What is physical layer?

Answer 1

In the Open Systems Interconnection (OSI)communications model, the physical layer supports the electrical or mechanical interface to the physical medium. For example, this layer determines how to put a stream of bits from the upper (data link) layer on to the pins for a parallel printer interface, an optical fiber transmitter, or a radio carrier. The physical layer is usually a combination of software and hardware programming and may include electromechanical devices. It does not include the physical media as such.

Answer 2

In terms of science, the function of the physical layer is to hold materials contained within in until the next layer is reached. The five physical layers of Earth are the inner core, outer core, lower mantle, upper mantle, and crust.

Answer 3

The physical layer is the first layer of the OSI model, responsible for transmitting raw data bits over a physical medium such as cables or wireless signals. It deals primarily with the physical connection between devices and the transmission of electrical, optical, or radio signals. Examples of physical layer components include cables, connectors, hubs, and network interface cards.