The A-H1 is typically located near the A/V receiver and connects to its line-level outputs. The hub provides four IR emitter mini jacks for local component source control. It also provides a 12-volt status jack that allows you to tell when your A/V system is turned on (this feature requires a Russound 846C power supply).
The A-H1 connects to the A-H4P hub in the structured wiring panel with standard CAT-5 cable. This connection carries the audio, IR, and status/control information, which is then distributed to your amplified keypads and speakers.