Lee Howard wrote:
> Olivier Krief wrote:
>
>> For example, it seems that Brother 8360P uses Super G3 mode.
>> Is there a fax-modem offering such capability so that I could easily
>> check if I still cannot hangup when I enable or disable Super G3 mode ?
>
>
>
> MultiTech 5634-series and MainPine RockForce fax modems (Agere
> chipset) support SuperG3. You'd run these with HylaFAX, for example,
> and not Asterisk.
It is worth pointing out that the V.34 modems have almost no chance of
achieving V.34 speeds if you go:
PSTN->analogue line->asterisk->FXS port->modem
if you go
PSTN->digital line->asterisk->FXS port->modem
performance will depend on the FXS port, and any internal timing issues.
With a TDM400 card its fairly unlikely to work. With a channel bank
connected to a port on the same digital card that connects to the PSTN
chances are high.
The problem with the PSTN->analogue line->asterisk->FXS port->modem path
is signal degradation through the extra analogue->digital->analogue step
is too much for V.34. For FAX modems up to V.29 it is no problem. For
V.17 is tends to work if the port quality is good.
Steve
Which fax-modem would you pick to highlight this behaviour ?
I mean :
"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 ?"
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.
Reading destination fax machine's reception report, you can rate each sending and tell
what your System Under Test is capable of.
Cheers
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