Juniper M320 Hardware Manual page 125

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Table 58: Component Power Requirements (continued)
Component
Cooling system (normal speed)
Cooling system (full speed)
PIC—Generalized typical value
PIC—Generalized maximum value
You can use the information in
Router Interface Module Reference 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 a DC-powered router.
Example of calculating power consumption for minimum configuration:
Base system + 1 FPC + 1 PIC =
9.4 A + 3.3 A + 0.625 A = 13.3 A @ –48 VDC = 638 W DC
Example of calculating power consumption for maximum configuration:
Base system + 1 Host subsystem + 2 redundant DC power supplies + 8 FPCs + 32 PICs
=
9.4 A + 2.1 A + 2(0.8) A + 8(3.3 A) + 32(1.1 A) =
9.4 A + 2.1 A + 1.6 A + 26.4 A + 35.2 A = 74.7 A @ –48 VDC =3,586 W DC
Current requirement adjustment for fans running at full speed (high temperature
environment or cooling component failure):
Calculated system current (X) – Cooling (normal) + Cooling (full speed) =
X A – 2.9 A + 4.0 A =
X A + 1.1 A
Input current from a DC source other than –48 VDC (based on maximum configuration;
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 57.9 A
X = 48 x 57.9 A/54 = 51.5 A
Example of calculating system thermal output for a DC-powered router:
Watts DC/0.293 = BTU/hr
3,586/0.293 = 12,239 BTU/hr
Example of calculating system thermal output for an AC-powered router:
Watts DC/85% AC PEM efficiency/0.293 = BTU/hr
3,586/0.85/0.293 = 14,398 BTU/hr
M320 Power System Description on page 73
Power
Requirement
(Watts)
140 W
200 W
30 W
52.8 W
Table 58 on page 96 and the M320 Multiservice Edge
Chapter 9: Preparation Overview
Current
Requirement
(Amps @
–48 VDC)
2.9 A
4.0 A
0.625 A
1.1 A
97