Skip to content

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 (transponder), i.e. converting it to QAMB signal that can be transported to cable networks for TV broadcasting.

TBS card

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 transponder 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 Config>DVB cards and click ADD DVB card. Then, in the new card settings select tbs6014 for the Hw parameter and enter other settings.

TBS card configuration

Then configure a transponder 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 newTransponder1 {
  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  ; 
  }
}

Note

When choosing the transponder bitrate, keep in mind the used modulation method because it can limit the ability to accept the data. For example, for qam64 modulation the maximal possible bitrate would be 26.90735 Mbit/s, and for qam265 modulation it would be 38.81070 Mbit/s.