Traditional Telnet and TN3270 differ in two main areas:
3270 terminal emulation uses block mode rather than line mode.
3270 terminal emulation uses the EBCDIC character set rather than the ASCII set.
The z/OS server is an EBCDIC character set based platform. Most other non-z/OS platforms
are ASCII character set based. Normal data transmission between these dissimilar platforms
requires character translation processes for each packet of data they exchange. TN3270
provides end-to-end 3270 data stream emulation capability. The client performs any
necessary conversion between ASCII and EBCDIC character sets. ...
Become an O’Reilly member and get unlimited access to this title plus top books and audiobooks from O’Reilly and nearly 200 top publishers, thousands of courses curated by job role, 150+ live events each month, and much more.