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 FRUs.Table 77 on page 213 shows the
typical power usage for the MX2020 DC power subsystem FRUs.
Table 77: Typical DC Power Usage for MX2020 Router
Power Requirement (Watts) with
91% EfficiencyModel NumberComponent
CHAS-BP-MX2020Base chassis
1700 W * 4 = 6800 WMX2000-FANTRAYFan trays (upper and lower)
440 W * 20 = 8800 WMPC-3D-16XGE-SFPPMPC
150 W * 20 = 3000 WADCADC
250 W * 2 = 500 WRE-MX2000-1800X4CB-RE
220 W * 8 = 1760 WMX2000-SFBSFB—slots 0 through 7
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)
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)
2500 W * 8 PSMs=20,000 W (+ 1
PSM@2500 W redundant capacity)
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. Table 78 on page 214
lists the MX2020 PSMs, their maximum output power, and unused power (or power deficit).
213
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