What is the Physical Layer Protocol, and what is the interface? What is the difference and is it?

In one of the sources read> Physical interface is determined by a set of electrical connections and characteristics of signals. The interface sets the parameters, procedures and characteristics of the interaction of objects.

Other source> The physical protocol is determined by the characteristics of the communication channels, signals and port connectors.

Those. When communicating computer to computer, the communication channel and the characteristics of the transmitted signals is a protocol, an interface or all together?

Explain, please. thank

  • I think OSI will help you figure it out :) - nobody

2 answers 2

The interface is the actual implementation of the protocol.

A protocol is a description of how the interface should be arranged.

  • According to the textbook, which I go through at the interface, there can also be different implementations, and the protocol implements the so-called "protocol entities". I understand the protocol as a virtual connection between two peers, and the interface is direct (without intermediate levels), but in the case of the physical layer, these concepts are layered. - dontryme

A protocol may include several interfaces. If in the case of communication between two computers, the interface can be an interface card, its port, a channel between two computers and a signal characteristic of this channel, then in the case of a physical layer protocol, it includes all of this at once (the combination of all this is the protocol)