Cisco Systems 4500 manual Calculating DC Input Current section on

Appendix A Specifications

Catalyst 4500 Series Power Supplies

Table A-8		1400 W DC-Input Power Supply Specifications (continued)
	Item		Specification
	DC-input current		Data only: 31 A @ –60 VDC
			Data and inline devices: 180 A maximum @ –48 VDC input
			Note The input power is configurable in the CLI. The Cisco
				IOS command is power dc input. The Catalyst
				Operating Sysytem command is set power DC input.
				Configure the switch software to match the
				requirements of your switch. To learn how to calculate
				the DC input current for your system, refer to the
				“Calculating DC Input Current” section on page 2-14.
	Input power		1866	W (Data only)
	Current draw At –40.5 V (min voltage)		46 A
	Current draw at –72 V (max voltage)		25.9 A
	Max heat dissipation at 1866 W		5760	BTUs
			179 A max @ 48 VDC
	Maximum KVA rating		1.87 (data)
			9.15 (data and voice)
	Power supply output (DC supply)		Data: 12 V @120 A, 3.3 V @ 10 A
			Inline devices: 140 A total maximum (35 A maximum each
			per 5 channels) @–48 to 60 VDC input
			1367	W+ 40 W redundant mode (Data)
			2267	W maximum in combined mode (Data)
			7500	W maximum each in redundant mode (PoE)
			7280	W maximum in combined mode (PoE)
	DC input terminal block		Accepts FCI p/n YAV25L2TC14FX90 or equivalent,
			barrel-type lug terminals with 90-degree angle, two- hole
			tongue, which accommodates 1/0 AWG size copper wire. The
			connector tongue width is 0.82 in, the stud hole spacing is 5/8 in,
			and the hole size is 1/4 in.
	Output holdup time		4 ms
	Max heat dissipation		1591	BTUs/hr (data)
			2905	BTUs/hr (data and voice)
				Catalyst 4500 Series Switches Installation Guide
	78-14409-08				A-13