Herriot, Nicholas, VF-Group wrote: > I thought the +++ escape sequence was rarely used. I've read that it's usually disabled > to avoid malfunction in case these characters are legitimately a part of the data stream? Indeed. Though accidental misinterpretation was very unlikely, because the modem treated the "+++" sequence special only if it was preceded by, and followed by, a period of "silence" on the line. I have no information how the modern devices behave in relation to DTR transitions (which are "virtual" anyway since there is no real serial line there), and "+++" sequence. > If this is a workaround where do people suggest the intelligence be placed? > > > -----Original Message----- > From: Eugene Crosser [mailto:crosser average org] > Sent: 14 October 2009 07:05 > To: Dan Williams > Cc: Pablo Martí Gamboa; Herriot, Nicholas, VF-Group; networkmanager-list gnome org > Subject: Re: Problem with Simple.Connect > > Dan Williams wrote: > >> But with DTR and without ATH, isn't the connection still active? It >> thought DTR transitions just broke into command mode so you *could* >> run ATH. I didn't think they terminated an active data connection too... > > In the olden days of dialup modems, dropping DTR was the "official" way to terminate the connection. The sequence of "<pause>+++<pause>ATH\r" was considered a workaround, for the case when you had a three wire cable and the modem was configured to ignore (the absence of) DTR. > > Eugene
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