Dear all,

because my old Creatix 33k6 modem is broken now I had to replace it.
Now I have several here, but no one seems to be able to send faxes to
fax services or fax/phone combinations.

The reason behind is that these pseudo fax machines need to be
informed that the sending modem playes the role of a sending fax
machine, rather than being a normal phone.

The modems I have here, Creatix 56k, Longshine 56k, Sky 33k6 and
others, all they do _NOT_ send this 1100 Hertz tone and so, when
trying to establish a fax transmission, it sounds like someone is
making a normal voice call and then say nothing.
So the call will be dropped by the called station after several
seconds.

The former, and now defective, modem does (did) send this tone and
everything went fine.
Modem settings:
http://www.dipl-ing-kessler.de/temp/crea33k6.gif
http://www.dipl-ing-kessler.de/temp/crea33k6.log

Initialisation in all cases:
http://www.dipl-ing-kessler.de/temp/winfax.gif

The test program which comes along with winfax says in all cases that
" the modem can be used with winfax".


But, for instance these modems do not send this tone:


Modem settings:

http://www.dipl-ing-kessler.de/temp/sky33k6.gif
http://www.dipl-ing-kessler.de/temp/sky33k6.log

http://www.dipl-ing-kessler.de/temp/creav90.gif
http://www.dipl-ing-kessler.de/temp/creav90.log


Maybe it is trivial but I cannot find any information in the manuals.

The one which works (worked) is the only one which is based on a
Rockwell chip. Can this be the cause?

Many thanks,
best regards,

Markus
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On Fri, 23 Feb 2007 14:20:21 GMT, dimke.fax@uni.de (Markus R. Keßler)
wrote:

Hi, just forgot to define what I mean by "1100 Hz tone". This is what
"real" fax machines send to the called fax station automatically after
dialling.

It is defined by ITU and here is how it usually sounds:
http://www.dipl-ing-kessler.de/temp/fax_tone.wav
This is just one sample, but in reality it will be repeated ad
infinitum, or until the fax connection is established (or at least one
of the fax machines terminates the connection.)

Is it possible that newer "fax modems" do not send this tone
by themselves but rather the fax software has to emulate it?

Best regards,

Markus
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Hi, hope to explain it clearly how it works:

When calling a distant fax machine the local fax machine dials and as
soon as the called fax answers, the calling device sends a 1100Hz tone
(http://www.dipl-ing-kessler.de/temp/1100hz.mp3) to tell the receiving
device that it is a fax device and expects to talk to a fax machine
aswell.

Then the receiving machine sends a 2100Hz tone
(http://www.dipl-ing-kessler.de/temp/2100hz.mp3) to confirm being a
fax machine too.

After this procedure the machines synchronise via handshake to find
out what highest transmission rate they can use. This is in most cases
9600 or newer devices can handle 14400 Bit/sec also.

==> Now the point is:

It _is_ possible to resign on this beginning 1100Hz tone and just wait
for the 2100Hz tone of the receiving station _as long as_ the
receiving station is a dedicated fax machine and nothing else.

It does _NOT_ work if the receiving station is any combination
consisting of an answering machine and a fax machine, where the
decision which one of them has to take the call is done by a fax
switch.

In this case sending this 1100Hz tone will "open" the fax switch and
the call will be answered by the fax machine.

Messaging services like "Arcor PIA" work in the same way. They also
need to be informed about what kind of message you want to leave, and
this is done sending this 1100Hz tone.
The service says that you could wait for a signal and then leave your
voice message, or you could start a fax trasnmission right now.

This is how it works in breve.

My question is / are:

How can this function be activated in V.34 / V.9x modems, i.e., which
settings have to be done to tell the modem to send this 1100Hz tone
right after dialling, or,
alternatively, which modems support this feature at all?

Best regards,

Markus
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Hello Markus,

please try the following:
Open Hyperterminal and connect to the modem via its COM port.
Now enter these commands:

1a) ath -> reset of modem
1b) atd******* -> modem should dial without sending a CNG tone
afterwards

2a) ath -> reset of modem
2b) at+fclass=1 -> modem is switched to fax mode
2c) atd******* -> modem should dial and then send the fax CNG tone
(1100 Hz).
It is important to switch the modem to the fax mode (by at+fclass=1)
before it dials because otherwise it wouldn't know that it has to send
the fax CNG tone.

