Cisco WS-C4928-10GE Installation Guide - Page 72
LED and Color, Meaning, INPUT OK DC
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Identifying Startup Problems Chapter 5 Troubleshooting the Installation Table 5-1 Power Supply LED Meanings LED and Color INPUT OK (AC) Green Red Off INPUT OK (DC) Green Red Off OUTPUT OK Green Meaning This LED should turn green immediately when power is applied to the supply and the power switch is set to ON. AC input voltage is greater than 82 +/-3V. In a dual power supply configuration (alternate unit powered) the AC input is less than 73 +/-3V, or the power supply is turned off. AC input voltage is less than 73 +/-3V, or the power supply is turned off. This LED should turn green immediately when power is applied to the supply. DC input voltage is greater than -38.25 +/-2.25V. In a dual power supply configuration (alternate unit powered) the DC input is less than 33 +/-3V, or the power supply is turned 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. 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 5-4 78-18039-02