Juniper Networks M160 manual Power consumption for maximum configuration

M160 Internet Router Hardware Guide

Table 16: Component Power Requirements

Component	Power Requirement (Amps)
Base system (cooling system, power supplies, and craft	7-10 A/48 V
interface)
Host module (Routing Engine and MCS)	1.3 A/48 V
FPC	2.4 A/48 V
PCG	0.2 A/48 V
SFM	1.3 A/48 V

You can use the information in Table 16 and the M160 Internet Router 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 FPC	+	1 SFM +		1 host module + 2 PCGs + 4 PICs =
7 A	+ 2.4 A	+ 1.3 A	+	1.3 A	+	2(0.2 A) + 4(0.625 A) =
7 A	+ 2.4 A + 1.3 A + 1.3 A				+ 0.4 A + 2.5 A = 14.9 A @ 48 V = 715 W DC

Power consumption for maximum configuration:

Base system + 8 FPCs + 4 SFMs + 2 host modules +		2 PCGs + 32 PICs =
10 A	+ 8(2.4 A) + 4(1.3 A) + 2(1.3 A) + 2(0.2 A) +	32(0.625 A) =
10 A	+ 19.2 A + 5.2 A + 2.6 A + 0.4 A + 20 A = 57.4 A @ 48 V = 2755 W DC

Input current from a DC source other than 48 V (based on maximum configuration):

(54 VDC input)		x	(input current X) = (48 VDC input) x (input current Y)
54 x	X = 48	x	57.4 A
X = 48	x 57.4 A/54 = 51.0 A

System thermal output for maximally configured router:

105% of Watts DC/0.293 = BTU/hr

1.05 x 2755/0.293 = 9873 BTU/hr

NOTE: If you plan to operate a maximally configured router, we recommend that you provision at least 70 A @ 48 VDC and use a facility circuit breaker rated for 70 A minimum. Doing so enables you to operate the router in any configuration without upgrading the power infrastructure, and allows the router to function at full capacity using one power supply.

If you plan to operate the router at less than the maximum configuration and do not provision a 70 A circuit breaker, we recommend that you provision a circuit breaker rated for at least 125% of the continuous current that the system draws at 48 V.

66 Power Guidelines, Requirements, and Specifications