https://app.knowbase.one/vault/rfc/docid/4760
RFC0435: Telnet issues
Network Working Group B. Cosell Request for Comment: 435 BBN-NET NIC: 13675 D. Walden Category: TELNET, Protocols, Echoing BBN-NET Re...
https://app.knowbase.one/vault/rfc/docid/6045
RFC0560: Remote Controlled Transmission and Echoing Telnet option
Network Working Group D. Crocker Request for Comments: 560 J. Postel Category: Protocols, TELNET 20 August 1973 NIC: 18492 Remote Controlled Transmission & Echoing TELNET Optio...