Setting up the SFN Functionality
H.1
SFN Adapter Functionality [MX8400/SWO/SFN]
H.1.1
Overview
The addition of SFN adapter functionality within the MX8400 allows SFN head-end
architectures to be designed without the need for third-party SFN adapters. The
SFN adapter produces an output transport stream which complies with to TS 101
191 V1.4.1.
shows a basic representation of an SFN network.
Sync
system
Sync
system
SFN
Adapter
GPS
10 MHz
1 PPS
GPS
10 MHz
1 PPS
GPS
10 MHz
1 PPS
TS
TS
TS
Distribution
network
Multiplexer
modulator
DVB-T
modulator
DVB-T
Figure H.1 Basic SFN Network
The SFN adapter provides the information within the outgoing transport stream to
allow all Modulators operating within the same SFN network to broadcast in a
synchronized manner. The synchronization of the data broadcast from each
Modulator is achieved by having a common framing structure. That is a common
mapping of transport stream packets to COFDM modulation frames on all
Modulators within the network by using a mega-frame
.
H.1.2
Mega-frame Initialization Packet (MIP)
The SFN adapter dictates the start of the each mega-frame, and the DVB-T
modulation mode determines the mega-frame length. The SFN adapter inserts a
mega-frame initialization packet (MIP) into the outgoing transport stream. One MIP
is inserted in each mega-frame.
1
Mega-frame: A group of transport stream packets that correspond to 8 DVB-T frames in 8K mode or 32 frames in 2K modes, and
containing a single MIP.
2/1553-FGC 101 1014 Uen B
H-3
Summary of Contents for MX8400
Page 1: ...MX8400 Multiplexer Software Version 5 2 0 and later REFERENCE GUIDE 2 1553 FGC 101 1014 Uen B...
Page 26: ...Installing and Powering Up 2 1553 FGC 101 1014 Uen B 2 4 BLANK...
Page 94: ...Operating the Multiplexer using nCompass Control 2 1553 FGC 101 1014 Uen B 4 18 BLANK...
Page 96: ...Preventive Maintenance and Fault finding 2 1553 FGC 101 1014 Uen B 5 2 BLANK...
Page 146: ...Technical Specification 2 1553 FGC 101 1014 Uen B B 20 BLANK...
Page 148: ...Static Parameters 2 1553 FGC 101 1014 Uen B C 2 BLANK...
Page 186: ...Redundancy Modes 2 1553 FGC 101 1014 Uen B E 2 BLANK...
Page 192: ...IP Protocols 2 1553 FGC 101 1014 Uen B F 2 BLANK...
Page 196: ...IP Protocols 2 1553 FGC 101 1014 Uen B F 6 Figure F 3 Editing Stack Download Ports...
Page 198: ...ProMPEG FEC Support for IP Streaming 2 1553 FGC 101 1014 Uen B G 2 BLANK...
Page 204: ...Setting up the SFN Functionality 2 1553 FGC 101 1014 Uen B H 2 BLANK...
Page 212: ...Setting up the SFN Functionality 2 1553 FGC 101 1014 Uen B H 10 BLANK...
Page 214: ...PSIG Support 2 1553 FGC 101 1014 Uen B I 2 BLANK...
Page 220: ...BISS Support 2 1553 FGC 101 1014 Uen B J 2 BLANK...