Adding a KSU2 Second Cabinet You can add one KSU2 to a KSU1. The KSU2 adds: • eight digital DX-80 extension ports • four CO line ports • one Power Failure Transfer port • Extension Expansion connectors for two additional DPM8s or one APM4 • Ribbon cable for one APM4 • Ribbon cable for one COM4 Connect the KSU2 to the KSU1 via a designated connector located on the CPM inside the KSU1. To install the KSU2 perform the following steps. 1. Be sure that the entire system is turned off. 2. Remove the KSU cover (four screws at each corner) on both KSU1 and KSU2. 3. Connect a static discharge wrist strap to a suitable earth ground. Be sure that the strap is touching bare skin.