Battery charger for the PUMA T2 hand-held radio
Technical Manual
TETRA network overview
Page 18
OTE Proprietary Information
P/N: 779-0357/02
Revision 04
2.2
TETRA NETWORK EQUIPMENT
In this chapter the main charachters of the TETRA radio communication system
are briefly described (see fig. 2.1). Both the equipments of the infrastructure and of
the terminals are taken into consideration.
2.2.1
Radio Base Station (BS)
The Radio Base Station (BS) is a network element used to realize the
electromagnetic coverage of a certain cell and to guarantee 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.
2.2.2
Switching and Control Node (SCN)
Another element which is part of the TETRA network is the SCN, Switching and
Control Node. The system switching capacity are mainly concentrated in the SCN,
which, infact, controls a certain number of radio base stations, dispatch stations
and even other SCNs.
Moreover, the SCN, by using an ISI (Inter System Interface), can interface itself
with other TETRA networks and other external networks (e.g. ISDN, PSTN, PABX
etc..) through a gateway.
2.2.3
Network Management System (NMS)
The management of the TETRA network is done through the NMS (Network
Management System) which is implemented on a single dedicated station. The
NMS can control a certain number of SCNs and supervise the whole network
system.
2.2.4
Control Room Server (CRS)
The Control Room Server (CRS) costitutes 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).
2.2.5
WDS, RDS and LDS
There are different types of dispatch stations:
•
WDS;
•
RDS;
•
LDS.
The WDS is managed by an operator through a fixed terminal; the connection to
the SCN is guaranteed by a WAN (Wide Area Network).
