Allied Telesis AT-2973SX, AT-2973T, AT-2973T/4 - page 39

AT-2973SX, AT-2973T, and AT-2973T/4 NetExtreme II Family Adapters Installation and User’s Guide
39
After you connect the system to the network and power is supplied, the
AT-2973SX, AT-2973T, and AT-2973T/4 adapters attempt to establish
the connection at 1000 Mbps in full-duplex mode.