Ac Power Supply Configurations; Mx480 Ac Power Supply Leds - Juniper MX480 Hardware Manual

AC Power Supply Configurations

The MX480 high-capacity and normal-capacity power supplies each support either of the following AC
power configurations:
In the low-line (110 V) AC power configuration, the MX480 router contains three or four AC power
supplies (see Figure 11 on page
PEM3 (left to right). Each AC power supply provides power to all components in the router. When three
power supplies are present, they share power almost equally within a fully populated system. Four AC
power supplies provide full power redundancy. If one power supply fails or is removed, the remaining
power supplies assume the entire electrical load without interruption. Three power supplies provide the
maximum configuration with full power for as long as the router is operational. The low-line configuration
requires three power supplies and the fourth power supply provides redundancy. With high-capacity
power supplies, you must have a minimum of three power supplies installed in the router.
In the high-line (220 V) AC power configuration, the MX480 router contains two or four AC power
supplies (see Figure 11 on page
PEM3 (left to right). In a high-line AC power configuration, each AC power supply provides power to all
components in the router. When two or more power supplies are present, they share power almost
equally within a fully populated system. Four AC power supplies provide full power redundancy. If one
power supply 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. In the two-PEM high-line configuration, slots PEM0 and PEM1 or PEM2 and PEM3
are used. The high-line configuration requires two power supplies, with the third and fourth providing
redundancy. With high-capacity power supplies, you must have a minimum of two power supplies
installed in the router.

MX480 AC Power Supply LEDs

Each AC power supply faceplate contains three LEDs that indicate the status of the power supply (see
Table 13 on page 49). The power supply status is also reflected in two LEDs on the craft interface. In
addition, a power supply failure triggers the red alarm LED on the craft interface.
47), located horizontally at the rear of the chassis in slots PEM0 through
47), located horizontally at the rear of the chassis in slots PEM0 through
48