Calculating The Dc Power Requirements For Your Mx2020 Router - Juniper MX2020 Hardware Manual

Calculating the DC Power Requirements for Your MX2020 Router

Follow these steps to calculate the DC power requirements for your MX2020 Router configuration.
1. Calculate the total output power required for your MX2020
typical power usage for the MX2020 DC power subsystem FRUs.
Table 77: Typical DC Power Usage for MX2020 Router
Component
Base chassis
Fan trays (upper and lower)
MPC
ADC
CB-RE
SFB—slots 0 through 7
MX2020 DC power subsystem (upper and lower half of chassis, 60 A
feeds to each PDM input)
MX2020 DC power subsystem (upper and lower half of chassis, 80 A
feeds to each PDM input)
MX2020 DC power subsystem (upper and lower half of chassis, 240-V
feeds to each PDM input)
NOTE: The power reservation for the critical FRUs is 7360 W. With power droop-sharing
between the two zones, the power reservation for critical FRUs is reduced to 5662 W.
This number assumes a 70/30% load on the power zones when droop sharing is enabled.
2. Evaluate the power budget, including the budget for each configuration if applicable, and check the
required power against the maximum output power of available PSM options.
lists the MX2020 PSMs, their maximum output power, and unused power (or power deficit).
FRUs.Table 77 on page 213
Model Number
CHAS-BP-MX2020
MX2000-FANTRAY
MPC-3D-16XGE-SFPP
ADC
RE-MX2000-1800X4
MX2000-SFB
shows the
Power Requirement (Watts) with
91% Efficiency
1700 W * 4 = 6800 W
440 W * 20 = 8800 W
150 W * 20 = 3000 W
250 W * 2 = 500 W
220 W * 8 = 1760 W
2100 W * 8 PSMs=16,800 W (+ 1
PSM@2100 W redundant capacity)
2500 W * 8 PSMs=20,000 W (+ 1
PSM@2500 W redundant capacity)
2500 W * 8 PSMs=20,000 W (+ 1
PSM@2500 W redundant capacity)
Table 78 on page 214
213