AT&T MERLIN LEGEND Release 3.0 Installation Manual page 270

Completing the Upgrade
3 Connect the side panels to the front panel(s) in the same way.
4 Pickup the housing and place it on the control unit. If the system has
more than one carrier, make sure you hold the housing only from the
basic carrier side; otherwise, the housing can disassemble.
a Line up the wire clips that are attached to the carrier with the recesses on
the outside of the side panels.
b Push back the panels until the clips hook over the tabs and rest in the
recesses.
Figure 9-8. Installing the Control Unit Housing
FRONT PANEL
SLIDE TONGUES IN
AND PUSH FRONT PANEL UP
LINE UP WITH THE
SEMICIRCLE ON INSIDE
OF FRONT PANEL
Upgrading the System 9-17