Connect The Power Supply Unit - Cisco Unified IP Phone Expansion Module 7915 Manual

Plug one end of the second interface cable into the AUX
Step 3
jack with the "out" icon underneath on the first
Expansion Module (the one closest to the phone).
Plug the other end of the second interface cable into the
Step 4
AUX jack with the "in" icon underneath on the second
Expansion Module (the one next to the first Expansion
Module).

Connect the Power Supply Unit

Refer to Figure 6 and the steps that follow.
Figure 6 Connecting the Power Supply Unit
Power supply connector on the back of the
1
Expansion Module
12