JUNOS Internet Software Network Operations Guide: Hardware
232 ! Checking the Power Supply Status
Step 2: Check the Power Supply LEDs
Action To check the power supply status, look at the four LEDs on the faceplate. Table 55
describes the M5 and M10 router output LED and self-test button for both the AC
and DC power supplies.
Table 55: M5 and M10 Router Power Supply LED and Self-Test Button
Table 56 describes the functions of the LED on both the M7i and M10 router AC and
DC power supplies.
Table 56: M7i and M10i Router AC/DC Power Supply LED
Table 57 describes the functions of the M20 router power supply LEDs.
Table 57: M20 Router Power Supply LEDs
Table 58 describes the functions of the M40 router power supply LEDs.
Table 58: M40 Router Power Supply LEDs
Label Color State Description
OUTPUT OK Blue On steadily Power supply is functioning normally,
input is occurring, outputs are within
range, and the temperature is within range.
Blinking Power supply has failed.
SELF-TEST (button) – Power supply is in self-test mode.
Label Color State Description
OUTPUT OK
Green On steadily Power supply is inserted and is functioning
normally, input is occurring, outputs are within
range, and the temperature is within range.
Blinking Power supply is not functioning, is starting up, or is
not properly inserted, or airflow is not sufficient.
Label Color State Description
OK Green On steadily Power supply is functioning normally,
input is occurring, outputs are within
range, temperature is within range, and
fans are operational.
FAIL Amber On steadily Power supply has failed.
Label Color State Description
OK Green On steadily Power supply is functioning normally,
input is occurring, outputs are within
range, temperature is within range, and
fans are operational.
FAIL Red On steadily Power supply has failed.
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