40
Text of notification on changing the IP address contains new IP address in the following format:
"IP=xxx.xxx.xxx.xxx".
Message
example
on
change
of
IP
address:
006/15:15:58/ATM IP=123.456.789.012".
Text of SMS on internet connection loss: "GPRS-ERR". The SMS message on losing the internet connection
is not sent if connection is restored within the specified time interval set in the
SMS resending time out
pa-
rameter, as well as when the modem switches to the service, offline or CSD mode. The sample of SMS on in-
ternet connection loss:
007/15:15:59/ATM GPRS-ERR
.
4.14. Data Transmission via CSD
The ATM modem supports data transmission via CSD (over voice channel).
The following conditions are required for data transmission via CSD:
mobile network operator supports the technology of data transmission via CSD;
authorized phone numbers are specified in the modem settings.
Calls can be authorized from any number or only from a specified group of numbers. Enabling
Any phone
no.
option or specifying the group of phone no. can be done in the tab
Settings
Advanced
CSD
of the
ATM Control utility.
CSD is supported both in the
Client
and the
Server
modes of the modem operation. In addition, modem
supports a separate mode for data transmission only over CSD.
At an incoming call the modem determines its type: voice call or data transmission. If it is a voice call, the
modem refers it to the offline mode. If it is determined as data transmission, the modem compares the tele-
phone number, from which the call has been received, with the phone numbers enabled in the settings. If the
number coincides with the enabled ones (or all numbers are enabled), the modem switches to the CSD mode.
In this case, transparent data communication between an external device and a connection initiator
1
is estab-
lished. Connection is supported until the initiator ends the call. The automatic exit from the CSD mode will be
initiated only when the SIM card is removed for the modem.
You can enable up to four phone numbers or enable the CSD mode initiation from any number.
CSD mode is considered dominant: if the call is received during data transmission over network, the internet
connection is broken and the CSD mode is set. After data transmission via CDS is complete, the modem re-
turns to the action performed before switching to the CSD mode. If it was connected to server, it tries to re-
establish connection. If it server modem was online, then the modem goes back online and awaits incoming
connections. If the modem was in network mode, then it will re-establish internet connection, and if it was in
offline mode, then it will go back to offline mode.
1
For example, by the dispatching centre.