VS 2001
Technical Handbook
Accessories
P/N: 779-0373/02
Revision 02
Marconi Proprietary information
Page 5
1.2.1
TETRA network equipment
In this paragraph the main characteristics of the TETRA radio communication
system are briefly described (see Fig. 1.1). Both the infrastructure and the
terminals are taken into consideration.
1.2.1.1
Radio Base Station (BS)
The Radio Base Station (BS) is a network element used to provide the
electromagnetic coverage of a certain cell and the radio connection with the user
terminals. Each base station is able to manage many RF carriers; each RF carrier
manages four channels.
The radiating system of the Radio Base Station is suitably configured depending
on the present requirements.
1.2.1.2
Switching and Control Node (SCN)
Another element of the TETRA network is the Switching and Control Node (SCN).
The system switching capacity are mainly concentrated in the SCN, which controls
a certain number of Radio Base Stations, dispatch stations and even other SCNs.
Moreover, by using an ISI (Inter System Interface), the SCN can interface itself
with other TETRA networks and other external networks (e.g. ISDN, PSTN, PABX
etc..) through a gateway.
1.2.1.3
Network Management System (NMS)
The management of the TETRA network is accomplished by the NMS (Network
Management System) which is implemented on a single dedicated station. The
NMS can control a certain number of SCNs and can supervise the whole network
system.
1.2.1.4
Control Room Server (CRS)
The Control Room Server (CRS) constitutes the interface between the TETRA
system and the room operators. It manages a certain number of external working
stations connected, for example, through a LAN (Local Area Network).
1.2.1.5
WDS, RDS and LDS
There are different types of dispatch stations:
•
WDS;
•
RDS;
•
LDS.
The WDS is managed by an operator with a fixed terminal; the connection to the
SCN is guaranteed by a WAN (Wide Area Network).
The RDS is the radio dispatch station and it is managed by an operator with a
terminal; this time the connection to the system is carried out via radio.
