Path: utzoo!utgpu!news-server.csri.toronto.edu!rpi!zaphod.mps.ohio-state.edu!swrinde!cs.utexas.edu!sun-barr!ccut!wnoc-tyo-news!astemgw!kuis!aegis!davidg From: davidg%aegis.or.jp@kyoto-u.ac.jp (Dave McLane) Newsgroups: comp.dcom.modems Subject: Re: Will T2500 cycle all speeds if S50=3? Message-ID: Date: 19 Mar 91 22:24:36 GMT References: <1991Mar18.143749.1250@crom2.uucp> Organization: Aegis Society Lines: 38 jim@crom2.uucp (James P. H. Fuller) writes: > Because several of my local callers have old and/or dimwitted modems > that get confused and can't connect if I set my T2500's S50 register to 0 > (automatic speed determination, with either PEP or V.32 tones first, > depending on S92) I presently have S50=3. That sends 2400bps tones first > and the local folx are happy, but as I read the manual (it's not totally > clear on this point -- or maybe it is but I just don't like what I'm read- > ing...) the modem is ONLY going to cycle among 2400-1200-300bps and NEVER > send PEP or V.32 tones. Is this correct? Sort of.... but not quite. According to the manual + my experience, there are four registers controller this function: S50 controls the maximum/only speed depending on S94; S92 controls whether the PEP tones are presented first or last (assuming they are included in those allowed by S50; S90 is used to determine whether to use Bell 103/V21 mode. This is not new information, it's in the manual; I'm only saying that I have found it to be the case. Note that S92 controls *only* the presentation of the PEP answer tones; if you run S50=0 and S92=0 the answer tones are PEP, 9600, 2400, 1200, 300; if you run S50=0 and S92=1 the answer tones are 9600, 2400, 1200, 300 PEP. In other words the 9600 tones stay in the same place. You *can* put a 9600 tone in front with S92=2 but I suspect that the (unspecified) confusion (like what do they do when the are confused?) may be coming from the 9600 answer tones. When I changed the modem on Aegis to the T2500 some people had to change the value in their modems/scripts that waited for a CONNECT or the prompt as due to the increased time due to having to wait through the 9600 answers tones. The confusion you mention couln't be this, could it? --Dave