This fax CNG tone is not mandatory.
Some combined phone/fax machines can answer an incoming fax call by
automatically switching to the fax mode after a while and sending the
CED tone (2100 Hz).
You will find more details in ITU-T Rec. T.30.

You could also try another fax SW. I am using Ventafax
(www.ventafax.com). This is an extremely powerful program and it can
generate a very detailed logfile which should give an answer to your
problem.

Please keep me informed about your progress.

Andreas

Hi Andreas,

thanks for your hint concerning the ITU spec! I just read the relevant
part and also checked the "at+fclass=1" command. It works with some
but not with all modem types. Even a 28.8 ISA card modem works, but
others, like Longshine V.90/V.92 refuse to.

In the meantime I just got some specs about intel modem chips. Perhaps
there's some news in them.

Best regards,

Markus




"Andreas Gosslau" <andreas.gosslau@nexgo.de> wrote:

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What is the exact model number of your Longshine modem?
Please ask the manufacturer, e.g. Longshine (www.longshine.de) , and
inform this newsgrouop afterwards.

Andreas

On Fri, 02 Mar 2007 17:04:43 +0100, Markus R. Keßler
<dimke.fax@uni.de> put finger to keyboard and composed:

Have you confirmed that it supports class 1 commands?

My Rockwelloid responds to ...

AT+FCLASS=?

.... with ...

0,1,2,1.0

- Franc Zabkar
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Andreas Gosslau schrieb:

Hi, this is what I found out in the meantime:

################################################## ####################
#
# Sky 336 (most likely made by Creatix, but not based on Rockwell
chipset):
#
################################################## ####################

Settings / parameters:

at+fclass=?
0,1,2,8

ati0
33600

ati3
CERNDEXX 1.0683 25/11/96

ati6
AT&T V.34+ Datapump Version 4.39


Results:

- WinFax Pro dials in Fax Class 2 mode, sends CNG, but ways to quiet ==>
Can send faxes to dedicated fax machines
but not to fax/answering services where call runs out

- Internet access via Trumpet Winsock reliable, (ragarding transmission
via modem relatively) fast and stable




################################################## ####################
#
# Creatix V.90
#
################################################## ####################

Settings / parameters:

at+fclass=?
0,1,8

ati 0
56000

ati 1
ROM TEST OK

ati 2
CD08.55 - 643 SERIAL (V.90-ONLY) SPEAKERPHONE 01

ati 3
CL-MD56xx

ati 4
CCCVGEXX V2.00 30/04/98

ati 5
Present, 32K DSP RAM.000
Host I/F: Serial
P. Mem. : 008 Bit 001 W.S.
D. Mem : 008 Bit 001 W.S.
DSP code location = INT ROM

ati 6
Germany 49

ati 9
CTX3260\12345678\MODEM\CTX3260\Creatix V90 3F

at &v
ACTIVE PROFILE:
Flow-Control: RTS/CTS (&K3)
B0 E1 L2 M3 N1 T Q0 V1 W0 X3 Y0 &C1 &D2 &G0 &J0 &P0 &Q0 &S0 &U0 &Y0
%A013 %C1 %E1 %G1 \A3 \C0 \G0 \J0 \K5 \N3 \Q3 \T000 \X0 -C0 -J1 "H3
"O032
S00:000 S01:000 S02:043 S03:013 S04:010 S05:008 S06:003 S07:060 S08:002
S09:006 S10:014 S11:090 S12:050 S18:000 S25:005 S30:000 S33:000 S37:000

STORED PROFILE 0:
B0 E1 L2 M1 N1 T Q0 V1 W0 X4 Y0 &C1 &D2 &G0 &J0 &P0 &Q0 &S0 &U0
%A013 %C1 %E1 %G1 \A3 \C0 \G0 \J0 \K5 \N3 \Q3 \T000 \X0 -C0 -J1 "H3
"O032
S00:000 S02:043 S06:003 S07:060 S08:002 S09:006 S10:020
S11:090 S12:050 S18:000 S25:005 S30:000 S33:000 S37:000

Internet:

PPP ENABLED
Executing script c:\trumpet\login.cmd.
PPP DISABLED
ATZ
OK
AT &F &C1 &D2 X3 m3 L2
OK
at dt 01920783
NO CARRIER


Results:

- Fax: Had to switch WinFax Pro manually to Fax Class 1. But, modem
dials, receiver answers, modem sends
CNG, but no transmission established. Call dropped after some seconds
(why?)

