Cisco Systems 4900 Series manual Meaning, Input OK AC

Chapter 5 Troubleshooting the Installation

Identifying Startup Problems

Table 5-1	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 yellow 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.

	Catalyst 4900 Series Switch Installation Guide
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