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6.3.2
Connecting the MD740-1 to the TIM and antenna
The following figure shows how the GPRS modem MD740-1 is connected to a TIM over its
Ethernet connector (IE) and how the SMA connector is connected to an antenna.
Figure 6-4
6.3.3
Prerequisites for operation
To use the MD740-1, the following requirements must be met:
● 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 MD740-1 to establish a VPN connection actively, the partner must have a fixed
IP address. (An IP address consists of a maximum of 4 three-digit numbers separated by a
period, for example: 255.122.201.115). 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
● Fixed IP address from Internet Service Provider
● Fixed DNS name from DynDNS service
SINAUT ST7 Station control system - System Manual
System Manual, 05/2007, C79000-G8976-C178-06
s
SET
Connecting the MD740-1 to a TIM and an antenna
The partner is connected directly to the GPRS provider over a leased dedicated line. The
network operator then normally assigns a fixed IP address.
The partner is available over the Internet and a fixed IP address has been assigned to it
by the Internet service provider. (Can be applied for from several Internet service
providers.)
To solve the problem of dynamic IP address assignment, DynDNS services can be used.
With such a service, the partner can be reached using a fixed domain name regardless of
its current dynamic IP address. Each time the IP address changes, the partner signals
the new IP address to the DynDNS server so that the domain name on the DNS server is
always assigned to the current IP address. Use of a DynDNS service is subject to
entering a contract with a suitable provider, for example DynDNS.org or DNS4BIZ.com.
Installing and putting a SINAUT modem into operation
6.3 GPRS/GSM wireless modem MD740-1
235
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