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Figure 15: AC Power Supply
WARNING: The router is pluggable type A equipment installed in a restricted-access
location. It has a separate protective earthing terminal (sized for UNC 1/4-20 ground
lugs) provided on the chassis in addition to the grounding pin of the power supply
cord. This separate protective earthing terminal must be permanently connected to
earth.
In the high-line (220 V) AC power configuration, the MX240 router contains one or
two AC power supplies, located horizontally at the rear of the chassis in slots PEM0
and PEM2 (left to right) (see Figure 3 on page 7). The high-line configuration requires
one power supply, with the second power supply providing redundancy. 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.
If one power supply fails or is removed, the remaining power supply assumes the
entire electrical load without interruption. One power supply can provide the
maximum configuration with full power for as long as the router is operational.
In the low-line (110 V) AC power configuration, the MX240 router contains either
two AC power supplies (nonredundant), located horizontally at the rear of the chassis
in slots PEM0 and PEM1 (left to right); or four AC power supplies (redundant), located
in slots PEM0 through PEM3 (left to right) (see Figure 2 on page 6). The low-line
configuration requires two power supplies, and the third and fourth power supplies
provide redundancy. 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. If one power supply in a redundant configuration
fails or is removed, the remaining power supplies assume the entire electrical load
without interruption. Two power supplies provide the maximum configuration with
full power for as long as the router is operational.
AC Power Supply LEDs
Each AC power supply faceplate contains three LEDs that indicate the status of the
power supply (see Table 17 on page 23). The power supply status is also reflected
in two LEDs on the craft interface (see Table 13 on page 19). In addition, a power
supply failure triggers the red alarm LED on the craft interface.
22 ■ Power Supplies
MX240 Ethernet Services Router Hardware Guide