Allied Telesis AT-FS724 - Manual (Page 45)

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❑ If the port is Disabled , someone has manually disabled the
port for a specific reason. Verify that the reason no longer
exists before you enable this port.
5. Verify that the Link LED is On. For the AT-FS718 with the AT-A11,
the transmit pair must be connected to the receive pair on the
attached device. If the Link LED is Off, reverse the transmit and
receive pair at the attached device.
6. Contact Allied Telesyn Technical Support for help.
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If there is no power to the switch, it cannot function.
A POWER LED that is off may indicate:
❑ A loose power cord.
❑ Power supply failure, malfunction, or loss of power to the
power supply.
❑ A power supply voltage below acceptable levels.
❑ A high switch temperature due to fan failure or ambient
temperature extreme.
Perform the following steps in sequence; you need not proceed to
the next step if the problem is resolved:
1. Secure the power cord to the power source and check the POWER
LED to see if it is on.
2. Ensure that the voltage is within the required levels in your region.
3. Contact Allied Telesyn Technical Support for help.
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This might indicate a problem with the switch, such as:
❑ Power-on diagnostics has failed
Perform the following steps in sequence; you need not proceed to
the next step if the problem is resolved:
1. Reset the switch by pressing the RESET button on the front panel.
2. Make sure the RS232 connection from the local terminal or PC to
the switch is secure; change the cable if necessary.
3. Unplug the switch from the power source, then plug it back in
again.
4. Contact Allied Telesyn Technical Support for help.