Can I use a GE optical module on a 10GE optical port or a 100M optical module on a GE optical port

A high-speed optical port supports low-speed SFP, eSFP, and SPF+ modules.

Generally, optical ports on a modular switch support low-speed optical modules. However, on a fixed switch, downlink optical ports support low-speed optical modules, but uplink optical ports do not. You can use a GE optical module on a 10GE optical port or a 100M optical module on a GE optical port.

NOTE:
Normally, you are not advised to install a low-speed optical module on a high speed optical port.

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