2006/5/21, Steve Underwood <<a href="mailto:steveu@coppice.org">steveu@coppice.org</a>>:<div><span class="gmail_quote"></span><blockquote class="gmail_quote" style="border-left: 1px solid rgb(204, 204, 204); margin: 0pt 0pt 0pt 0.8ex; padding-left: 1ex;">
Lee Howard wrote:<br><br>> Olivier Krief wrote:<br>><br>>> For example, it seems that Brother 8360P uses Super G3 mode.<br>>> Is there a fax-modem offering such capability so that I could easily<br>>> check if I still cannot hangup when I enable or disable Super G3 mode ?
<br>><br>><br>><br>> MultiTech 5634-series and MainPine RockForce fax modems (Agere<br>> chipset) support SuperG3. You'd run these with HylaFAX, for example,<br>> and not Asterisk.<br><br>It is worth pointing out that the
V.34 modems have almost no chance of<br>achieving V.34 speeds if you go:<br><br> PSTN->analogue line->asterisk->FXS port->modem<br><br>if you go<br><br> PSTN->digital line->asterisk->FXS port->modem
<br><br>performance will depend on the FXS port, and any internal timing issues.<br>With a TDM400 card its fairly unlikely to work. With a channel bank<br>connected to a port on the same digital card that connects to the PSTN
<br>chances are high.<br><br>The problem with the PSTN->analogue line->asterisk->FXS port->modem path<br>is signal degradation through the extra analogue->digital->analogue step<br>is too much for V.34. For FAX modems up to
V.29 it is no problem. For<br>V.17 is tends to work if the port quality is good.<br><br>Steve<br><br></blockquote></div>Hi Steve,<br><br>Which fax-modem would you pick to highlight this behaviour ?<br>I mean :<br><br>"If you had to buy a single fax-modem to complement a laptop to demonstrate a TDM or ToIP system is
V.34 or V.17-capable, which fax-modem would you choose ?"<br><br>You launch a shell-script from your laptop and it sends 5 or 6 faxes with the same content to a given destination (always the same one) at different speeds or protocols.
<br><br>Reading destination fax machine's reception report, you can rate each sending and tell<br> what your System Under Test is capable of.<br><br>Cheers<br>