Connecting Modems and Terminals
Most Unix platforms offer powerful serial connections that support both modem and terminal services, such as remote login and file transfer services. A properly wired and configured serial interface is a basic requirement that is common to both types of services.
The standard interface used to perform external modems/terminal connections is RS232C/D. It defines the interface between DTE and DCE. In practical terms, and for the purposes of this section, this means that it defines the physical interface between a computer that is the Data Terminal Equipment (the DTE) and the modem that is the Data Communication Equipment (the DCE). It also defines the connection between two DTEs.
NOTE
The RS232C/D standard interface ...
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