Technology
User Manual for AZ110 Broadcast Satellite Modulator with ASI interface
version 3.2
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SHAPING THE FUTURE SATELLITE OF COMMUNICATIONS
7.3.1
Processing Mode - ASI(TS)
Air(TS)
A typical application for the “ASI(TS)<->Air(TS)” processing mode is a DTH
application whereby a TV bouquet is distributed to many subscriber set-top-boxes.
Figure 43 - Typical Application - DTH
•
The ASI interface carries transport stream packets; the satellite interface also
carries transport stream packets;
•
Supports DVB-S and DVB-S2 single-stream modulation;
•
In DVB-S mode, the transport stream packets are directly modulated towards
the satellite link. In DVB-S2 mode, the transport stream packets are packed into
DVB-S2 baseband frames before being modulated.
This single-stream processing mode allows transport stream packets to be
forwarded between one of the ASI interfaces and the satellite interface. The other
ASI interface can only be used for redundancy (future release), or for duplicating
the outgoing transport stream.
In this processing mode, the system supports various manipulations to the
transport stream, such as:
•
Rate limitation;
•
Rate adaptation with or without null-packet stuffing;
•
Conversion of 204 bytes MPEG frames to 188 bytes MPEG frames.
