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CHAPTER 4
Intel Express 10/100 Fast Ethernet Switch
General Problems
If you’re having problems with the switch, follow the steps below:
1 Verify that your cables are wired correctly. This is the most
common problem. Use a UTP crossover cable to directly connect
to a repeater or another switch. Use straight-through cables when
connecting to servers or workstations. Try both the MDI and
MDI-X connectors on port 1 if you’re unsure of which cable to
use. See page 8 for more information.
2 Make sure the unit is plugged into a functioning AC outlet. Also,
make sure the voltage setting next to the switch’s power
receptacle is set correctly. In the United States, Canada, and Japan
the setting is 115. In most European and Asian countries, it’s 230.
3 Review the switch’s Link LEDs to ensure the ports you believe
should be functioning are properly configured and not disabled.
Also, review the Link LEDs of other devices to ensure the ports
that should be functioning are properly attached to the switch.
4 Make sure devices connected to the switch are operating at the
same speed as the switch port. Each switch port can be forced to
either 10 or 100 Mbps (although auto-detect is the default). Also,
other devices connected to the switch may be capable of operating
at 10 or 100 Mbps. See page 66 for information on setting speed.
5 If you configured a port for full duplex, make sure the device on
the other end is configured for full duplex and is capable of
transmitting in full duplex. Repeaters/hubs/concentrators can’t
operate in full duplex mode.
6 Make sure the equipment attached to the switch is properly
configured. If the Coll LED is on continuously (and you don’t
have full duplex configured), you may have an adapter problem.
7 Use the Console Manager to check the switch’s status. Use the
sys-stat command to check overall system status and
get-port-cfg to check the status of each port. To monitor traffic,
use the switching statistics commands (see page 25).
8 You can also use a protocol analyzer to check monitor statistics. If
the port is configured in half-duplex mode, place a hub between
the switch and the other device and attach the protocol analyzer to
the hub. If the port is configured in full-duplex mode, place a tap
between the device and switch and then attach a protocol analyzer
to the tap. Contact your network services supplier for information
on protocol analyzers and taps.