3Com CoreBuilder 9000 ATM Interface Module Quick Start Manual page 27

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5 To engage the module and chassis backplane connectors, push both
module ejector handles simultaneously inwards toward the faceplate,
locking the module. (Figure 25). You feel a slight resistance as the
connectors engage.
Figure 25 Locking the Module Ejector Handles
1
Module ejector handles
CAUTION: If the resistance is too great, the ATM Interface Module and
backplane connectors may not be aligned. Forcing the ATM Interface
Module inward can damage the module or backplane connectors. If
necessary, remove and reinsert the ATM Interface Module, ensuring that
the connectors are properly aligned. Do not tighten the captive screws to
seat the module.