Juniper Networks M10, M5 manual Component Power Requirements, Feb

Power Guidelines, Requirements, and Specifications

Table 9: Component Power Requirements

	Power Requirement	Power Requirement
Component	(Watts)	(Amps)
Base system (all components except PICs,	188 (approximate)	4 A/48 V
with fans running at normal speed)		(approximate)
Fans running at full speed (additional power	40 (approximate)	0.833 A/48 V
required)
Routing Engine	17	0.2 A/48 V
FEB	50	1.1 A/48 V

You can use the information in Table 9 and the M5 and M10 Internet Routers PIC Guide to calculate power consumption for various hardware configurations, input current from a different source voltage, and thermal output, as shown in the following examples. (For an added safety margin, the examples use a generalized value for PICs of 0.625 A/48 V each.)

•Power consumption for minimum configuration:

Base system	+	1 FEB +	1 Routing Engine + 1 PIC =
4 A + 1.1 A	+	+ 0.2 A	+ 0.625 A = 5.925 A @ 48 V = 284 W DC

•Power consumption for maximum configuration (M5 router):

Base system			+ 1 FEB	+	1 Routing Engine + 4 PICs =
4 A	+ 1.1	A	+ 0.2 A		+ 4(0.625 A) =
4 A	+ 1.1 A	+ 0.2 A		+	2.5 A = 9.6 A @ 48 V = 461 W DC

•Power consumption for maximum configuration (M10 router):

Base system			+ 1 FEB	+	1 Routing Engine + 8 PICs =
4 A	+	1.1 A	+ 0.2 A		+ 8(0.625 A) =
4 A	+	1.1 A	+ 0.2 A	+	5 A = 10.3 A @ 48 V = 494 W DC

•Input current from a DC source other than 48 V (based on maximally configured M10 router; applies to DC power supply only):

(54 VDC input)		x	(input current X) = (48 VDC input) x (input current Y)
54 x	X = 48	x	10.3 A
X = 48	x 10.3 A / 54 = 9.1 A

•System thermal output for maximally configured AC-powered M10 router:

Watts DC/85% AC PEM efficiency/0.293 = BTU/hr 494/0.85/0.293 = 1984 BTU/hr

•System thermal output for maximally configured DC-powered M10 router:

Watts DC/0.293 = BTU/hr

494/0.293 = 1686 BTU/hr

44M5 and M10 Internet Routers Hardware Guide