2N Fixed line replacement with 2N SmartGate - Manual v1.1.2 - Manual (Page 69)

COM – Serial Interface 4.4
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CSD PC-PC Data Transmission
The CSD mode provides data transmission in the GSM network at the maximum
transmission rate of 14400 bps. It works like a classic connection of two modems
(AT commands ATD, ATH, ATA, etc.). Connection can be made with another GSM
modem or a PSTN modem.
Caution
 Data calls and fax calls from the PSTN come as voice calls (the telephone
line on 2N® SmartGate rings) because an analog network is unable to
distinguish a modem/fax call. Therefore, it is necessary to have a special
telephone number for incoming data and fax calls on the SIM card
different from voice call numbers (Multi-numbering scheme). The GSM
network identifies a call incoming to this number as a data/fax call and
lets the COM serial interface ring. For gateways with Fax option (analog
fax and data connection) see section 6 - Fax and Data function.
CSD or High-Speed GPRS Data Connection to Internet
To connect to the Internet, install the faxmodem driver from the 2N® SmartGate
CD-ROM first. Another possibility is to use the GSM provider‟s installation wizard in
case it supports the SIEMENS GSM module installed in 2N® SmartGate (SIEMENS,
MC55/56 or MC55i). GPRS/faxmodem driver can be found on installation CD. The
path to the driver is \\data\SmartGate\Modem driver\. Driver‟s filename is
mdm2n_vx.x.inf where x.x stands for the version of the driver.
The installation wizard usually configures the telephone connection of the
network too. If you use manual installation, you have set it properly. Ask you GSM
provider for Internet connection instructions because they can be different for each
provider (especially the telephone number to be dialed, DNS, etc.). For GPRS
connection is necessary to set the APN. It could be set in gateway using PCManager
(GSM&SIM - GPRS APN) or in modem extra settings in PC:
Example: at+cgdcont=1,"IP","internet.t-mobile.cz"
Caution
 GSM providers mostly specify the *99# number to be dialed for GPRS
connection in their instructions. SIEMENS GSM modules require the
*99***1# format.
CSD or GPRS Data Connection?
The maximum CSD transmission rate is 14400 bps. GSM connection is reserved for
the whole time of connection and calls are charged according to the connection
time. The CSD mode can provide data connection of two PCs.
2N® SmartGate is equipped with GSM modules providing GPRS class 10 (4+2
timeslots), which means that it is able to transmit data into a PC at the rate of
85600 bps and at half the rate towards the GSM network. The GPRS cannot be used
for connection of two PCs. It can only provide connection with an APN – e.g. the
Internet. Most GSM providers charge GPRS connections according to the volume of
data transmitted or by a lump sum and so the GPRS is suitable for long-time
connection with occasional data transmissions.