Cisco Systems 4500 manual DC Triple-input Power Supply Operational Modes

Chapter 1 Product Overview

Power Supplies

For a 1400 W DC power supply, the main power switch has an input range of –40.5 to –72 V DC, while the –48 V PoE operates over a range of –40.5 to –56 V DC. The PoE either fails to start or shuts down if exposed to greater than –56 V DC input. PoE recovers after you recycle input power within the proper voltage range. If the PoE shuts down due to input overvoltage (greater than –56 V DC), the main converter section does not shut down.

The supervisor engine monitors the status of each power supply and provides a status report through the switch software. For more details on how the supervisor engine monitors the power supplies, refer to the “Environmental Monitoring and Power Management” chapter of the Catalyst 4500 Series Switch Cisco IOS Software Configuration Guide.

1400 W DC Triple-input Power Supply Operational Modes

The C4500 1400 W DC Triple Input SP Power Supply (data only) allows added redundancy by providing terminals for two DC inputs rated at 15 A and one rated at 12.5 A per power supply.

This power supply has five operational modes depending on the inputs receiving power. When all three inputs are active, at input voltages greater than –44.0 V DC, the power supply delivers 1400 W maximum total output. Table 1-8provides output information for these modes, given a single supply.

		Table 1-8	Input Modes
		Input	Input		Maximum Total Output
		Mode	Number	Input Configuration	Power
1			1	1 x 12.5 A	386 W @ –40.5 V DC
					412 W @ –44.0 V DC
2			2 OR 3	1 x 15 A	466 W @ –40.5 V DC
					495 W @ –44.0 V DC
3			1, 2 OR 3	1 x 12.5 A and	845 W @ –40.5 V DC
				1 x 15 A	908 W @ –44.0 V DC
4			2, 3	2 x 15A	914 W @ –40.5 V DC
					990 W @ –44.0 V DC
5			1, 2, 3	1 x 12.5A and	1294 W @ –40.5 V DC
				2 x 15 A	1400 W @ –44.0 V DC
				Catalyst 4500 Series Switches Installation Guide
	78-14409-08					1-39