Cisco 7800 Series Accessories Manual page 67

Key Expansion Modules
Step 8
(Optional) Use a second key expansion module spine connector to connect the second key expansion module
to the first key expansion module.
Step 9 (Optional) Use a third key expansion module spine connector to connect the third key expansion module to
the second key expansion module.
Step 10 Use a screwdriver to fasten the screws into the phone.
This step ensures that the phone and key expansion module remain connected at all times. This diagram shows
the location of the screw holes on the phone and one key expansion module.
Cisco IP Phone 7800 and 8800 Series Accessories Guide for Cisco Unified Communications Manager
Connect a Key Expansion Module to a Cisco IP Phone
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