Functional Description 25
ID: um_t2gateway CP560 DVB-T2 Gateway User’s Manual Rev. 2.2 (3686)
TS
BBFRAMEBUILDER
TS Packetizer
Clock & Time
base
T2MI TS
T2
config
Scheduler
config
Rate Control
1PPS
Time stamp
L1 signaling
Figure 5.3 DVB-T2 Gateway module
The DVB-T2 Gateway module illustrated in figure 5.3 is the main module of the CP560, it en-
capsulates TS-input packets in Baseband frames, generates an accurate timestamp and generates
L1-signalling frames. The resulting T2-MI frames are packetized and encapsulated again in TS
packets to be transported over a network.
According to the DVB-T2 frame structure, T2-MI frames carrying user data are sent first followed
by a timestamp frame and a L1-frame. The time stamp frames and L1-frames are generated
accordingly to the settings defined in the user interface.
The DVB-T2 packet bitrate is kept constant by the time source or the 1PPS signal, this prevent
the overflowing of the buffer on the modulator side when the unit and the modulator uses the
same time source.
5.7 Management sub-system
The management subsystem is a set of modules that handles all the interfaces to monitor and
control the operation of the CP560.
The management subsystem communicates with the users, both humans and machines, via the
following interfaces:
• Front panel and back panel LEDs for status
• Graphical user interface via Flash application in WEB browser
• SNMP traps on alarms
• SNMPv2c Agent
• TXP (T-VIPS XML Protocol) to retrieve and set configuration and status
• Alarm relays on alarms
• SNTP client for real time clock synchronisation
• Terminal interface either over Telnet or USB interface for debugging
• FTP server for direct file system access
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