Path: utzoo!utgpu!news-server.csri.toronto.edu!rpi!think.com!spool.mu.edu!uunet!overload!dillon From: dillon@overload.Berkeley.CA.US (Matthew Dillon) Newsgroups: comp.sys.amiga.datacomm Subject: Re: A 9600 baud modem for $169!!! Message-ID: Date: 23 Jun 91 17:51:42 GMT Article-I.D.: overload.dillon.8997 References: <29138@know.pws.bull.com> <9149@ucdavis.ucdavis.edu> <9154@ucdavis.ucdavis.edu> Organization: Not an Organization Lines: 40 In article bruce@zuhause.MN.ORG (Bruce Albrecht) writes: >>full-duplex 9600 bps is just about the dumbest thing I ever heard of. >>Anyone who NEEDS to send AND receive at full speed (as opposed to >>1 9600 bps and 1 450 bps channel) please respond. I'd be glad to hear >>what all that extra technology is being used for. > >If UUCP and other communications programs where smart enough, you'd be sending >data both directions at 9600 baud, and include packet acknowledgements as part >the packet headers. Actually, since V.32 modems set to synchronous mode, they can >be used with X.25 to do exactly that. Actually, UUCP does use piggy-backed ACKs, but since file transfers only occur in one direction at once they are pretty useless, only used during a turn-around, and not implemented properly in ports of UUCP G (specifically, they blow up a trailblazer in spoofing mode and most PC UUCPs) >Tymnet (now BT Tymnet) developed a protocol based on X.25 called X.PC around >1983 which allows up to 15 independent channels over a serial line. If people >supported this for BBSs, you'd be able to upload, download, and read mail >simulatneously with only a slight amount of overhead. Although most traffic >seems to be one-way, I'm sure people would be willing to change if something >like X.PC became widely used. > >-- > >bruce@zuhause.mn.org I'd have to look at the X.PC spec, if they put it through the grinder just to make it work on PCs without multitasking it probably isn't worth it. If it sticks to X.25 it probably is worth it. -Matt -- Matthew Dillon dillon@Overload.Berkeley.CA.US 891 Regal Rd. uunet.uu.net!overload!dillon Berkeley, Ca. 94708 USA