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    Power Consumption for a DC-Powered MX80 Router

    To allow for future growth so that you can operate the router in any hardware configuration without upgrading the power infrastructure, we recommend that you provision at least 25 A @ –48 VDC for each input.

    Table 1 and Table 2 list the power requirements for base DC-powered routers operating under typical voltage conditions.

    If you do not plan to provision at least 25 A @ –48 VDC per input, you can use the information in Table 1, Table 2, and Table 3 to calculate the power consumption @ –48 VDC and thermal output for your hardware configuration.

    Table 1: DC-Powered Base Router Power Requirements for the Fixed MX80 Router

    Fixed Chassis Configuration

    Power Requirement (Watts)

    Current Requirement (Amps @ –48 VDC)

    Chassis running at high activity, with four 10-Gigabit Ethernet XFPs, and fans running at high speed

    320 W

    6.7 A (approximate)

    Table 2: DC-Powered Base Router Power Requirements for the Modular MX80 Router

    Modular Chassis Configuration

    Power Requirement (Watts)

    Current Requirement (Amps @ –48 VDC)

    Chassis running at high activity, with four 10-Gigabit Ethernet XFPs, two MICs, and fans running at high speed

    310 W

    6.5 A (approximate)

    Table 3 lists the power requirements for various hardware components when the router is operating under typical voltage conditions.

    Table 3: Component Power Requirements for DC-Powered Routers

    Component

    Power Requirement (Watts)

    Current Requirement (Amps @ –48 VDC)

    MIC (generalized value)

    35 W

    0.73 A

    These examples show how to calculate typical power consumption for your DC-powered router configuration. The examples use generalized values for MICs. For exact MIC power requirements, see the MX Series 3D Universal Edge Routers Line Card Guide.

    Typical power consumption for modular DC-powered routers:

    • Active DC-powered router with one MIC:
      Base router (high activity, with four 10-Gigabit Ethernet XFPs, and fans running at high speed) + 1 MIC =5 A + 0.73 A = 5.73 A @ –48 VDC = 275 W DC
    • Active DC-powered router with two MICs:
      Base router (high activity, with four 10-Gigabit Ethernet XFPs, and fans running at high speed) + 2 MICs 5 A + 2(0.73 A) = 6.46 A @ –48 VDC = 310 W DC
    • Input current from a DC source other than –48 VDC (based on maximum configuration; applies to DC power supply only):
      (–54 VDC input) * (input current X) = (–48 VDC input) * (input current Y)54 * X = 48 * 25 AX = 48 * 25 A/54 = 22.2 A
    • Example of calculating system thermal output:
      Watts DC * 3.41 = BTU/hr500 * 3.41 = 1,705 BTU/hr

    Published: 2010-10-22