Technical specification that identifies mechanical and electrical characters of the interface for connecting DTE to DCE. It defines interface circuit functions and their corresponding connector pin assignments. The standard applies to both asynchronous and synchronous serial, binary data transmission at speeds up to 20 kilobits per second (Kbps) in half or full-duplex mode. It defines 20 specific functions, and the physical connection is made through plug-in, 25-pin connectors.

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