HP LaserJet Pro 200 color Printer M251nw - Manual (Page 73)

Setting Description
Automatic The print server automatically configures itself for the highest link speed and
communication mode allowed on the network.
10T Half 10 megabytes per second (Mbps), half-duplex operation
10T Full 10 Mbps, full-duplex operation
100TX Half 100 Mbps, half-duplex operation
100TX Full 100 Mbps, full-duplex operation
5. Touch the OK button. The product turns off and then on.
ENWW Configure IP network settings 61