Allied Telesis AT-2746FX - Manual (Page 131)

Network Adapter Card Installation Guide
131
Configuring the Network Adapter Card
To configure the speed and duplex of the adapter, go to the following file
and configure the speed_duplex parameter to the desired value:
/kernel/drv/ae.conf
Possible values for the speed_duplex parameter are:
0 - Auto Negotiation
1 - 100Mb/half duplex
2 - 100Mb/full duplex
3 - 10Mb/half duplex
4 - 10Mb/full duplex
5 - Hardware
Note
Since a fiber optic port does not support Auto-Negotiation, the
setting “0” is inappropriate when configuring that type of port. To
configure a fiber optic port, select the appropriate speed and duplex
mode setting (1 to 4).