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Determining High-Voltage Universal (HVAC/HVDC) Power Requirements for Your MX2010 Router

The information in this topic helps you determine which PSMs are suitable for various configurations, as well as which PSMs are not suitable because output power is exceeded. You determine suitability by subtracting the total power draw from the maximum output of the PSMs. Afterward, you calculate the required input current. Finally, you calculate the thermal output.

We recommend that you provision power according to the maximum input current listed in the power system electrical specifications (see MX2000 Router High-Voltage Universal (HVAC/HVDC) Power Subsystem Electrical Specifications).

Use the following procedures to calculate the power requirement:

  1. Calculate the power requirement.

  2. Evaluate the power budget.

  3. Calculate input power.

  4. Calculate thermal output (BTUs) for cooling requirements.

The MX2010 HVAC/HVDC power system provides power to the FRUs in the chassis. Each power system is made up of two HVAC/HVDC PDMs, nine PSMs, ten MPCs, four fan trays, eight SFBs, and two Control Board and Routing Engines (CB-REs).

  1. Calculate the power requirements (usage) using the values in MX2010 High-Voltage Universal (HVAC/HVDC) Power Requirements as shown in Table 1.

    Table 1: HVAC/HVDC Power Requirements for MX2010 Router


    Model Number

    Power Requirement (Watts) with 91% Efficiency

    Base chassis


    Fan trays (upper and lower)


    1500 W * 2 + 300 W * 2= 3600 W



    1980W * 10 = 19800 W



    150 W * 10 = 1500 W



    250 W * 2 = 500 W

    SFB—slots 0 through 7


    385 W * 8 = 3080 W

    MX2010 HVAC/HVDC power system (upper and lower half of chassis, 19 A feeds to each PDM input)

    3000 W * 8 PSMs=24,000 W (+ 1 PSM@3000 W redundant capacity)

  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 PDM options.

    Table 2 lists the PSMs, their maximum output power, and unused power (or a power deficit).

    Table 2: Calculating HVAC/HVDC Power Budget

    Power Supply Module

    Maximum Output Power of Power Supply Module (Watt)

    Maximum Output Power for System (Watt)—Including Redundant Capacity

    MX2010 Universal (HVAC/HVDC) PSM

    3000 W for single feed

    3400 W for dual feed

    3000 * 9 PSM with single feed = 27,000 W (PSM redundancy)

    3400 * 8 PSM with dual feed = 27,200 W (feed redundancy)

  3. Calculate input power. Divide the total output requirement by the efficiency of the PSM as shown in Table 3.

    Table 3: Calculating HVAC/HVDC Input Power

    Power Supply Module

    Power Supply Module Efficiency

    Input Power Requirement (Watt)—per PSM

    MX2010 Universal (HVAC/HVDC) PSM


    3300 W for single feed, 3800 W for dual feed

  4. Calculate thermal output (BTUs). Multiply the input power requirement (in watts) by 3.41 as shown in Table 4.

    Table 4: Calculating Typical HVAC/HVDC Thermal Output

    Loaded Chassis Heat Load

    Thermal Output (BTUs per hour)

    Loaded chassis configuration

    Typical power divided by (0.91 * 3.41) = BTU/hr.

    BTU = 18,000 divided by (0.91 * 3.41) = 5,800 BTU/hr.

    18,000 KW of output power consumed by the chassis. This is the typical output the chassis can consume in a redundant configuration.