During normal operation, the Acme Packet 6400 is load-balanced and draws power from both supplies. The two power supplies also provide hardware redundancy. If a power supply fails, the Acme Packet 6400 can rely on only one functional power supply to sustain normal operation. A malfunctioning power supply must be removed and replaced as soon as possible. If the Acme Packet 6400 starts up with only one power supply, the alarm LED will blink continuously.

The grounding terminals are used to attach the Acme Packet 6400 chassis to a local earth ground. The terminals are located to the right of the media ports. The Acme Packet 6400 is shipped with nuts attached to the terminals along with a pre-made ground cable.