Re: [hylafax-users] some serious modem testing

["andrew rinaldi" <andrew.rinaldi@xxxxxxxxxxxx>]

Hi Bojan.

I would like to add that if you use a fax card from a manufacturer who cares
about fax then you will benefit from all the years of testing that they have
undertaken.

Mainpine has an extensive ISV test programme which includes sending hundreds
of thousands of fax's.  Here's an overview of the process;

http://www.mainpine.com/corporate/press/2006/isvlab.php

Having tested most of the fax hardware and software in the industry I know
how important both parts are in a successful and reliable fax solution.

Regards

ANDREW RINALDI
Mainpine Ltd. Support
USA +1 718 701 2422 | Asia/Europe +44 1225 436137 
andrew.rinaldi@xxxxxxxxxxxx | www.mainpine.com

-----Original Message-----
From: hylafax-users-bounce@xxxxxxxxxxx
[mailto:hylafax-users-bounce@xxxxxxxxxxx] On Behalf Of Lee Howard
Sent: 25 May 2006 18:33
To: Bojan Stojanovic
Cc: hylafax-users
Subject: Re: [hylafax-users] some serious modem testing

Bojan Stojanovic wrote:

>I got some modems, and they work in Class 1 (I managed to send and 
>receive some faxes). But how can I be 99% sure that they will work 
>reliable when I put server in regular every day use?
>

When a manufacturer sends me a new modem to test I deliberately do lots of,
perhaps uncommon, fax things with it in order to provoke errors.  
There's a lot more of this to test with a Class 2/2.0/2.1 implementation
than there is to test with Class 1/1.0.

In Class 2x I send and receive faxes of varying formats and at different
modulations and speeds (I test it against a Class 1 modem on the other end,
since I can control things much better in Class 1)... and I examine the logs
and resulting fax images and compare them against T.32 and T.30 specs.  This
requires a lot of faxing back and forth to do.

In Class 1x you can test virtually everything that the Class 1x
implementation does in a single call.  To test the DSP you'd want to test
one fax reception and one fax sending for every modulation supported.  Then
I examine those logs and resulting fax images and compare them against T.31
and T.30 specs.

But as most people aren't going to know T.30/T.31 well enough to see the
issues just by looking at the logs, probably the best thing that you could
do to test modems in Class 1/1.0 is to have two modems hooked up and send
numerous faxes between them and expect no errors to occur at all.  If you do
get errors then resolve those issues before being 99% sure that they will
work reliably in production use.

Thanks,

Lee.


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