Pushing streams to ATSC-C with TBS cards¶

Flussonic Media Server allows you to push streams to ATSC-C cable network without need to use additional modulation devices. In this case, a TBS card (currently we support TBS6014) works as a signal generator for modulation of an MPTS (multiplexer), i.e. converting it to QAMB signal that can be transported to cable networks for TV broadcasting.

To configure such a pusher, first add to the configuration a DVB card with the following necessary parameters:

• hw – the device model, its value should be tbs6014
• adapter – adapter number
• port – port number

Example:

dvb_card tbsmod01 {
  hw tbs6014;
  adapter 0;
  frequency 62000000;
  modulation qam256;
  interleave 3;
  gain 5;
  port 0;
  input_bitrate 38;
}

Other optional parameters are:

• frequency — the carrier frequency (MHz) of the multiplexer for this channel.
• modulation — TBS modulation method.
• interleave — use interleaver. The interlaver disperses sequence of bits in bit stream to minimize effect of burst errors during transmission.
• gain — adjust the output gain to the specified value in dB.
• input_bitrate — input bitrate, in Mbps.

You can also add a DVB card via web interface. For this purpose, go to Media > DVB cards and click ADD DVB card. Then, in the new card settings select tbs6014 for the Hw parameter and enter other settings.

Then configure a multiplexer with the option push dvb://tbsmod01. For example:

stream channel1 {
  input udp://239.0.0.1:1234;
}
stream channel2 {
  input udp://239.0.0.2:1234;
}
transponder newMultiplexer1 {
  bitrate 26970k;
  push dvb://tbsmod01;
  program 100 {
    source channel1;
    title Channel1;
    lcn 0;
    service_type digital_tv_avc_sd;
    pid 101 pmt  pmt;
    pid 102 v1 bitrate=2000 pcr ;
    pid 103 a1 bitrate=500  ;
  }
  program 200 {
    source channel2;
    title Channel2;
    lcn 1;
    service_type digital_tv_avc_sd;
    pid 201 pmt  pmt;
    pid 202 v1 bitrate=500 pcr ;
    pid 203 a1 bitrate=100  ; 
  }
}