Port Interface - Nortel 325-24T Configuration Manual

408 Chapter 13 Troubleshooting
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In both situations, the Ethernet Switch 325/425 "autosenses" the speed of the
connected station and, by default, reverts to half-duplex mode. If the connected
station is operating in full-duplex mode, it cannot communicate with the switch.
To correct this mode mismatch problem:
1
2
If the problem persists:
1
2

Port interface

Ensure that the devices are connected using the appropriate crossover or
straight-through cable (see
page
320985-A Rev 01
If the connected station uses a form of autonegotiation that is not compatible
with the IEEE 802.3u autonegotiating standard, the Ethernet Switch 325/425
cannot negotiate a compatible mode for correct operation.
If the autonegotiation feature is not present or not enabled at the connected
station, the Ethernet Switch 325/425 may not be able to determine the correct
duplex modes.
Use the Port Configuration screen to disable autonegotiation for the suspect
port (see "Port Configuration screen" on page
Manually set the Speed/Duplex field to match the speed/duplex mode of the
connected station.
You may have to try several settings before you find the correct speed/duplex
mode of the connected station.
Disable the autonegotiation feature at the connected station.
Manually set the speed/duplex mode of the connected station to the same
speed/duplex mode you have manually set for the Ethernet Switch 325/425
port.
425), or that autonegotiation is active.
Appendix B, "Connectors and pin assignments," on
109).