The transport system is a term from the OSI terminology. In the OSI reference model, the OSI architecture distinguishes between the lower four layers
- these are the transport-oriented layers - and the upper three layers, the application-oriented layers. The transport-oriented layers form the transport system, which consists of the transmission medium
withtheir accesses and switching equipment - the bridges, routers, switches, packet and line switches
- that are built on top of the transmission media. Thetransport-oriented layers include
layer, data link
layer, network layer and transport
layer. In the OSI concept, the transport-oriented layers are implemented by access procedures and transport protocols. In contrast, the application-oriented layers, which realize the user system, support with the presentation, the correct syntax of the data and the application protocols.