H3C S5120-EI Series, Installation, Quick Start, Page: 14 / 31

2-7
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Do not touch the electronic components on an interface card to
avoid damaging the interface card.
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After removing an interface card, install a blank panel to the
empty slot to prevent dust from entering the switch.
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If there is a ”DO NOT REMOVE” label on the rear panel, the
switch does not support interface cards. Do not remove the blank
panel that has the label on it.