3Com Dual PRI Getting Started Manual page 11

2-4 C 2: I
HAPTER NSTALLATION
5 Insert the NAC between the slot's upper and lower card guides.
6 Holding the tabs perpendicular to the NAC's front panel, slide the NAC
into the chassis, until the front of the NAC is flush with the chassis.
Push the tabs toward each other to secure the NAC.