Table 29: Sample Power Requirements For An Mx104 Router; Table 30: Calculating Input Power Example - Juniper MX104 Hardware Manual

MX104 3D Universal Edge Router Hardware Guide

Table 29: Sample Power Requirements for an MX104 Router

Chassis Component
Base system
MIC 0
MIC 1
Total output power

Table 30: Calculating Input Power Example

Item
Total input power requirement (maximum)
AC/DC power supply efficiency
Sum of MIC power requirements
Additional power supply conversion losses, due to added MICs
(Sum of MIC power requirements) * (efficiency) - (Sum of MIC power requirements)
Input power to base system (includes power conversion losses in power supplies)
Total calculated input power requirement with MICs
(Sum of MIC power requirements) + (Additional power supply conversion losses) +
(Input power to base system)
166
To calculate the power requirements:
Calculate the power requirements (usage) using the values in
1.
for MX104 Components" on page 164
Part Number
MX104-AC
MIC-3D-20GE-SFP
MIC-3D-20GE-SFP
NOTE: The power consumed by an MX104 router as shown in
Table 29 on page
in the power supply.
Evaluate the power budget. In this step, we check the total output power against the
2.
maximum output power of available power supply options.
Calculate input power. In this step, the input power requirements for the example
3.
configuration are calculated. To do this, calculate the total input power including the
MICs as shown in Table 30 on page
Calculate thermal output (BTUs). To calculate this, multiply the input power
4.
requirement (in watts) by 3.41.
as shown in Table 29 on page
Power Requirement
350 W
37 W
37 W
424 W
166, may differ slightly, due the power conversion losses
166.
Value
625 W
91 %
37 W + 37 W = 74 W
(74 W) * 91 % – (74 W) = 7.3 W
350 W
74 W + 7.3 W + 350 W= 431.3 W
Copyright © 2014, Juniper Networks, Inc.
"Power Requirements
166.