Introduction to the SINAUT ST7 system
1.5 Mobile wireless components
Station control system
System Manual, 07/2009, C79000-G8976-C178-07
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1.5.3
EGPRS/GPRS modem MD741-1
Using the EGPRS/GPRS modem MD741-1 (or the predecessor module MD740-1), a TIM
can establish a permanent connection between a station and control center using the GPRS
service of a GSM mobile wireless provider. Since the connection is always online, data can
be sent as soon as it becomes available.
Apart from GPRS, the faster service EGPRS (EDGE) is also supported.
The control center must be permanently reachable from the GPRS network. This can be via
a dedicated line between control center and GPRS provider or a permanent connection from
the control center to the Internet, for example DSL.
A direct GPRS connection from GPRS modem to GPRS modem is not possible. Direct data
exchange between two SINAUT ST7 stations that both communicate over GPRS is possible
over a TIM module in the control center.
Since the data transmission from the GPRS provider to the control center is often over the
Internet, the MD741-1 has an integrated VPN router and a firewall. This allows GPRS
connections with optimum security to be established between the station and control center.
The maximum data transmission speed with GPRS is 54 Kbps.
The MD741-1 can be connected to the Ethernet connector of any Ethernet TIM. It can be
installed on a 35 mm standard rail.
