Specifications

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Circuit Switched Data
A CSD connection makes it possible to transfer serial data at speeds from
300 bit/s up to 14.4 kbit/s depending on network providers.
The table on the right side shows the available speeds and protocols.
Data communication can be set up for transparent or non-transparent data
transfer. RLP (
Radio Link Protocol) is used in non-transparent transfer; this is an
error corrected GSM protocol. This protocol creates a more reliable transfer,
but also generates delays in the transfer. In order to use this function requires
the support of both the service and the connected devices.
CSD Connection (Circuit Switched Data)
To be able to make a connection to GSM modem is a SIM-card required from
a GSM Network Provider to obtain a telephone / data number. It’s the possible
from a remote site to connect the GSM-modem or vice versa.
As the connection is made through a circuit switched network are you con-
stantly connected until the line is disconnected.
Network security
The most imported security
mechanisms on the GSM
Network is:
• Strong authentication of user
(SIM / Pin Code).
• Encryption of data over the radio link.
This ensures a secured data transfer and
unauthorised use.
SMS (Short Message Service)
The GSM modems offer the possibility to send a text message
of up to 160 characters to any equipment that can handle SMS.
The GSM modems has the feature to be able to send pre-programmed
SMS to one specic phone number if the DTR input are triggered.
It could be used as an alarm indicator from e.g. a PLC to a service
technician’s cellular phone indicating that some faults occured in the system.
Speed Protocol
2400 bit/s V.22 bis
4800 bit/s V.32
9600 bit/s V.32
14400 bit/s V.32 bis
2400 bit/s V.110
4800 bit/s V.110
9600 bit/s V.110
14400 bit/s V.110
MSC
BSC BST
GSM
PSTN
Telephone
004614112233
ATD
004614112233
AUDIN - 8, avenue de la malle - 51370 Saint Brice Courcelles
Tel : [phone] - Fax : [phone] - Web : http: www.audin.fr - Email : [e-mail]