All Port Leds Are Off - Allied Telesis AT-9000/12PoE Installation Manual

Allied telesis at-9000 series gigabit ethernet switches installation guide
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Chapter 6: Troubleshooting

All Port LEDs Are Off

If all of the port LEDs are off, even though the ports are connected to
active host devices, the switch may be operating in the low-power mode.
To toggle on the LEDs, press the ecoFriendly button on the front panel of
the switch.
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At-9000/52At-9000/28At-9000/28poeAt-9000/28sp

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