Pwr 1 And Pwr 2 Leds - Allied Telesis IS Series Installation Manual

Chapter 6: Troubleshooting

PWR 1 and PWR 2 LEDs

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Problem: A DC power supply is connected to the switch, but the
corresponding PWR 1 or PWR 2 LED on the front panel is off.
Solutions: The unit is not receiving power from the power supply or the
power is outside the operating range of the switch. Try the following:
Verify that the DC power source is powered on and operating

normally.
Review the DC power source's documentation to verify that it is

compatible with the switch. The power supply requirements for the
switch are given in "Power Supplies" on page 39.
Verify that the power/alarm connector is fully inserted into the slot

in the top panel of the switch.
Verify that the DC wires are securely connected to the PWR 1 -

PWR 2 connector terminals on the switch and to the DC power
supply.
Verify that the DC positive and negative wires from the power

supplies are connected to the correct connectors on the DC PWR
1 - PWR 2 connector terminals on the switch.
Try using a different DC power source.

Try replacing the DC power wires.

Try connecting the DC power source to a different device to ensure

that it is working properly.
Test the output voltage from the power source to verify that it is

within the operating range of the switch.