Xref: utzoo comp.dcom.modems:2529 comp.mail.uucp:1978 Path: utzoo!attcan!uunet!seismo!sundc!pitstop!sun!rayssd!galaxia!dave From: dave@galaxia.zone1.com (David H. Brierley) Newsgroups: comp.dcom.modems,comp.mail.uucp Subject: Re: UUCP g stats Message-ID: <514@galaxia.zone1.com> Date: 27 Sep 88 05:11:19 GMT References: <183@arnold.UUCP> <1988Sep20.184054.2403@utzoo.uucp> <184@arnold.UUCP> Reply-To: dave@galaxia.zone1.com (David H. Brierley) Organization: Dave's Very Own Personal System Lines: 34 In article <184@arnold.UUCP> dave@arnold.UUCP (Dave Arnold) writes: >(Henry Spencer) writes: >> In article <183@arnold.UUCP> dave@arnold.UUCP (Dave Arnold) writes: >> >seeing about 450cps, is something wrong, or is this average? >> >> negligible -- they are substantial.) Uucp-g can run a line at circa 90% > >I have never seen 90% bandwidth utilization. My 3B1 at home running >at 1200 baud always gets around 100-120 cps. How are you computing > >(c * 8) / b >where b = baud and c = chars. per second? Dave, I dont want to sound demeaning but is your brain in a holding pattern today? The "baud rate" is not computed by multiplying the cps value by 8. It is true that the baud rate represents the number of bits that flow through the line each second but for every data byte you send there are more than 8 bits. Each data byte is preceeded by (usually) 1 start bit and is then followed by either 1 or 2 stop bits, thus making either 10 or 11 bits of info for each data byte sent. Most people configure their modems for one stop bit and can therefore make the simple approximation of CPS = BAUD / 10. Using that formula you will see that 90% of a 1200 baud line is 108 CPS. If you are getting between 100 and 120 cps then you are doing pretty good. The data rate that you can achieve is very dependent on the machine you are using. For example: I have two machines (VAX 11/78x) that are connected via a dedicated 9600 baud line and I typically see between 400 and 600 cps. I have two other machines that talk to each other through a micom data switch at 9600 baud and I consistently see between 700 and 800 cps. Several of our 9600 baud trailblazer links are capable of hitting 800+ cps if I send them enough data to overcome the startup overhead. -- David H. Brierley Home: dave@galaxia.zone1.com ...!rayssd!galaxia!dave Work: dhb@rayssd.ray.com {sun,decuac,gatech,necntc,ukma}!rayssd!dhb