jeffery@jsheese.FIDONET.ORG (Jeff Sheese) (05/21/89)
In an article of <20 May 89 06:55:02 GMT>, scott@clmqt.UUCP (Scott Reynolds) writes: >My xferstats file shows some interesting figures. On a direct dial 2400 >baud connection, average transfer rate (for files of at least 5K or >bigger) is 193 cps. On a clean line, G will actually do up to about 222 >cps, believe it or not! Compare this to my best ZModem times of 231 cps >and not one character higher, ever. I average 226 cps on ZModem transfers. >On a 1200 baud connection through a packet switched network to an >Internet gateway to the host, I get 93 cps on average. Best conditions >yield up to about 109 cps, but that happens extremely rarely. Using Binkleyterm (a Fidonet mailer for MSDOS machines - read *not* IBM dependant) I average around 235-240 cps at 2400 baud. It has it's own bult-in zmodem implementation. Source code is available from choice Fidonet systems. Send mail if interested, I can tell you where to find it or even post the source to c.b.i.p. It's a mailer program that supports file attaches, file requests, even file update requests. It's really remarkable what features it supports. Since it's written in C it could very easily be ported to *nix. It uses the FOSSIL concept, which really is a method of using medium level calls to a communications interface written solely for the hardware your using. FOSSIL specs are public domain. >G is indeed streaming (watch it go when you are connected through a >packet network if you don't believe me) but the one thing that really >slows it down is poor error recovery. If in mid transfer a block is short >a few characters, the receiver will time out after a fairly long period >of time. For sure. If I turn my modem off during a D.* transfer, the next time I make the uucp connection the whole thing is transferred again. Now G may be the basic downward compatible standard of Usenet, but the gurus aught to consider zmodem in a few experimental implementations. I've used bimodem a few times, which allows for zmodem bidirectional transfers. Imagine, transferring all your mail to it's destination while getting the mail/news from the same site at the same time. -- Jeff Sheese - via FidoNet node 1:109/116 UUCP: ...!netsys!jsheese!jeffery ARPA: jeffery@jsheese.FIDONET.ORG (I am sole owner. My opinions represent my company.) (Send all flames to null@jsheese.Fidonet.ORG)
benton@VAX1.CC.UAKRON.EDU (Kevin Benton) (05/24/89)
In article <112.2475C03A@jsheese.FIDONET.ORG> jeffery@jsheese.Fidonet.ORG writes: >In an article of <20 May 89 06:55:02 GMT>, scott@clmqt.UUCP (Scott Reynolds) >writes: > > >My xferstats file shows some interesting figures. On a direct dial 2400 > >baud connection, average transfer rate (for files of at least 5K or > >bigger) is 193 cps. On a clean line, G will actually do up to about 222 > >cps, believe it or not! Compare this to my best ZModem times of 231 cps >Using Binkleyterm (a Fidonet mailer for MSDOS machines - read *not* IBM >dependant) I average around 235-240 cps at 2400 baud. It has it's own bult-in >zmodem implementation. Source code is available from choice Fidonet systems. >Send mail if interested, I can tell you where to find it or even post the <much removed> If someone will send me a copy of a public domain uucp with source, that is well commented, I'd be happy to add a Z protocol, and a "K" protocol, one of my own bi-directional protocols that basically runs Zmodem both ways, but but somewhat better than bi-modem. kb