A physical layer network interface module (PHY-NIM) adaptation system provides a PHY-NIM device and an attachable media access control (MAC) device. The PHY-NIM device interconnects with the attachable MAC device and the attachable MAC device interconnects to a network appliance where the network appliance does not have at least one of an internal network switch and a MAC device in a southbridge input/output (I/O) interface chip of the network appliance. The PHY-NIM device interconnects directly to the network appliance without the attachable MAC device where the network appliance has at least one of the internal network switch and the MAC device in the southbridge I/O interface chip of the network appliance.