Skip to Main Content
Transmitting digital data over communication lines is a fundamental requirement in a growing variety of data processing applications. As the kinds of applications have grown, so has the variety of terminal devices, data codes, and communication facilities.
Note: The Institute of Electrical and Electronics Engineers, Incorporated is distributing this Article with permission of the International Business Machines Corporation (IBM) who is the exclusive owner. The recipient of this Article may not assign, sublicense, lease, rent or otherwise transfer, reproduce, prepare derivative works, publicly display or perform, or distribute the Article.