Cisco Systems ME 4924-10GE manual LED Readings, LED and Color Meaning

Chapter 4 Troubleshooting

Troubleshooting the Hardware Components

LED Readings

LEDs indicate all system states in the startup sequence. By checking the LEDs, you can determine when and where the system failed in the startup sequence. To check the LEDs, follow these steps:

Step 1 Compare the LED states to Table 4-2:

Table 4-2 Power Supply LED Meanings

LED and Color	Meaning
INPUT OK (AC)	This LED should turn green immediately when power is
	applied to the supply and the power switch is set to ON.
Green	AC input voltage is greater than 82 +/-3V.
Red	In a dual power supply configuration (alternate unit
	powered) the AC input is less than 73 +/-3V, or the power
	supply is turned off.
Off	AC input voltage is less than 73 +/-3V, or the power supply
	is turned off.
INPUT OK (DC)	This LED should turn green immediately when power is
	applied to the supply.
Green	DC input voltage is greater than -38.25 +/-2.25V.
Red	In a dual power supply configuration (alternate unit
	powered) the DC input is less than 33 +/-3V, or the power
	supply is turned off.
Off	In a single supply configuration, the LED shall be off to
	signal that DC input is less than 33 +/-3V, or the power
	supply is turned off.
OUTPUT OK
Green	DC output voltages are within the normal operating range.
Red	Output voltage between the minimum and maximum limits
	will not create an output fail alarm. Output voltages below
	the minimum or above the maximum will create an output
	fail alarm and cause the LED to illuminate red.

Step 2 Verify that the LEDs on the front panel are lit:

•The STATUS LED flashes amber during diagnostic boot tests. It is green when the switch is operational (online). If the system software is unable to start up, this LED stays orange.

•The port LEDs (1-48) are green when the module is operational (online). If no signal is detected, the LINK LED is off. The port LED remains amber if the port is disabled. The port LED flashes amber if the port tested faulty at startup.

Step 3 If a STATUS LED is red, contact a customer service representative for instructions.

Step 4 If the boot information and system banner are not displayed, verify that the terminal is set correctly and that it is connected properly to the console port.

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