LevelOne FSW-0807TX - Manual (Page 21)

11
Port Speed & Duplex Mode
After plugging the selected cable to a specific port, the system
uses auto-negotiation to determine the transmission mode for
any new twisted-pair connection:
If the attached device does not support auto-negotiation or
has auto-negotiation disabled, an auto-sensing process is
initiated to select the speed and set the duplex mode to half-
duplex.