Nortel Networks 350 manual Port Interface

Troubleshooting

•If the connected station uses a form of autonegotiation that is not compatible with the IEEE 802.3u autonegotiating standard, the BayStack 350 switch cannot negotiate a compatible mode for correct operation.

•If the autonegotiation feature is not present or is not enabled at the connected station, the BayStack 350 switch may not be able to determine the correct duplex mode.

In both situations, the BayStack 350 switch “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, follow these steps:

1.Use the Port Configuration screen to disable autonegotiation for the suspect port (see “Port Configuration” on page 3-30).

2.Manually set the Speed/Duplex field to match the speed/duplex mode of the connected station (see Table 3-12 on page 3-31).

You may have to try several settings before you find the correct speed/duplex mode of the connected station.

If the problem persists, follow these additional steps:

1.Disable the autonegotiation feature at the connected station.

2.Manually set the speed/duplex mode of the connected station to the same speed/duplex mode you have manually set for the BayStack 350 switch port.

Note: Bay Networks recommends that you manually set the BayStack 350 switch port to the desired speed/duplex mode when connecting to any of the following Bay Networks products:

•Bay Networks 28000 product family

•Bay Networks 58000 product family

•BayStack Model 302T switch (100 Mb/s port)

Port Interface

Ensure that the devices are connected using the appropriate crossover or straight-through cable (see Appendix D, “Connectors and Pin Assignments”).

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