Vaisala Hydromet Data Collection Platform - Manual (Page 34)

User's Guide ______________________________________________________________________
32 __________________________________________________________________ M210933EN-C
Cellular Modems
The GSM/GPRS module provides wireless telemetry for remote
stations.
MC35 is a GSM Terminal with GPRS (General Packet Radio Service)
capability. It offers a wireless TCP/IP connection directly from the
QML logger to send data via Internet. In practice, GPRS connectivity
means the measuring system is online all the time. Data is available
immediately even from a large number of stations. Secondly, data is
transferred automatically into files on the user's hard disk, without
polling or other data collection functions.
GPRS connectivity can be used, for example, for sending reports and
log files to an FTP server or for forming a TCP/IP-based service
connection for maintenance purposes.
0410-010 Figure 3 GSM Terminal MC35
The GSM antenna that is used with the GSM data modems is a
directional antenna. The antenna provides high gain, enabling the data
communication even in remote and sparsely-populated installation sites
where long distances or the terrain cause uncertain connections. In
addition to giving a good connection, a strong signal also reduces the
power consumption at the station.
The antenna cable is a high-quality coaxial cable. The radio modem is
protected against high voltages using a surge arrestor installed on the
antenna cable input.