Allied Telesis CentreCOM GS980M/52 Handbuch zur Schnellinstallation - Seite 19
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Problem: All of the port LEDs are off even though the ports are
connected to active network devices.
Solution: The switch might be operating in the low power mode. To
toggle on the LEDs, press the eco-friendly button on the front panel
of the switch. You can also toggle the LEDs off and on with the
ECOFRIENDLY LED and NO ECOFRIENDLY LED commands in the
command line interface.
Problem: A LINK/ACT LED is off for a Ethernet copper port that is
connected to an active network device.
Solutions: The port is unable to establish a link to a network device.
Try the following:
Verify that the network device connected to the Ethernet copper
port is powered on and is operating properly.
Verify that the port is connected to the correct Ethernet copper
cable.
Problem: The LINK/ACT LED is off for an SFP transceiver that is
connected to an active network device.
Solutions: The fiber optic port on the transceiver is unable to
establish a link to a network device. Try the following:
Verify that the fiber optic cable is securely connected to the port
on the transceiver and to the port on the remote network device.
Check that the transceiver is fully inserted in the slot.
Problem: A port on the GS980M/52PS Switch is not providing power
to a PoE+ device.
Solutions: Try the following:
Check the port's PoE LED. Refer to "Ethernet Copper Port LEDs"
on page 14. If the LED is flashing amber, the switch cannot
support additional PoE devices device because it is already
providing its maximum power to other devices. The maximum
power budget for the switch is 740W.
Review the powered device's documentation to confirm that the
device supports Mode A of the IEEE 802.3at standard and that it
uses pins 1, 2, 3, and 6 on the RJ-45 port to receive power.
Check that the device's power requirements do not exceed
25.5W by reviewing its documentation or data sheet.
CentreCOM GS980M Series Quick Installation Guide
19