EXFO FTB-8500 Series for FTB-500 - Manual (Page 167)

Port Tabs
Ethernet and Fibre Channel Application 153
Advanced Auto-Neg. TX
Configuration
The Speed, Duplex, and Flow Control can be modified only when the
Enable Local Capabilities is disabled.

Speed: Select the speed of the connected interface. Choices are:
For electrical port: 10Mbps, 100Mbps, 1Gbps, and Auto.
For optical port: 1Gbps.

Duplex: Select the duplex mode for the selected port. Choices are:
For 10 Mbps and 100 Mbps speeds (except for BERT and Smart
Loopback tests): Full, Half, and Auto.
For 1Gbps speed, BERT or Smart Loopback: Full.

Flow Control: Select the flow control of the connected interface. The
default setting is None. Choices are:
None: Pause frame received are ignored and no pause frame are
transmitted. None is the only choice for BERT and Smart Loopback
tests.
Asymmetrical: Pause frame can be transmitted but not received.
Symmetrical: Pause frame can be received and transmitted depending
on the link partner (L. P.) flow type (see table below).
Asym. and Sym. (Asymmetrical and Symmetrical): pause frame can be
received and/or transmitted depending on the link partner (L. P.) flow
type (see table below).
Auto: Allows the negotiation of the flow control with the partner port.