#Tcp ip over serial ppp serial
#Tcp ip over serial ppp mac

This is somewhat quite literal with the data itself, you have the payload at the highest layer you are working with, then you literally add a header out front and sometimes a footer at the end. You start with the data you want to move then you add layers to the onion around it as you work from the upper osi layers down to the physical layer, you move that onion across, then you start peeling the layers back off. Inside the tcp packet you might have some other data, audio or web page data or ftp data, etc. Then within the ip cardboard box you might have another box, the tcp packet. Then inside a vehicle you might have a box, the ip layer for example, or arp or netbeui or novell, etc.

#Tcp ip over serial ppp mac

Then you have various kinds of frames, cars and trucks, hondas vs fords, mac vs kenworth. That is the highway, just like having cement vs asphalt vs steel mesh over a bridge. You have a physical layer, some way, electrically, through light through the air (laser, etc), wirelessly through the air (wifi, bluetooth, etc), wired, optical through fiber. You might have a truck on that highway with a wooden crate in that crate are some/many cardboard boxes, those boxes might contain other boxes, and in those boxes you might have a lot of the same or different kinds of products. People obviously, but also packages or boxes. Think of a highway, then on that highway you have various sizes and types of vehicles.

#Tcp ip over serial ppp serial

Officially can be implemented over TCP/IP or over a serial bus, Modbus is high level protocol and TCP/IP (for example) can be implemented even over carrier pigeonĬrasic showed the OSI layers. Modbus is a standard that only defines a common high level (OSI 7) protocol but leaves the physical details undefined ( implementation). Both of these standards dictate the physical serial bus (with voltage levels and timing details) behind the communication scheme (that could be ModBus or a proprietary printer peripheral comm protocol)

RS232 is a standard that defines a physical communication scheme using a serial connection. A general picture of this difference is given in the OSI model, where every layer can use whatever communication scheme they choose independent of each other serial data over a parallel link that shifts a byte at a time instead of a bit) so its important to distinguish between the two. Commonly 'serial' is used to refer to a number of buses that were generally available on PC/AT and compatibles via the 'COM' port, generally RS232 and RS485 are included.Ĭonfusingly both the physical interface and the protocol could use a serial communication scheme, or they could be different (e.g.

That is, the chips on either end of the cable/wire use a sequential sequence of bits to exchange data. In the context of your question, serial is used as both a communication scheme and a description of the physical bus. There are a number of compatible and incompatible computer buses and protocols that use a serial communications. Serial is a general communications scheme, where information (in this case binary data) is transmitted in pieces sequentially.