Where to buyQuote
  • Select Product
  • Transceivers
  • Cisco Transceivers
  • DACs & AOCs
  • Active Solutions
  • Media Converters
  • MultiService Platform
  • Optical Channel Devices
  • Passive Solutions
  • Multiplexers
  • Patch Cables
  • Memory Upgrades
  • Server
  • Desktop/Laptop
  • Network
  • Accessory Cables
  • A/V Cables & Misc
  • Power Adapters & Cables
  • USB Cables & Accessories
  • All
  • System Compatibility
  • Category
Interoperability QSFP28 LP Banners Pro Labs

QSFP28 100G: Interoperability with 40G, 25G, & 10G

Overview of QSFP28 Optic Types

Contact us

A 100G QSFP28 optic fiber module is a hot-pluggable transceiver module with a data rate of 100G. Each lane can carry up to 28Gbps of data, as indicated by the "28." The QSFP28 has four electrical lanes that can be configured as 4x10GbE or 4x25GbE depending on the transceivers used. The main types of QSFP28 optics consist of 100G QSFP28 SR4, QSFP28 PSM4, 100G QSFP28 LR4, and QSFP28 CWDM4, as seen below.

Optical Module Type


Fiber Type

Transmission Distance



Multimode OM4




Banded single mode



LC Duplex

Single mode



LC Duplex

Single mode


How to Run 40Gbps on QSFP28 100G Port

100G QSFP28 interface should accelerate to the comparable 40G and function with 40G QSFP+ optics if the opposing equipment uses 40G service speed.

Hardware Support

When using QSFP transceivers in QSFP28 ports, keep in mind that you have both single-mode and multimode (SR/LR) optical transceivers and twinax/AOC options that are available.

How to Realize 4x 10GbE Mode on QSFP28 100G Port

When the new switch only has 100G ports on one side and the existing devices only have SFP+ 10G ports on the other, it is probable to use the QSFP28 port in 4x 10GbE mode using a QSFP+ 40G optical transceiver.

Hardware Support

How to Realize 4x 25GbE Mode on QSFP28 100G Port

To achieve 100G transmission, four SFP28 can fully utilize the electrical lanes of the QSFP28.

Hardware Support

How to Restore QSFP28 100G Ports to Default Configuration

The following commands allow you to return the QSFP28 100G port to its default mode.

Configure the port to default mode

Restore factory settings

With the necessary hardware, the switch's QSFP28 100G port can operate in 40GbE, 4x 25GbE, and 4x 10GbE modes in addition to 100G mode. Moreover, it is equally important to understand how to return the switch port to its default mode.

For more information or a quote, contact us today.

Disclaimer: The information available may differ from device to device. For any further help, feel free to reach out to our support team.

More articles