DVB-T Modulator (COFDM) for TERRA MMH-3000

View of the module

TRX-360 R81709 modulator ("remultiplexer") can multiplex up to 6 transport streams (MPEG-2 TS) and convert them into COFDM modulated DVB-T RF channel (multiplex). This module has been designed for use in the MMH-3000 headend.

The modulator has 6 inputs for feeding MPEG-2 TS streams. The digital data streams are provided by RDC-313 R81710, DM-313 R81712, or MD-330 R81713 (encoder) modules. The RDC-313 and DM-313 modules provide whole satellite transponders received by the headend. The user can remultiplex the streams, i.e. select interesting channels and place them in the output multiplex in DVB-T standard.

The maximum bitrate at the output of the modulator is 31.66 Mb/s. In practice, it translates into 6-7 channels of standard definition (SD) or 2 channels in high definition (HD). Remultiplexing the streams, the user should include a 10% safety margin (by determining the maximum bit rate for the whole multiplex, which should not exceed 29 Mb/s).

If the user wants to put into the DVB-T multiplex some other signal (coming from media player, DVD player, analog camera etc. as baseband video), the indispensable component of the headend will be MD-330 R81713 encoder converting the analog signal into digital MPEG-2TS stream. The stream directly enters the TRX-360 modulator and then is distributed via DVB-T multiplex, with other programs.

The TRX-360 R81709 modulator, similarly to all components of TERRA headend, can be configured using free Terra Link or paid CMH Master R81706 software.

View of the main configuration window of TRX-360 R81709. Input channel 1 provides MPEG-2 TS at a bitrate of 42.59 Mb/s). Entering the TS 1 card, the user can select specific programming and services.

Selection of specific programming and services in the digital stream entering the first input of the modulator

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The module contains electrostatic sensitive components. To minimize electrostatic discharge, observe the following precautions: