Allied Telesis WebSmart AT-FS750/24POE, Руководство по установке

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Chapter 3: Troubleshooting
54
Note
A 1000Base connection may require five to ten seconds to establish
a link.
POE LED is not Green - Powered Device is not Receiving Power
If you attached a powered device (PD) to a port on a AT-FS750/24POE,
the PoE LED for the port should be green. If the device is not receiving
power or the PoE LED is flashing amber, steady amber, or is OFF, do the
following:
ˆ
Check to be sure that the PD is designed to receive power over pins 1,
2, 3, and 6 on the RJ-45 port. This can be verified by reviewing the
device’s documentation or data sheet.
ˆ
Check that the device’s power requirements do not exceed 15.4 W.
This can be verified by reviewing the device’s documentation or data
sheet.
ˆ
Verify that the PD is not faulty
ˆ
Verify that you are using the appropriate category of twisted pair cable:
Category 3 or better for 10 Mbps operation, Category 5/5E for 100
Mbps operations.
ˆ
Verify that the twisted pair cable is not faulty by replacing it with a
known good cable.
ˆ
Use the CLI management software to determine whether PoE is
enabled on the switch and the port. The default setting for PoE is
enabled.
ˆ
Use the management software to determine whether the PoE power
setting for the port has been reduced from the default setting of
15.4 W, to a value below the power requirements of the device.
ˆ
Verify that the power budget on the switch is not being exceeded by
the number of PDs and their load requirements. Refer to “IEEE
802.3af Class vs. Power Levels” on page 28 for the maximum power
supported for each Class.