Path: utzoo!utgpu!jarvis.csri.toronto.edu!rutgers!apple!voder!pyramid!csg From: csg@pyramid.pyramid.com (Carl S. Gutekunst) Newsgroups: comp.mail.uucp Subject: Re: Question about UUCP startup Message-ID: <77784@pyramid.pyramid.com> Date: 19 Jul 89 05:01:00 GMT References: <256@escargot.UUCP> <3546@altos86.Altos.COM> Reply-To: csg@pyramid.pyramid.com (Carl S. Gutekunst) Distribution: usa Organization: Pyramid Technology Corp., Mountain View, CA Lines: 45 > e - This is a variation on the 'f' protocol. Probably for use > with Ethernet. 'e' is the "error free" protocol written for the Streams TLI interface of HoneyDanBer UUCP. Peter Honeyman has blamed it on various people from time to time. :-) It requires that the link be error free and 8-bit transparent. > f - This is an X.25 protocol implementation. It assumes that > the channel is error-free. This is a 7-bit printable-ASCII only protocol, allowing in-band flow control, and providing a simple checksum per file. It is specifically for X.29 links, which are considered "mostly error free," but where some kind of end-to-end error detection is required. > t - This protocol was developed for use over flow-controlled > error-free transports such as TCP/IP. Yup. Written by Rick Adams, it is (coincidentally) almost identical to 'e', but never-the-less quite incompatible. Rick has mentioned that he would never have written 't', had he known that 'e' already existed. > x - Also similar to the 'f' protocol. Developed by AT&T, for use > over X.25, but doesn't support checksums. Nothing at all like the 'f' protocol, 'x' requires a completely error free line, 8 bit transparency, and the ability of the network to pass a zero-length data packet end-to-end. As such, it is useless for virtually any application. > z - It is rumored that someone is working on this protocol, to > be used with ZMODEM. Film at 11. Yeah, we'll let you know. :-) Also: d - Datakit. A trivial variant of the 'x' protocol, it adds Datakit- specific setup, end-of-file, and other optimizations. G - Rick Adams' extended 'g' protocol. s - A streaming protocol I am designing, with adaptive encoding and efficient, robust error correction.