Installing and putting a SINAUT modem into operation
5.3 GSM/GPRS modem MD720-3
Station control system
System Manual, 07/2009, C79000-G8976-C178-07
187
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Figure 5-2 Connecting the MD720-3 to a TIM over RS-232 and to an antenna
5.3.3 Prerequisites for operation
Requirements depending on the transmission method
● Transmission using CSD (Circuit Switched Data)
The following requirements must be met to use the SINAUT MD720-3 in terminal mode:
– SIM card of a GSM network provider with activated CSD data service 9 600 bps and
call number for data calls
– Availability of a GSM network
● Transmission via GPRS using the MSC protocol
The following is required to use the SINAUT MD720-3 for data transmission by GPRS:
– A subscriber contract with GSM network operator that supports GPRS
– SIM card for enabling GPRS for the user by the network operator
IP address of the partner
To allow the MD720-3 to establish a VPN connection actively, the partner must have a
fixed IP address. Many Internet Service Providers (ISPs), however, assign the IP
addresses dynamically; in other words, the IP addresses of the computers or networks
with access to the Internet change. A fixed IP address can be obtained in the following
ways:
– Fixed IP address with dedicated line to the GPRS provider
The partner is connected directly to the GPRS provider over a leased dedicated line.
The network operator then normally assigns a fixed IP address.
– Fixed IP address from Internet Service Provider
The partner is available over the Internet and a fixed IP address has been assigned to
it by the Internet service provider. (Can be obtained from several Internet service
providers.)
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