RFC 854 was the original rfc number that described telnet. RFC 854 May 1983 applicable even in terminal-to-terminal or process-to-process communications, the "user" host is the host which initiated the communication.
Telnet was developed in 1969 beginning with RFC 15.
Explanation:
It was extended in RFC 855 in 1983, and standardized as Internet Engineering Task Force (IETF) Internet Standard STD 8, one of the first Internet standards.
