Re: Best fax modem settings to receive from multifunction devices?
- From: "SuperGumby [SBS MVP]" <not@xxxxxxxxxxx>
- Date: Thu, 28 Dec 2006 19:43:55 +1100
in _general_ a dedicated fax board will do better than a generic device
(modem).
When I was working for a modem manufacturer I once sent a client a 'trial'
modem to replace his $1k fax device, it worked. It wasn't that the device
was better, it just worked better in his situation.
I'm going off on a tangent, my current (I almost said next, but it's sortta
underway) project is Trixbox for not only FAX but telephony. I mention it
because I think those FXO cards or possibly 'winmodem-like' things may
handle FAX better 56K modems. I think all modem manufacturers got lost doing
FASTER AND FASTER DATA while neglecting the FAX side of things.
I admit to a skewed view. IMHO inbuilt and giveaway FAX facilities are worth
_exactly_ how much you pay for them. Using dedicated devices with generic
software improves things, as does using generic devices and dedicated
software. Using dedicated software and dedicated hardware doesn't guarantee
anything (nor does slipping a piece of paper into a fax machine, but it does
seem generally more reliable than anything involving a computer) but it
improves your chances.
Is FAX over the three yr life of the 'project' worth 'a couple o' hundred
bucks', SBS FAX and a modem can do that.
Is FAX over the same time period more important than that? You may have good
justification for changing to a FAX device under software control (SBS).
Do you want high reliability? Dedicated software, dedicated hardware,
probably not running on SBS (Workstation may be a better idea).
Do you have critical FAX needs? Dedicated machine.
"Gregg Hill" <bogus@xxxxxxxxxxx> wrote in message
news:eLtGYPlKHHA.4460@xxxxxxxxxxxxxxxxxxxxxxx
I turned off compression due to Crina's and Brandy's previous suggestions.
I did not seem to make a difference.
I know that no fax will get 100% of inbound stuff, but this one gets EVERY
junk fax and not every valid fax. Figures.
The client is not happy with the results, since their HP 7110 (??)
received those faxes.
I wonder if a Brooktrout TruFax card would do better?
Gregg Hill
"SuperGumby [SBS MVP]" <not@xxxxxxxxxxx> wrote in message
news:OZLAvxkKHHA.3952@xxxxxxxxxxxxxxxxxxxxxxx
I haven't used the specific modems you refer to but,
99% of FAX software will talk to the modem at 19200. Main reason being
that FAX standards above 14k4 never really took off (people started doing
data transfers instead) and you need 19k2 DTE-DCE to support a 14k4
carrier.
The compression settings you are looking at are _MOST PROBABLY_ only
relevent to DATA through the modem. This is no big deal because FAX is
basically a bitmap image and the types of 'on the fly' compression modems
are capable of have very little if any application when FAXing.
The EC settings are purely DATA. I can't remember whether FAX (for legal
purposes) has it's own EC process or totally ignores EC, I _think_ it
totally ignores EC, purely due to legal reasons, an uncorrected stream
arrives at the receiver, noise was considered acceptable, deliberate
modification(correction) of the recvd data was not legally acceptable.
Keep in mind that FAX was legally accepted worldwide (AFAIK), this is one
of the intended 'precepts' of it's use.
By increasing the 'cancel if not connected within...' you can allow a FAX
device to negotiate a connection over bad lines to another device,,, or
you can rack up a REALLY BIG long distance bill as tx's to incorrect
numbers hold the line open for longer. Theoretically, the best strategy
is to sit there with the device's speaker on all day, for a few days, as
you time the negotiation period for each connection, time from 'off hook'
to 'connected' (software can do this) and set your cancel time
appropriately, allowing for the reasonable percentage of negotiations
which take longer to fail, STUFF THEM, they have a bad FAX device and
NO-ONE EVER PROMISED FAX WOULD WORK 100% either.
Sorry, had to expand on that. It's actually more of a 'our fax device
doesn't like your fax device'. Check out your favourite 'professional,
heavy duty, dedicated, all singing...etc...' FAX device, their support
section will _not guarantee_ connection to any other device, even another
of their own.
Drivers play a part, but generally if the driver works for DATA it's OK
for FAX.
Hardware flow control is important for computer based FAX.
"Gregg Hill" <bogus@xxxxxxxxxxx> wrote in message
news:OUM67TkKHHA.1240@xxxxxxxxxxxxxxxxxxxxxxx
Hello!
I was going to start a new thread because this one is old, but the
subject remains the same, so here I am. I tried four different modems
today at my problem client on their Dell PE 830 running SBS 2003
Standard R2. I tried the built-in serial port as well as a Siig
CyberSerial PCI 16C550 dual-port serial card. I tried their current US
Robotics Courier V.Everything model 3CP3453, an older 3Com Courier
V.Everything model 002806-00, an Encore ENF656-EV-CIPR, and a US
Robotics Courier V.Everything model 3453B, all with the latest firmware.
I tried a ton of different settings for COM and modem speeds,
compression ON and OFF, all with very little success until I settled on
38400 for both serial port and modem speeds, and compression off. That
seemed to work the best so far, but I have yet to request a fax from
their accountant whose Brother MFC-8300 is one of the ones that ALWAYS
fails to go through. I will do that in the morning. I previously tried
the US Robotics Courier V.Everything model 3CP3453 with all speeds
between 115200 and 9600, and it would not receive from that damn Brother
MFC, nor from several of their other clients.
I have two clients with Dell servers (PE 2800 and PE 830) and US
Robotics Courier V.Everything external modems (the problem child noted
above, and another one with a 3CP3453). I have tried various drivers,
COM and modem speeds, etc. One client works OK with their 3CP3453, i.e.,
they receive from all their customers, but I still see a few dropped
faxes each day in the logs. They don't notice it, and I am not saying
anything until I figure it at my problem child client. The other one,
noted above, cannot receive faxes from some Brother MFC devices. All the
recommendations I have seen say to use a 3Com (USR) Courier V.Everything
to answer these fax calls, but they still fail.
So my question now is, what are the most reliable settings to use to get
the SBS 2003 Standard R2 fax service to receive the most faxes using a
US Robotics Courier V.Everything modem (model 3CP3453 and/or 3453B, with
the latest firmware)?
COM port speed = ?
Modem speed = ?
Compression = ON or OFF ?
Error correction = Standard EC or Disabled ?
Cancel the call if not connected within = ?
Driver version = Courier V.Everything EXT PnP (V90-x2) or Courier
V.Everything EXT PnP (USA V90-x2 & caller ID) ?
The Courier V.Everything EXT PnP (USA V90-x2 & caller ID) choice is only
presented when I use the older 002806-00 model. The 3453B complains if I
manually choose that version after selecting "show all compatible
hardware." It's the usual "this driver may not be compatible" driver
warning.
I am about ready to heave this POS out the window!
Thank you for your help!
Gregg Hill
"Leythos" <Void@xxxxxxxxxxx> wrote in message
news:MPG.1ff513ca5db4773c98968e@xxxxxxxxxxx
In article <OPejaPXJHHA.4960@xxxxxxxxxxxxxxxxxxxx>, bogus@xxxxxxxxxxx
says...
What COM port and modem speeds do you use?
Port set to 115.2
Com 1 - the only serial port on the server.
Faxes seem to come in at 14.4k most times.
--
spam999free@xxxxxxxxxx
remove 999 in order to email me
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