Developers guide

Chapter 22: Wireless Wide-Area Networking
Dial-up Data Connections
196 Psion Teklogix Mobile Devices SDK Developers Guide
22.3.3 Dial-up Data Connections
The following dial-up connections are available through the WWAN driver:
• GSM Networks
• UMTS Networks
• CDMA Networks
• iDEN Networks
22.3.3.1 Dial-up Data in GSM Networks
Not all GSM networks support dial-up data connections to land-line modems (e.g. Rogers in
Canada has never supported dial-up data connection, Microcell Fido in Canada discontinued dial-
up data connection support a few years ago). For those networks that support dial-up data connec-
tions no additional configuration should be required for a connection to an analog modem
at 9.6 kbps.
Some networks allow faster dial-up connections at 14.4kbps. The AT command "+CBST=14,0,1"
has to be added in the WWAN UI settings of the Wireless Manager Control Panel, under Proper-
ties > Configure… > Call Options > Extra Settings to enable this mode. The Asus AGC-100
modem does not support 14.4kbps.
The even faster High Speed Circuit Switched Data (HSCSD) mode available on a few networks is
not supported by any of the modems in Psion Teklogix products.
For ISDN lines, the situation is more complex. Some ISDN modems may accept analog connec-
tions as above, while others require the protocols V.110 or V.120 to be used. These also require an
additional AT command.
If an ISDN modem requires the protocols X.75 or HDLC, then no connection is possible. Also,
many GSM networks do not support V.120 (e.g. Vodafone D2 in Germany) and only the Audio-
vox RTM-8000 and CMCS NTN-000 support V.120.
For more details on ISDN connections see D. Živadinovic, M. Winkler, Des Surfers Bastelstunde
in c't 7/2001, page 228 (in German).
For more details on GSM AT commands see Digital cellular telecommunications system (Phase
2+); Universal Mobile Telecommunications System (UMTS); AT command set for 3G User
Equipment (UE), 3GPP TS 27.007 version 5.4.0 Release 5, ETSI, 09/2003.
The following table summarizes the required AT commands.
Land-line modem Speed Extra Settings
analog 9.6kbps
analog 14.4kbps +CBST=14,0,1
ISDN V.110 9.6kbps +CBST=71,0,1
ISDN V.110 14.4kbps +CBST=75,0,1
ISDN V.120 9.6kbps +CBST=39,0,1
ISDN V.120 14.4kbps +CBST=43,0,1