Juniper Networks M5 Power Supply LEDs and Self-test Button, Fan Tray, States for Power Supply LED

Fan Tray

Description	Specification
Input DC current rating	13.5 A @ –48 V
Output voltages	+1.5 V, +2.5 V, +3.3 V, +5.0 V, +12 V, +12 V

The DC power supplies are marked –48 VDC. This is the nominal voltage associated with the battery circuit. Any higher voltages are to be associated only with float voltages for the charging function.

Power Supply LEDs and Self-test Button

Table 7 describes the LED on both AC and DC power supplies.

Table 7: States for Power Supply LED

Label	Color	State	Description
OUTPUT	Blue	On steadily	Power supply is functioning normally, input is
OK			occurring, outputs are within range, and the
			temperature is within range.
		Blinking	Power supply has failed.

The self-test button on the power supply faceplate initiates a self-test sequence. Do not press this button; it is for use by qualified service personnel only.

Fan Tray

The router cooling system consists of a fan tray that installs into the chassis from the rear, as shown in Figure 3. It houses four fans, which draw room air into the chassis to keep the internal temperature below a maximum acceptable level. The air flows side-to-side in the chassis, as shown in Figure 10.

Figure 10: Airflow through the Chassis

Fan tray	Front of chassis
	1305

Hardware Component Overview 19