Emerson RTM-ATCA-F120-OPT Installation And Use Manual page 40

Hardware Preparation and Installation
3. Grasp the SFP/SFP+ module and carefully slide it out of the slot.
4. Cover the optical port with the optical port plug.
SFP/SFP+ Module Damage
The optical port plug protects the sensitive optical fibres against dirt and damage. Dirt and
damage can render the SFP/SFP+ module inoperable.
Only remove the optical plug when you are ready to connect a cable to the SFP/SFP+ module.
When no cable is connected, cover the port with an optical port plug.
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RTM-ATCA-F120-OPT Installation and Use (6806800G29B)