sorry i didnt get please. if it is a single wire where belongs the 7 layer ?
Its Application layer.
Provides a means for the user to access information on the network through an application. This layer is the main interface for the user to interact with the application and therefore the network.
The application layer is the OSI layer closest to the end user, which means that both the OSI application layer and the user interact directly with the software application. This layer interacts with software applications that implement a communicating component. Such application programs fall outside the scope of the OSI model. Application layer functions typically include identifying communication partners, determining resource availability, and synchronizing communication. When identifying communication partners, the application layer determines the identity and availability of communication partners for an application with data to transmit. When determining resource availability, the application layer must decide whether sufficient network resources for the requested communication exist. In synchronizing communication, all communication between applications requires cooperation that is managed by the application layer.
Some examples of application layer implementations include Telnet, File Transfer Protocol (FTP), and Simple Mail Transfer Protocol (SMTP).
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In Data Link Layer is MAC address located.
Medium Access Control (MAC) defines who can use the network when multiple computers are trying to access it simultaneously
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Network layer is responsible for the routing of data (packets) through the network. It handles the addressing and delivery of data.
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RS-232 is also in physical layer, like as X.21, EIA 232, and G730.