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 | Interface | Fiber Type | Transmission Distance |
100GBASE-SR4 QSFP28 | MTP/MPO 12 | Multimode OM4 | 100km |
100GBASE-PSM4 QSFP28 | MTP/MPO 12 | Banded single mode | 500km |
100GBASE-LR4 QSFP28 | LC Duplex | Single mode | 10km |
100GBASE-CWDM4 QSFP28 | LC Duplex | Single mode | 2km |
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.
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
To achieve 100G transmission, four SFP28 can fully utilize the electrical lanes of the QSFP28.
Hardware Support
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.
Disclaimer: The information available may differ from device to device. For any further help, feel free to reach out to our support team.
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