Gsm Modem Md720-3 - Siemens SINAUT ST7 System Manual

1. With the GSM modem MD720-3
2. With the GPRS modem MD741-1
1.5.2

GSM modem MD720-3

With the GSM modem MD720-3, a TIM can transmit data by establishing a dial-up
connection over a mobile wireless network. The maximum data transmission speed is 9600
bps.
For data transmission, you can choose between two transmission methods:
● Transmission using CSD (Circuit Switched Data)
● Transmission via GPRS using the MSC protocol
Station control system
System Manual, 07/2009, C79000-G8976-C178-07
– Data transmission on an "as necessary" basis by establishing a dial-up connection via
a mobile wireless network (CSD: Circuit Switched Data)
Dial-up connections are charged on a pay-by-time basis.
– Data transmission with GPRS in a mobile wireless network
Authentication and encryption are based on the MSC protocol. Charges are generally
on a pay-by-volume basis.
With both transmission methods, the transmission of SMS messages to standby
personnel is also possible. Charges are based on the number of sent SMS messages.
Permanent online connection between station and control center using the GPRS service
(General Packet Radio Service) of a GSM provider. Data can be transmitted immediately
at any time.
Although permanently online, only the volume of transmitted data is charged.
To communicate with remote devices, the MD741-1 establishes a VPN tunnel and
encrypts according to the IPSec protocol.
– Data can be transmitted between two SINAUT subscribers both from mobile wireless
to mobile wireless(from GSM modem to GSM modem) and from mobile wireless to
fixed network (phone or ISDN attachment; ISDN is recommended). With this type of
data transmission, the GSM provider charges according to the time the dial-up
connections were established.
– When using CSD, apart from transmitting data, the MD720-3 can also be used to send
SMS messages directly to personnel on call. Receipt of an SMS can be acknowledged
using the mobile phone. If no acknowledgement is received, it is possible to send the
SMS to a different mobile phone. The GSM provider charges according to the number
of sent SMS messages.
The data transmission between station and master station is via GPRS in the mobile
wireless network. To allow direct communication between stations, the master station
forwards the messages to the target subscribers. The GSM provider generally charges on
a pay-by-volume basis.
Introduction to the SINAUT ST7 system
1.5 Mobile wireless components
39