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

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.

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

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.

Table 57 describes the functions of the M20 router power supply LEDs.

Table 57: M20 Router Power Supply LEDs

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.

Table 58 describes the functions of the M40 router power supply LEDs.

Table 58: M40 Router Power Supply LEDs

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.

Table 59 describes the functions of the M40e router AC power supply LED.

Table 59: M40e Router AC Power Supply LED

Label	Color	State	Description
OUTPUT OK	Green	On steadily	Power supply is inserted and is functioning normally.
		Blinking slowly	Power supply is not plugged in, or power switch is in the off position (when other AC power supply is functioning).
		Blinking rapidly	Power supply is starting up.

Table 60 describes the functions of the M40e router DC power supply LEDs.

Table 60: M40e Router DC Power Supply LEDs

Label	Color	State	Description
CB ON	Green	On steadily	Power supply is inserted correctly and is receiving power. Circuit breaker is on.
OUTPUT OK	Blue	On steadily	Power supply is inserted and is functioning normally.
		Blinking	Power supply is not functioning, is starting up, is not properly inserted, or airflow is not sufficient.
CB OFF	Amber	On steadily	Power supply is functioning, but the circuit breaker is off.

Table 61 describes the functions of the M160 router DC power supply LEDs.

Table 61: M160 Router Power Supply LEDs

LED	Color	State	Description
CB ON	Green	On steadily	Power supply is inserted correctly and is receiving power. Circuit breaker is on.
OUTPUT OK	Blue	On steadily	Power supply is inserted and is functioning normally.
		Blinking	Power supply is not functioning, is going through startup, is not properly inserted, or airflow is not sufficient.
		Off	Power supply is not functioning.
NO AIRFLOW (Original power supply only)	Amber	On steadily	Power supply is inserted, but airflow around the power supply is not sufficient.
CB OFF	Amber	On steadily	Power supply is functioning, but the circuit breaker is off.

Table 62 describes the functions of the M320 router AC and DC power supply LED.

Table 62: M320 Router AC/DC Power Supply LED

Label	Color	State	Description
OUTPUT OK	Blue	Off	No power applied to power supply.
		Blinking	Power supply blinks for 5 seconds after initial power on. Power supply is installed, but not powered on, and is receiving bias power from a proword on power supply. Input voltage is invalid Power supply has failed.
		On steadily	Power supply is functioning normally.

Table 63 describes the functions of the M320 router AC and DC power supply LED.

Table 63: T320 Router DC Power Supply LED

Label	Color	State	Description
DC OK	Blue	On steadily	Power supply is installed correctly and is functioning normally.
		Blinking	Power supply is starting up, is not functioning, or is not properly installed.

Table 64 describes the functions of the T640 routing node DC power supply LEDs.

Table 64: T640 Routing Node Power Supply LEDs

LED	Color	State	Description
CB ON	Green	On steadily	Power supply is installed correctly and is functioning normally, is receiving power, and the circuit breaker is on.
CB TRIP	Amber	On steadily	Circuit breaker not turned on, or host subsystem has detected a failure and has turned the circuit breaker off.
OVER TEMP	Amber	On steadily	Power supply has exceeded the recommended temperature.
DC OK	Blue	On steadily	Power supply is installed correctly and is functioning normally.
		Blinking	Power supply is starting up, is not functioning, or is not properly installed.

Alternative Actions

For M40e and M160 routers, if all LEDs are off on both power supplies, either someone has switched off power to the router or the system temperature has exceeded the acceptable maximum. The host module shuts down both power supplies. There is no power to the router, so the alarm LEDs on the craft interface are not lit and the LCD display is blank.

Excessive system temperature is almost always caused by excessive environmental temperature. Correct the environmental temperature before repowering the router.

If all LEDs on one power supply are off, but the LEDs on the other supply indicate that it is functioning properly, or the LEDs on both power supplies indicate a problem, do the following:

1. Check the current alarms by using the show chassis alarms CLI command or by looking at the router craft interface.
2. Check that the power switch is in the ON (|) position (on the circuit breaker box for a DC-powered router, or on the power supply faceplate for an AC-powered router).
3. Perform a swap test on the power supplies (see Perform a Power Supply Swap Test).