EXFO FTB-8500 Series for FTB-500 - Manual (Page 155)

Port Tabs
Ethernet and Fibre Channel Application 141
Interface Setup (Ethernet)

Enable Auto-Negotiation (Not available on FTB-8510G)
The Auto-Negotiation should be selected if the remote connected port
is also set to Auto-Negotiation, otherwise it should be deactivated.
When selected, the Ethernet and Fibre Channel Application will
indicate to the remote port which parameters to use. Auto-Negotiation
is not available with the optical 100Mbps and 10Gbps interfaces. The
Auto-Negotiation check box is selected by default.
When the Enable Auto-Negotiation check box is cleared, the port
Speed, Duplex and Flow Control can be set to specific values. Those
values are applied immediately to the port.
When the Auto-Negotiation check box is selected, the port Speed,
Duplex and Flow Control can be set. Those settings are not applied
immediately to the port, they will be used only when the negotiation
process is started and will take effect only when the auto-negotiation
succeeds. However current settings are applied immediately to the
port when the Auto-Negotiation check box is cleared.

Speed (Not available on FTB-8510G)
Select the speed of the connected interface. Choices are:
For electrical port: 10Mbps, 100Mbps, and 1Gbps.
For optical port: 100Mbps, and 1Gbps. Auto-Negotiation is not
supported when 100Mbps optical speed is selected.
Note: Only enabled speeds are listed. Refer to Software Options on page 378 for
more information.

Duplex (Not available on FTB-8510G)
Select the duplex mode for the selected port. Choices are Full and
Half. However, Half duplex is only available for RFC 2544, Frame
Analyzer, and TCP Throughput tests on the 10 Mbps and 100 Mbps
interfaces.