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M120 Power Supplies Description
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.
All power supplies are hot-removable and hot-insertable.
 | Note: To maintain proper cooling and prevent thermal shutdown of the operating power supply unit, each power supply slot must contain either a power supply or a blank panel. If you remove a power supply, you must install a replacement power supply or a blank panel shortly after the removal. |
 | 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. |
