AT&T RELEASE 2 - Manual (Page 17)

Inserting a Line Module
Make sure that the power switch is off and that the system is unplugged from
the power source. Then do as follows:
1 Be sure the top and front covers are off.
2 Locate the slot immediately to the right of the line module already
installed. Notice the plastic channels at the top and bottom of the slots.
3 Align the top and bottom edges of the line module to the channel
openings so that the gold connectors face in and the components face out
and to the right of the slot.
FIGURE 11 Inserting a second line module.
4
5
6
Hold the module by the plastic knob and slide it into the slot. See
Figure 11.
Slide the module in until the gold connectors insert fully into the port at
the back of the unit and the module snaps into place.
Check that the module is held in place by the safety catch at the bottom of
the slot. It should fit snugly against the bottom front of the module.
CAUTION: You may need to exert mild force to insert the module;
however, do not use excessive force. If you have difficulty, remove
the module from the slot, align the module properly, and try again.
If you still have difficulty, check the module and the channel for
damage. If you find any damage, such as broken pieces or plastic
chips, contact your equipment supplier for assistance. If there is no
damage, try one more time; the module should snap into place.
Step 1: Installing the Control Unit 13