Hi!

There is nothing configured on the switch-port therefore it should be auto, because the default is auto negotiation.

Normally 100BaseTX is going full duplex and 100 Mbit/s, so why is the phone going down to half duplex?

Begin updating phone firmware.

Hi

First thing to check is whether the phone has been configured for half duplex - this is a setting configured from the phone itself (via the keypad). You can go into 'settings', then 'network configuration' and scroll down until you see the 'PC' and 'SW' port configurations.

If you are not near the phone you can browse to the phone IP with Internet Explorer and then click 'Network Configuration' on the left. Somewhere in that list should be the configured speed/duplex settings.

If it is configured for auto/auto, then I would check that there are not multiple devices on the affected switch port - for example someone may have inserted a hub or other intermediate device.

Aaron

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