User's Manual

Table Of Contents
DIB-500 R4.1 Product description
Constituents
50 Installation, Operation and Service Manual 90DIB500R41IM_FCC02 99.1
Application Gateway (AGW)
The Application Gateway (AGW) facilitates the communication between the
ACCESSNET
®
-T IP network and applications that use the services of the TETRA sys-
tem such as dispatchers, positioning systems (AVL, GIS), voice and data recording as
well as SCADA or SMART-Metering applications.
Packet Data Gateway (PGW)
The packet data service facilitates the efficient transmission of packet data between
mobile stations within a ACCESSNET
®
-T IP network and to connected IP networks.
Possible application scenarios are e.g. database queries or the transmission of data to
control systems (SCADA, Supervisory Control and Data Acquisition).
The Packet Data Gateway (PGW) provides the packet data gateways for mobile sta-
tions. This packet data gateway provides access points for accessing connected IP net-
works of various user organizations.
Telephony Gateway (TGW)
The TGW provides an IP-based telephone gateway between the ACCESSNET
®
-T IP
network and an appropriate VoIP private automatic branch exchange.
Within the ACCESSNET
®
-T IP network, the TGW is logically connected to the Switch-
ing Controller Function (SCF). The signalling of the TGW for the registration and call
control with the telephone system is performed according to the SIP standard (Session
Initiation Protocol). The Real-time Transport Protocol (RTP) is used as the transmission
protocol for the voice. The voice itself is encoded in the G.711 format (A-law or µ-law).
3.1.5.3 Multi Processor Server Unit (MSU)
The MSU is a hardware component. It serves as a hardware platform for the Processing
Unit Controller (PUC) software component. It provides four Ethernet interfaces.
In addition, a GPS module is installed in the MSU that is responsible for providing the
clock and time reference signals (synchronization) required for switching connections.
The MSU components are described in detail in the following sections.
PowerPC
The PowerPC is a hardware component and distributes the GPS reference signal,
which it receives from the GPS module, to the IntelPC with the help of the Network Time
Protocol (NTP). If connected network elements, such as an IP node (IPN), do not fea-
ture their own GPS reference signal, they can be supplied with the GPS time via the
PowerPC of the DIB-500 R4.1. In addition, the PowerPC serves as hardware platform
for the software component Processing Unit Controller (PUC).