERTOPSFP is a leading provider of qsfp28 qsfp+ er4. We can meet various requirements from different types of customers.
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