In this context, a frame is typically an entity at the physical layer.

In a way, the Podmaster was right; he controlled the physical layer.

At the physical layer, hubs support little in the way of sophisticated networking.

However, the physical layer needs to communicate with a particular serial port chip.

The idea behind Internet 0 is to provide a general-purpose physical layer that operates well in many media.

Multiplexing is in this context provided by the physical layer.

In general, network protocol stack software will work similarly on all physical layers.

The physical layer is responsible for physical transmission of the data.

With a different physical layer, it is used between the tractor and trailer.

Windows actions which act on disks at the physical layer are not possible.