Juniper Networks M5 - Manual (Page 39)

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
On steadily Power supply is functioning normally, input is
occurring, outputs are within range, and the
temperature is within range. OUTPUT
OK Blue
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
1305
Front of chassis Fan tray
Hardware Component Overview 19