3Com AccessBuilder 4000 Installation Manual page 69

Figure C-4 Removing a Face Plate
Only remove the face plate from the I/O slot you are planning to use.
All unused I/O slots must have the face plate installed to maintain
proper cooling of the unit and regulatory compliance. Failure to cover
open slots can result in overheating and void the warranty.
6 Insert the I/O card into the uncovered I/O slot as follows:
a With the connector end toward the backplane and the card panel
facing you, grasp the left and right sides of the back panel and fit
the card into the card guides in the I/O slot opening.
The card fits in only one way, the labels on the back panel should
be right side up.
b Slide the card into the chassis until the card engages the backplane
connectors.
c Secure the I/O card in the slot by tightening the captive screws
shown in Figure C-5.
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Installation Procedure
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