![]() ![]() This later gave way to other communication systems, but this was the beginning of the Internet. The typical connection speed was usually 50 baud or 110 baud, though very fast connections could reach 300 baud.Īs a side note, when the very first IMPs (Interconnection Message Processors) that formed the first nodes/routers of ARPAnet (the ancient predecessor of the Internet), this was exactly the connection system they were using. Years ago, when the use of timeshare computing systems was common, the user would dial a telephone, place the telephone's handset against an acoustical modem, and that modem would be connected to a simple dumb terminal with an RS-232 cable. Here, the modem can be thought of as the DCE and the terminal that faces a user is the DTE. This is an instance where the subjects of modems and serial communication equipment have been mixed together. In practice, the distinction between Data Terminal Equipment (DTE) and Data Communications Equipment (DCE) is simply a matter of function. In the world of serial communications, there are two different kinds of equipment: Early RS-232 connections were commonly used to connect terminal equipment to modems, so these topics are often intertwined.ĭata Terminal/Communications Equipment However, a fully implemented connection can contain as many as 25 wires. The simplest connection in common usage contains three wires: transmit (tx), receive (rx), and ground (gnd). At a minimum, an RS-232 connection may consist of a single wire connected between two pieces of equipment. This standard dates back to 1962 but has been substantially revised over the years to accommodate changes to communications technology. RS-232 is a standard for serial data communication between computing equipment. 7 Relationship of Baud Rate to Maximum Distance. ![]() 2 Data Terminal/Communications Equipment.
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