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    M120 Router Power Supplies

    The M120 router is configurable with either one or two AC or DC power supplies. The power supplies connect to the midplane, which distributes the different output voltages produced by the power supplies to the router components, depending on their voltage requirements.

    Caution: Mixing AC and DC power supplies is not supported. The first power supply powered on will electrically disable the second power supply without damaging any components in the system.

    In the AC power configuration, the router contains two AC power supplies (see Figure 1), located vertically at the rear of the chassis in slots PEM0 through PEM1 (left to right). Each AC power supply provides power to all components in the router. When two power supplies are present, they share power almost equally within a fully populated system.

    Each AC power supply has two AC appliance inlets. Each requires a dedicated AC power feed. For 100-120 VAC, both inlets are used and the bottom inlet cover must be removed prior to installation. For 200-240 VAC, only the top inlet is used.

    Figure 1: M120 Router AC Power Supply

    M120 Router AC Power
Supply

    In the DC power configuration, the router contains two DC power supplies (see Figure 2), located in the right rear of the chassis in slots PEM0 and PEM1 (left to right). A single DC power supply provides sufficient power for a fully configured router.

    Two DC power supplies share power almost equally within a fully populated system. If either power supply fails, the remaining power supply takes over without interruption.

    Each DC power supply has a single DC input (–48 VDC and return) that requires a dedicated 60 A (–48 VDC) circuit breaker for the maximum router hardware configuration.

    Figure 2: M120 Router DC Power Supply

    M120 Router DC Power
Supply

    Published: 2012-08-20