- Internet access not possible as shown above ==> maybe no common
compression algorithm?




################################################## ####################
#
# Devolo/Elsa V.92
#
################################################## ####################

Settings / parameters:

at+fclass=?
0,1,1.0,8,8.0

ati0
645

ati1
042

ati3
Version 1.21 / 31.05.2002

ati4
E1 L2 M1 Q0 V1 X4
%E3
&C1 &D2 &G0 &Y0
\T0
*Q0

ati6
MicroLink 56k Fun II

ati9
(
#DVL1262\89023456\MODEM\\MicroLink 56k Fun II00)

ati11
*** MODEM STATUS ***

Type: MicroLink 56k Fun II, Release: C1, (0000033409-0)
Firmware: Version 1.21 / 31.05.2002
TFunIIc-1-15 $Revision: 1.6.2.11 $ $Date: 2002/05/31 09:17:18 $
Build 1 V.250 V.253 V.92 T.31 TIA578

Controller: Ok, Type: SH1
Signal Processor: Ok, Type: P8773 1IA (47.00)
Rom: Ok, Type: SST39SF020A, WP: Ok
CRam: Ok
DRam: Ok
ERam: Ok, CRC: Ok
Line: International, Country: DE

at &v

active profile:

E1 L2 M1 Q0 V1 X4
%E3
&C1 &D2 &G0 &Y0
\T0
*Q0
S000:000 S001:000 S002:043 S003:013 S004:010
S005:008 S006:003 S007:110 S008:002 S011:090
S012:050 S014:138 S023:016 S028:000 S029:090
S035:000 S036:000 S037:001 S046:011 S069:070

stored profile 0:

E1 L2 M1 Q0 V1 X4
%E3
&C1 &D2 &G0
\T0
*Q0
S000:000 S002:043 S003:013 S004:010 S005:008
S006:003 S007:110 S008:002 S011:090 S012:050
S014:138 S023:016 S028:000 S029:090 S035:000
S037:001 S046:013 S069:070

stored profile 1:

E1 L2 M1 Q0 V1 X4
%E3
&C1 &D2 &G0
\T0
*Q0
S000:000 S002:043 S003:013 S004:010 S005:008
S006:003 S007:110 S008:002 S011:090 S012:050
S014:138 S023:016 S028:000 S029:090 S035:000
S037:001 S046:013 S069:070


Results:

- Internet access via Trumpet Winsock reliable, (ragarding transmission
via modem relatively) fast and stable

- Fax: Can do a "at+fclass=1"; "at dt 0". This makes the modem to dial
and send the CNG tone, but when accessed by WinFax Pro
the call will be dropped due to handshake problems (why?)




################################################## ####################
#
# Longshine 56k Fax Modem V.90 / V.92 ready)
#
################################################## ####################

Settings / parameters:

at+fclass=?
0,1,8

ati 0
57600

ati 1
CD08.55 - 747 SERIAL - DSP PATCH: 3.26

ati 2
ROM TEST OK

ati 3
MD56xx

ati 4
Intel Corporation

ati 5
Full V.92 Upgradeable
Present, 32K DSP RAM.000
Host I/F: Serial
P. Mem. : 008 Bit 001 W.S.
D. Mem : 008 Bit 001 W.S.
DSP loc : INT ROM

ati 6
USA 1

ati 7
Intel Corporation

ati 8
21F10

ati 9
AMB3100\12345678\MODEM\AMB3100\Intel V92 External Modem76


Results:

- Fax: Had to switch WinFax Pro manually to Fax Class 1. After that,
modem sends and receives faxes satisfyingly.
CNG clear and loud enough.

- Internet access via Trumpet Winsock is possible but sometimes the
transmission "hangs".
I assume that there might be a hardware handshake problem between modem
and serial interface.
Had no time yet to test with Xon/Xoff.

==> Is this a known problem?


Well, this is the news from my side.

Best regards,

Markus

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Hi Franc,

Franc Zabkar schrieb:

Yes, I know about this response. And it's also clear to me, that Rockwell
is still the King of modem chips ;-)

In my second posting there are several response messages listed.

Thanks and
best regards,

Markus

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"Markus R. Keßler" <dimke.fax@uni.de> schrieb im Newsbeitrag
news:45F1417E.5BA07FAC@uni.de...

If you like, please install Ventafax and send the logfile
protocom*.txt to me.
In many cases it is possible to find out from this logfile why a fax
call fails.

Andreas