During normal operation, the Acme Packet 4900 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 4900 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 4900 starts up with only one power supply, the alarm LED will blink continuously.

The grounding terminals are used to attach the Acme Packet 4900 chassis to a local earth ground. The terminals are located between media ports and the Serial Management port on the Acme Packet 4900 rear panel. The Acme Packet 4900 is shipped with nuts attached to the terminals along with a pre-made ground cable.

The auto-sensing AC power supply is rated at 110-240 VAC, 50-60 Hz, and is supplied with an IEC connector. The handle on the front panel of the power supply is used to remove the power supply from the chassis. The gray locking handle, when moved from right to left, unlocks the power supply from the chassis when removing the power supply.

The Acme Packet 4900 can be powered by central office –48 VDC operations with a DC-DC supply. The handle on the front panel of the power supply is used to remove the power supply from the chassis. Move the grey locking handle from right to left to unlock the power supply. A removable terminal block on the DC power supply serves as the DC power interconnect. The terminal block must be removed before the grey locking handle can be moved to free the power supply.

DC Power Cords

The mating connector kit includes components to create your own customized cable. You must supply both the wire and the terminations.

Connector Pin	Lead Designation	Suggested Wire Color (10AWG)
A3	- (-48VDC)	Black
A2	Chassis Ground	Green or Green/Yellow
A1	+ (RTN)	Red