Figure 31: Ac Power Supply - Juniper QFabric QFX3000-G Hardware Documentation

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provided on the chassis. This separate protective earthing terminal must be

permanently connected to earth ground.

The power supplies in a QFX3008-I Interconnect device continue to

draw a small amount of power when the C19 wiring tray power switch is in

the off position. The status LEDs on each power supply blink amber because

the power supply fans are not operating. This is expected behavior.

The QFX3008-I Interconnect device has two protective earthing

terminals provided on the rear of the chassis. Only one of these protective

earthing terminals needs to be permanently connected to earth ground. The

first pair is sized for M6 screws and is located below the wiring tray on the

bottom left corner at the rear of the chassis. The second pair is sized for UNC

¼-20 screws and is located below the second wiring tray on the bottom right

corner at the rear of the chassis. The grounding points are spaced at 0.625

in. (15.86 mm).

Each power supply is cooled by its own fans. The airflow is from the front of the power

supply to the back. Hot air exhausts from the rear of the chassis. Three LEDs on the

faceplate indicate the status of the power supply. See

Figure 31: AC Power Supply

Each power supply contains two isolated 2000-W channels that produce 54 VDC. The

midplane distributes the output power produced by the power supplies to different

system components.

The distribution of power to the QFX3008-I Interconnect device is divided between

components, and each power supply provides power to different components. Together,

Chapter 3: QFX3008-I Overview

Figure 31 on page

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