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Chapter 4 ComPort Emulator
The ISDN T/A 128 adapters support Microsoft Windows Comm. API interface. This
allows applications (especially popular analog modem's applications) to access ISDN
T/A 128 adapters as an emulation modem (this is an emulation does NOT really support
fax or modem features). Windows Comm. API also enables existing applications based
on the AT command set to access ISDN. This feature is called the Comport Emulator
and also allows also extra AT commands to enable ISDN features such as HDLC, X.75,
V.110, V.120, or Async to Sync PPP (see list below).
1.
Windows 3.1 system.
atloader.exe program, (double click the AT Console icon, see figure 3-2). AT
console will not be activated automatically at startup unless you add it to the StartUp
group in Windows 3.1. Normally you should activate yourself.
2.
In Windows 95 system.
F
Windows Comm. API can only provide AT-emulation if the application
requests its COM port services from Windows.
application if it tries to access the com port hardware directly or if your
software does not use the standard Windows comm. driver interface.
The following AT Commands are provided to allow control of the ISDN connections, line
protocols and call handling. You should change your application setup-strings using
these parameters to access ISDN T/A 128 adapter with the correct protocol and settings.
Command
Ata
ATBn
Windows Comm. API is enabled only after running the
Windows Comm. API is enabled automatically.
Samples
Answer an incoming call
Select protocol of transmission in B channel
ATB0
64K HDLC (default with universal modems under Win95)
ATB11
V.110 Async. User rate = 1200 bps
ATB12
V.110 Async. User rate = 2400 bps
ATB13
V.110 Async. User rate = 4800 bps
ATB14
V.110 Async. User rate = 9600 bps
ATB15
V.110 Async. User rate = 19200 bps
ATB16
V.110 Async. User rate = 38400 bps
ATB32
X.75 ISO 8208
ATB4
Async PPP to Sync PPP converter (default setting with
Win95 Async to Sync PPP modem)
ATB41
Async to Sync PPP conversion in ML PPP mode,
compatible with Microsoft ISDN Accelerator pack
ATB42
Async-to-Sync PPP conversion in MLPPP
Description
40
It cannot support the
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