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Telnet
Similar to TN3270, Telnet provides the ability to interactively connect to a remote host (e.g.; "logon/login"). Telnet, unlike TN3270, uses a line-mode display mechanism that sends and receives single lines of data, usually text, and displays only one new line of data at a time. This is analogous to some (Internet Relay) Chat clients used to communicate with others in real-time, albeit one line at a time. In most cases, Telnet cannot be used to access 3270 applications that do not communicate in line-mode, such as CICS. While VM/CMS does provide a line-mode logon interface, its severe limitations are no longer necessary to live with, with the proliferation of TN3270 clients. Hence - Telnet is not used to connect to an IBM mainframe.
The Digital Equipment Corporation (DEC) standards for Telnet devices, or "terminals", are the predominant standards in the computing industry today for line-mode terminals. The most widely used Telnet standard is the (DEC) VT100 (terminal), and is the recommended choice when setting up a Telnet client. Most Internet hosts offering, or requiring, interactive logons will expect or provide for VT100 terminal definitions.