HP ProCurve 6120G/XG Installation And Getting Started Manual page 36

Diagnosing the 6120XG with the LEDs
Tip Problem
➌
The network connection is not
working properly.
28
Try the following procedures:
• Verify the transceiver is of a supported type.
• Verify the OA port configurations for the downlink ports to the server are correct.
• For the indicated port, verify both ends of the cabling, at the switch and the connected device,
are connected properly.
• Verify the connected device and switch are both powered on and operating correctly.
• Verify you have used the correct cable type for the connection:
– For twisted-pair connections to the fixed 10/100 or 10/100/1000 ports, if the port is
configured to "Auto" (auto negotiate), either straight-through or crossover cables can
be used because of the switch's "HP Auto-MDIX" feature and the Auto MDI/MDI-X
feature of the 10/100/1000-T port.
Note: If the switch port configuration is changed to one of the fixed configuration options
(for example, 100 Mbps/Full Duplex), then the port operates as MDI-X only and you must
use the correct type of cable for the connection. In general, for connecting an end node
(MDI port) to the switch, use straight-through cable; for connecting to MDI-X ports on
hubs, other switches, and routers, use crossover cable.
– For fiber-optic connections, verify the transmit port on the switch is connected to the
receive port on the connected device, and the switch receive port is connected to the
transmit port on the connected device.
• For 1000Base-T connections, verify that the network cabling complies with the IEEE 802.3ab
standard. the cable should be installed according to the ANSI/TIA/EIA-568-
A-5 specifications. Cable testing should comply with the stated limitations for Attenuation,
Near-End Crosstalk, Far-End Crosstalk, Equal-Level Far-End Crosstalk (ELFEXT), Multiple
Disturber ELFEXT, and Return Loss.
The cable verification process must include all patch cables from any end devices, including
the switch, to any patch panels in the cabling path.
• Verify the 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 ProCurve Manager network management software to
determine the state of the port and re-enable the port if necessary.
• Verify 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.
If the other procedures don't resolve the problem, try using a different port or a different cable.
Solution