This page describes features of certain modems that should
be kept in mind when using Venta4Net.
USR Sportster and 3COM Modems
Various Modems with Rockwell/Conexant
Chips
Multitech modems
Various modems with Lucent (V253) Chips
Modems detected as ST Soft Modems
SmartLink
1. USR Sportster and 3COM
Modems
By voice command set, these modems are defined by the program
as being one of the following types:
USR Sportster Vi - usually quite old modems that
do not support speakerphone mode.
USR Sportster Voice and USR Sportster Voice (2)
- modern modems of various types and names.
The difference between the two types, from the program's
perspective, is in the speakerphone mode activation method,
i.e. if the modem has been identified as USR Sportster Voice
and this mode does not work, try setting the USR Sportster
Voice (2) voice command set.
USR Voice: Mix of V.253 & IS-101 - new modem
versions (winmodems).
Despite their diversity, all these modems share the common
drawbacks described below:
1.1. The modem frequently terminates fax reception at 9600
baud rate and higher because of slight noise in the telephone
line. (See the section Only
part of a document can be received.)
1.2. These modems cannot start facsimile message transmission
as they cannot detect the remote fax initial whistle (pilot
tone). If you use one of these modems, then with manual
transmission you should start sending earlier so that the
modem does not miss this tone (whistle). For automatic transmission,
you should probably select the Disable voice mode when
sending out a fax setting under the Fax - General
tab, since when detecting fax answer in voice mode the modem
switches to fax mode and misses the remote fax response.
Switching to fax mode after fax answer detection takes a
certain amount of time. This time is time is made up of
the time spent processing the command for switching from
voice to fax mode (which cannot be reduced) and the time
interval set by the modem's S6 register. The latter can
be reduced by replacing the setting value in Command
for starting fax transmission in established connection
under the Modem - Properties - Fax tab with
ATS6=0X3D
For this setting to work, you need to set an appropriate
country code in the modem. Many country codes prohibit setting
an S6 register value lower than 2, which corresponds to
2 seconds of delay. The modem can return OK for a lower
value, but in fact this value will not be set. In any terminal
program, try typing the command
ATS6=0
and then
ATS6?
If the modem returns 0, there is no need to change the
country code; if it returns a value other than 0, the country
code needs to be changed. For example, replacing a country
code with 0 (USA/Canada) will set the S6 register to 0.
At the same time, problems with detection of a busy signal
with other programs may arise.
WE HAVE NOT TESTED THE SEQUENCE OF ACTIONS CITED BELOW
ON ALL USR/3COM MODEMS. IT MAY HAVE UNDESIRED EFFECTS ON
YOUR MODEM. WE CANNOT ASSUME RESPONSIBILITY FOR SUCH EFFECTS.
IF YOU ARE CONFIDENT YOU KNOW YOUR MODEM, TRY IT AT OUR
OWN RISK.
Quote from 3COM/USR FAQ:
17. First of all, see what your modem returns upon the
ATY14 command. If it is a single number, consider yourself
lucky: the country code can be changed directly using the
ATC10=XX command, where XX is a country code.
0 USA/CANADA
|
8 South Africa
|
17 International
|
1 Japan
|
9 Italy
|
18 Austria
|
2 Finland
|
10 New Zealand
|
19 Ireland
|
3 Sweden
|
11 Czech/Slovakia
|
20 Spain
|
4 UK
|
12 Belgium
|
21 Portugal
|
5 Norway
|
13 Denmark
|
22 Asia
|
6 Switzerland
|
15 France
|
23 Korea
|
7 Netherlands
|
16 Germany
|
|
After a country code has been changed, it is recommended
that you execute the following commands:
ATGBOOT5
ATGM
1.3. USR Sportster Voice and USR Sportster Voice
(2) voice command set types. The difference between
these two types with regards to the program is in the speakerphone
mode activation method. If the modem has been identified
as USR Sportster Voice and this mode does not work,
try the USR Sportster Voice (2) voice command set,
and vice versa.
2. Various Modems
with Rockwell/Conexant Chips
Based on voice command set, these modems are defined by
the program as being one of the following types:
- Rockwell
- Rockwell (Variant 2)
- Rockwell (Variant 3)
- Rockwell (IS101)
- Rockwell (V.253)
2.1. For many modems with these chips, modem voice data
formats with an 11025 Hz sampling rate are not recommended.
Many of them cease detecting DTMF, busy, fax and other signals
at this frequency.
2.2. Rockwell and Rockwell (Variant 2) voice
command set types. The difference between the two types
with regards to the program is in the speakerphone mode
activation method. If the modem has been identified as Rockwell
and this mode does not work, try the Rockwell (Variant
2) voice command set, and vice versa.
2.3. Rockwell and Rockwell (Variant 3) voice
command set types. The difference between these two types
with regards to the program is in the sound volume control
method. If the modem has been identified as Rockwell
and the volume of standard announcements in a telephone
line is low, try the Rockwell (Variant 3) voice command
set and use the volume control.
2.4. By default the program selects the PCM/8bits voice
data format for Rockwell (V.253) voice command set
modems because it is supported by the majority of modems
with this command set. However, in some modems with the
Rockwell (V.253) voice command set, this data format
is not well-supported. If your modem supports such formats
as A-Law and uLaw (you can find out by trying
them), you should use these instead. It is quite possible
that sound quality will improve greatly.
3. Multitech modems
For the majority of Multitech modems, the Bit order
setting under the Fax - General - Advanced tab must
be set to Multitech modem style. A characteristic
indication of incorrect setting is when fax reception starts
normally, but the received fax contains:
- Only a few vertical bands (if the Replace garbled
lines on the screen setting under the Fax - General
tab is set to Full);
- Multiple horizontal strips (if the Replace garbled
lines on the screen setting is set to None) and
the page contains no useful information.
You probably need to change this setting if the fax contains
either of these.
4. Various modems with
Lucent (V253) Chips
By voice command set, these modems are defined by the program
as being one of the following types:
- Lucent (IS-101)
- Lucent (V.253).
4.1. Modems at our disposal have the following bug: after
voice mode operation with an 11025 Hz sampling rate the
modem is unable to establish facsimile connection. In other
words, if you are going to use the modem in combined mode
(fax and voice), do not select voice data formats with this
sampling rate.
4.2. Winmodems detected as Lucent (V.253) do not support
speakerphone mode.
5. Modems detected
as ST Soft Modems
With these modems, voice mode must be switched off for
fax transmission, because after voice mode operation the
modem is unable to establish an outgoing facsimile connection.
6. SmartLink
The facsimile message transmission features of these modems
are the same as those of US Robotics modems (see item 1.2
of this section).
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