Siemens SIMATIC NET TeleControl SINAUT ST7, Системное руководство

Страница: 148 / 294

Installation and commissioning of the modems and routers
5.4 GPRS/GSM router MD741-1
SINAUT ST7 station control system
148
System Manual, 09/2016, C79000-G8976-C178-10
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.)
5.4 GPRS/GSM router MD741-1
Introduction
The following section describes the design of the MD741-1 router, its connectors and display
elements.
Note that this product is being discontinued. As a substitute, you can for example use the
2.5G router SCALANCE M874. For the manual see /3/ (Page 272).