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Can QSFP28 run at 10gb?
Knowledge Base + 2024.01.12

No, QSFP28 (Quad Small Form-factor Pluggable 28) transceivers are designed to run at much higher data rates than 10gb. They are capable of supporting data rates of 100gb and 40gb Ethernet, as well as EDR InfiniBand. Therefore, they are not intended for 10gb operation.

QSFP28 modules can be used at lower data rates, including 10 Gigabit Ethernet (10G), under certain conditions.

Here are some considerations regarding using QSFP28 modules at 10G:

  1. Backward Compatibility:

    • QSFP28 modules are generally backward compatible with lower-speed standards, including 10 Gigabit Ethernet. However, the actual compatibility may depend on the specific implementation of the QSFP28 module and the networking equipment.

  2. Data Rate Configuration:

    • Some networking devices and QSFP28 modules may support configurable data rates. This means that you can configure the module to operate at a specific data rate, such as 10G, even though it is designed to support higher data rates.

  3. Mode and Configuration:

    • In some cases, the QSFP28 module may need to operate in a specific mode or configuration to support lower data rates like 10G. This may involve configuring the module or using it in a certain mode compatible with the desired data rate.

  4. Transceiver Type:

    • The transceiver type within the QSFP28 module may play a role. Some QSFP28 modules are designed with optics that are optimized for higher data rates, and their performance at lower data rates may vary.

It's important to check the specifications provided by the manufacturer of the QSFP28 module and the networking equipment to ensure compatibility and proper operation at 10G. If you specifically need 10 Gigabit Ethernet connectivity, it might be more straightforward to use dedicated 10G optics or modules designed for that data rate.