Lynx

Lynx is a file transfer protocol for use with modems, and the name of the program that implements the protocol. Lynx is based on a sliding window protocol with two to sixteen packets per window (or "block"), and 64 bytes of data per packet. It also applies run length encoding (RLE) to the data on a per-block basis to compress suitable data. Lynx was developed by Matthew Thomas, who released it as shareware in 1989. The protocol was supported primarily by the Lynx program, and appears to have seen little or no support in bulletin board systems (BBSs) or online services. Techniques The Lynx program was run from the command line to start transfers, there is no documented example of a 3rd party terminal emulator supporting the system. The protocol was relatively simple, largely identical to WXMODEM with the exception that it used fixed-size 64-byte packets in windows of two to sixteen packets, rather than one to four 128-byte packets in WXMODEM. Error recovery was handled by reducing the window size rather than the packet size. CRC-32 was used to detect errors.