Re: [hylafax-users] T.30 T2 timeout, expected signal not received

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

Hi Arshavir,

This is a complex area and does not have a simple answer....

Agere (aka Lucent) have manufactured something like thirty different modem
chipsets over the years and none of them are 'perfect'.  The Venus chipset
is pretty robust after almost ten years of development although the firmware
supplied by Agere still requires something like seventy bug fixes to produce
the code that we use in our RockForce products.

The Agere OCM and OCF ('One Chip Fax') chips are intended for low cost
products which do not require external Flash or Ram to operate.  We tested
these chips extensively during 2003/2004 when we considered them for our
RockForce IQ product range.  Unfortunately, we had lots of issues with the
firmware (not surprising when you consider that the OCM/OCF chips use a
different controller chip from Venus) and eventually abandoned the chipset.
Interestingly, Agere no longer promote the OCM/OCF products for fax
applications on their website http://www.agere.com/entnet/modem_dsp.php

Choosing a modem can be difficult and you will get lots of differing
opinions from HylaFAX users.  In my opinion a lot depends on what you intend
to do with the HylaFAX server.... Few businesses can accept lost fax's
and/or poor performance, and this is one of the reasons that Mainpine
invests so much effort in testing and approving fax software for use with
our hardware.

Hope this helps !

Regards

ANDREW RINALDI
Mainpine Limited Support
USA +1 503 822 9944 | Asia/Europe +44 1225 869439  
andrew.rinaldi@xxxxxxxxxxxx | www.mainpine.com

-----Original Message-----
From: Arshavir Grigorian [mailto:grigorian@xxxxxxxxx] 
Sent: 14 August 2006 02:53
To: andrew.rinaldi@xxxxxxxxxxxx
Cc: Lee Howard; SCIN - Danilo Bottino; hylafax-users@xxxxxxxxxxx
Subject: Re: [hylafax-users] T.30 T2 timeout, expected signal not received

Pardon my ignorance, but from the following excerpt from the docs, it looks
like Agere chipsets should work. However, I guess the keywords are "new" and
OCM. Is there any way to know whether a specific model is "new" and not OCM?
The reason I am asking is that I recently posted a question on the mailing
list about a specific modem I thought about buying specifically for Hylafax
and I am not quite sure whether it will work or not.
And considering that no one has responded, I am assuming that it can't be
determined what chipset the modem has just by its model. Is this correct?

"... modems with a new Lucent/Agere chipset (a.k.a. "Venus" found on
MultiTech, Zoom, and MainPine modems) all work very well in Class 1 and 1.0
(if the modem reports support for it via the AT+FCLASS=?
command) ..."

I guess my other question is, is there any way to know whether a modem
supports Class 1 and 1.0 before installing it (vs running
AT+FCLASS=?). I buy my equipment from the net and you almost have to
buy blind because most of the ways to determine some parameter or another is
by having it installed and running commands against it.

Thanks in advance for any comments.


Arshavir



On 8/12/06, andrew rinaldi <andrew.rinaldi@xxxxxxxxxxxx> wrote:
> Hi Danilo,
>
> The Agere OCM firmware has numerous problems and is rarely upgradeable 
> because the chip does not require external Flash or Ram (OCM is an 
> acronym for 'One Chip Modem').
>
> I would suggest that you buy yourself a decent modem.
>
> Regards
>
> ANDREW RINALDI
> Mainpine Limited Support
> USA +1 503 822 9944 | Asia/Europe +44 1225 869439 
> andrew.rinaldi@xxxxxxxxxxxx | www.mainpine.com
>



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