Olivier Krief wrote:
2006/5/21, Steve Underwood <[EMAIL PROTECTED]
<mailto:[EMAIL PROTECTED]>>:
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
Hi 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.
I thought I had clearly said this was related to the nature of the path,
and has little to do with the specific modem you use.
Steve
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