Path: utzoo!attcan!uunet!lll-winken!lll-lcc!ames!ncar!oddjob!uwvax!umn-d-ub!umn-cs!mmm!ems!datapg!sewilco
From: sewilco@datapg.DataPg.MN.ORG (Scot E. Wilcoxon)
Newsgroups: comp.dcom.modems
Subject: Re: BYTE high speed modem article and the Telcor Accelerator 2496MA
Message-ID: <989@datapg.DataPg.MN.ORG>
Date: 6 Jun 88 08:41:10 GMT
References: <12997@shemp.CS.UCLA.EDU> <1711@looking.UUCP> <431@dmk3b1.UUCP>
Reply-To: sewilco@datapg.DataPg.MN.ORG (Scot E. Wilcoxon)
Followup-To: comp.dcom.modems
Organization: Data Progress, Minneapolis, MN
Lines: 16

In article <431@dmk3b1.UUCP> dmk@dmk3b1.UUCP (David Keaton) writes:
>One thing that caught my eye in the Byte article was the pair of graphs
>where one modem fell off a cliff when the signal to noise ratio got bad,
>and a PEP modem took a wild path down to zero throughput.  Their
>explanation about how the PEP modem had to retrain at various noise
>levels doesn't quite make sense to me unless the modem had to readjust
>which frequencies it was using.  In other words, we were probably seeing
...

The BYTE article did not mention the elapsed time of the test.  The
graph seems to have throughput peaks which are too jagged to have
had a long period of time between modem frequency adjustments.  Anyone
have figures on how often a PEP modem hits a line change which requires
frequency adjustment?
-- 
Scot E. Wilcoxon  sewilco@DataPg.MN.ORG    {amdahl|hpda}!bungia!datapg!sewilco
Data Progress 	 UNIX masts & rigging  +1 612-825-2607    uunet!datapg!sewilco