Allied Telesis AT-IX5-28GPX - Manual (Page 119)

IX5-28GPX Installation Guide
119
Problem 4: A twisted pair port on the switch is connected to a network
device but the port’s LINK/ACT LED is off.
Solutions: The port is unable to establish a link to a network device. Try
the following:
ˆ Verify that the port is connected to the correct twisted pair cable.
This is to eliminate the possibility that the port is connected to the
wrong network device.
ˆ Verify that the network device connected to the twisted pair port is
powered on and is operating properly.
ˆ Try connecting another network device to the twisted pair port with
a different cable. If the twisted pair port is able to establish a link,
then the problem is with the cable or the other network device.
ˆ Verify that the port speed, duplex and MDI settings are valid for the
link partner. The easiest way to do this is to set all these
parameters to auto-negotiate, which is the default setting. Also see
Problem 6.
ˆ Verify that the twisted pair cable does not exceed 100 meters (328
feet).
ˆ Verify that you are using the appropriate category of twisted pair
cable. The cable types are listed in Table 2 on page 24 and
Table 3 on page 25 for the 10/100/1000Base-T ports.
Note
A 1000Base connection may require five to ten seconds to establish
a link.
Problem 5: The LINK/ACT LED for an SFP or SFP+ transceiver is off.
Solutions: The fiber optic port on the transceiver is unable to establish a
link to a network device. Try the following:
ˆ Verify that the remote network device connected to the fiber optic
port is operating properly.
ˆ Verify that the fiber optic cable is securely connected to the port on
the SFP or SFP+ module and to the port on the remote network
device.
ˆ Check that the transceiver is fully inserted in the slot.
ˆ If you are using SFP+ slots 27 and 28, check that VCStack is
disabled on the switch. The VCStack feature has to be disabled
before you can use these slots for regular SFP or SFP+
transceivers. For instructions, refer to “Configuring the Switch for
Stand-alone Operations” on page 78
ˆ Verify that the operating specifications of the fiber optic ports on
the transceiver and remote network device are compatible.