Juniper EX9208, Hardware Manual, Page: 69 / 396

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In the low-line (100–120 V) AC power configuration, the EX9208 switch contains three
or four AC power supplies, located horizontally at the rear of the chassis in slots
PEM0
through
PEM3
(left to right). Each AC power supply provides power to all components
in the switch. 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 switch is operational. The low-line
configuration requires three power supplies and the fourth power supply provides
redundancy.
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In the high-line (200–240 V) AC power configuration, the EX9208 switch contains
two or four AC power supplies, located horizontally at the rear of the chassis in slots
PEM0 through PEM3 (left to right). In a high-line AC power configuration, each AC
power supply provides power to all components in the switch. 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 switch 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.
Related
Documentation
AC Power Supply Specifications for EX9208 Switches on page 92
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AC Power Supply LEDs in an EX9208 Switch on page 45
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Power Requirements for EX9200 Switch Components on page 91
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Installing an AC Power Supply in an EX9208 Switch on page 215
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Removing an AC Power Supply from an EX9208 Switch on page 217
AC Power Supply LEDs in an EX9208 Switch
An AC power supply has three LEDs on its faceplate. These LEDs display information
about the status of the AC power supply. The power supply status is also reflected in
two LEDs on the craft interface. In addition, a power supply failure triggers the major
alarm LED on the craft interface.
Table 20 on page 46 describes the LEDs on an AC power supply in an EX9208 switch.
45 Copyright © 2017, Juniper Networks, Inc.
Chapter 4: Power Supplies