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M10i Power System Description


The router uses either AC or DC power. You can install up to three AC power supplies or four DC load-sharing power supplies at the bottom rear of the chassis, as shown in M10i Chassis Description. The power supplies connect to the midplane, which distributes power to router components according to their individual voltage requirements. When the power supplies are installed and operational, they automatically share the electrical load.

An enable control pin on the output connector of each power supply ensures that the supply is fully seated into the router midplane before the supply can be turned on. The enable pin prevents a user-accessible energy hazard, so there is no interlocking mechanism. The enable pin disables the voltage at the output connector if the power supply is not turned off before removal.

Redundant power supplies are hot-removable and hot-insertable, as described in M10i Field-Replaceable Units (FRUs).


After powering off a power supply, wait at least 60 seconds before turning it back on. After powering on a power supply, wait at least 60 seconds before turning it off.

If the router is completely powered off when you power on the power supply, the Routing Engine boots as the power supply completes its startup sequence. If the Routing Engine finishes booting and you need to power off the router again, see Powering Off the M10i Router .

After a power supply is powered on, it can take up to 60 seconds for status indicators—such as the output status LED on the power supply, the command display output, and messages on the LED display on the craft interface—to indicate that the power supply is functioning normally. Ignore error indicators that appear during the first 60 seconds.

Figure 1: M10i Router Power Supplies
M10i Router Power Supplies