On 08-23-96 Ian Smith wrote to Michael Raiteri... 
 
 IS> BG>Sounds to me like the original connect was made without error 
 IS> correction, 
 IS> BG>something which disabling the V.42 detect phase is supposed 
 IS> BG>to prevent. 
 IS> 
 IS> Not directly - bypassing the detect phase to a modem known to support 
 IS> LAPM can solve some problems, with some modems, but disabling 
 IS> V.42 detect phase (thus going straight into LAPM protocol 
 IS> negotiation) by itself needn't be directly related to 
 IS> whether you're demanding an EC connection or not; well on 
 IS> my modem it's optional. anyway. 
 
What type of modem is that. 
 
 IS>  MR> with and without compression.  Dynalink support haven't a 
 IS> 
 IS> We already know that BTLZ compression is broken on these, don't we? 
 
True 
 
 IS> As Arthur's mentioned, this might be a problem more related 
 IS> to training too 'aggressively'; the symptoms are similar to 
 IS> those experienced with Arthur's Motorola or my Dataplex 
 IS> DPX596 when told (or configured by default) to demand, in 
 IS> effect, too high a signal quality reading for any given 
 IS> negotiated speed. 
 IS> 
 IS> This effect has been seen consistently calling various modems, lately 
 IS> around 
 IS> here a rack of Netcomm V.34 modems which are likely set too 
 IS> insensitive, maybe again from poor defaults to best cope 
 IS> with locally non-optimal lines.  I found this earlier to be 
 IS> a problem with some older Maestros, on problematic lines. 
 IS> 
 IS> It may be a matter of finding out what can you set in the Dynalink / 
 IS> Sportster to have it train less aggressively, that is, to 
 IS> fallback or negotiate a lower speed connect, with a given 
 IS> determined line quality?  It seems to be the extra 
 IS> negotiation time that makes others (esp. the Netcomms) 
 IS> assume / demand a non-EC connect.  You need particularly 
 IS> good lines to support non-EC connects at any rate much 
 IS> above 14400 (hence the cleardown disconnects later). 
 IS> 
Any idea what sort of settings are used to make a modem train less 
aggressively. 
 
Cheers 
Mike 
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