What is the YMODEM Protocol?
The YMODEM protocol was developed in the early 1980s by Chuck Forsberg of Omen Technologies. The original intent was to make some simple extensions to the XMODEM protocol to improve performance. YMODEM uses a fixed packet size of 1024 bytes – 8 times the size of XMODEM. Even though it is a half-duplex ACK/NAK protocol, it is significantly faster. Because it uses larger packets, YMODEM spends much less time waiting for a response from the receiver than XMODEM. YMODEM also transmits the file name as part of the file transfer so that it is not necessary to enter a file name of the receiver end of the transmission. Unlike, XMODEM, YMODEM is capable of transmitting the exact file size. Otherwise, YMODEM has same limitations as XMODEM. • What is the YMODEM-G Protocol? YMODEM-G is a variant of YMODEM. YMODEM-G was designed to provide maximum performance over half-duplex modems that guaranteed error-free connections. Old, half-duplex modems were highly efficient at transmitting data in one dir
