HP Procurve J4131B Installation Manual page 14

xcvrs_3-2002.fm Page 11 Tuesday, April 2, 2002 3:23 PM
Troubleshooting
The following problems may exist:
The Link LED for the transceiver is not on, even though the transceiver


is receiving power and the network cable is connected. Check the
following:
• Verify that the networked device at the other end of the cable is powered
on and operating correctly.
• Verify that the cables are connected correctly to the transceiver ports. See
step 3 in the installation instructions.
• Verify that the cable length does not exceed the maximum distances listed
on page 5 and that the cables comply with the specifications on that page.
• Check all cabling and connections (including patch panels) to make sure
that all connections are secure, no connectors are damaged, and that none
of the connectors have a dust buildup or other object in the way that may
cause interference to the light transmission or electrical connections. If all
connections are OK, try a different cable.
• Verify that the networked device connected to the transceiver is the correct
type for the transceiver used.
• Verify that the transceiver is supported by the switch or module into which
you are installing it. See the information on page 2 to identify which
transceivers are supported by which network devices.
• If the transceiver is installed in a Series 2300 or Series 2500 Switch, try
resetting or cycling power (turn the power off and then back on) on the
switch. Resetting the switch causes a complete self test to be performed,
which also tests the transceivers. If the transceiver is installed in a Series
4100GL switch, try removing and reinstalling the module in which the
transceiver is installed. This will invoke the most complete self test of the
transceiver, without needing to power cycle the switch.
• Verify that the transceiver port has not been disabled through a switch
configuration change. You can use the console interface, or, if you have
configured an IP address on the switch, use the web browser interface, or
HP TopTools for Hubs & Switches network management software to
determine the state of the port and re-enable the port if necessary.
• Verify that the switch port configuration matches the configuration of
the attached device. For example, if the switch port is configured as
"Auto", the port on the attached device also MUST be configured as
"Auto". Depending on the port type, twisted-pair or fiber-optic, if the
configurations don't match, the results could be a very unreliable
connection, or no link at all.
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