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AT-8500 Series Layer 2+ Fast Ethernet Switches Installation Guide
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example, you cannot connect a fiber optic port with a maximum
distance of 40 kilometers (24.8 miles) and an operating wavelength of
1550 nm to a remote fiber optic port with an maximum distance of only
2 kilometers (1.24 miles) and a wavelength of 1310 nm.
Check to be sure that the fiber optic ports on the switch and on the end
node are operating at the same speed and duplex mode.
AT-8550GB and AT-8550SP switches only — Verify that the GBIC
module or SFP module is completely inserted into the expansion slot
on the front of the switch.
A 1000Base connection can take from five to ten seconds to
establish a link.
PoE Device is Not Receiving Power
If you attached a powered device to a port on an AT-8524POE, the PoE
LED for the port should be green. (Remember to use the Mode Select
button to toggle the Mode LEDs to the PoE state.) If the device is not
receiving power or the PoE LED is flashing amber, steady amber, or is
OFF, do the following:
Check to be sure that the powered device 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.
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.
Verify that the twisted pair cable is Category 5 or 5E.
Verify that the twisted pair cable is not faulty.
Use the AT-S62 management software to determine whether PoE is
enabled on the switch and the port. The default setting for PoE is
enabled.
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.
PoE is not supported on expansion modules.
Verify that the power budget on the switch is not being exceeded by
the powered devices. This should not be a problem for the
AT-8524POE switch, which can support powered devices on all ports 1
to 24, even when all devices require the maximum of 15.4 W.
Fault LED is On Continuously