![]() TN3270E provides end-to-end 3270 data stream emulation capability. ![]() The character set of these display systems is the EBCDIC character set rather than the ASCII set.Īs the world went to TCPIP-based networks, a need to continue communicating to large-scale systems emerged. The display unit was attached to a control unit via coaxial cable. There were also displays capable of various combinations of columns and rows as well as color displays. The basic display screen was capable of 24 rows of text by 80 columns also came with a keyboard attached. A 3270 terminal was a non-programmable (sometimes called "dumb") workstation. Supporting these networks was the Virtual Telecommunications Access Method (VTAM®) which is still in use today. At the user's, location in an SNA® network was a device referred to as a 3270 terminal. The display management protocol used to facilitate this communication within an SNA® environment was called the 3270 data stream. ![]() These SNA® networks were used to communicate between remote users and the centralized mainframe. Before the Internet Protocol's rise in popularity, large organizations established their own Systems Network Architecture (SNA®) networks.
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