Modulator SFN/MFN ASI-TS MPEG -> DTMB Promax MO-280

Cod: Promax MO-280


 

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Descriere

The MO-280 is a professional SFN/MFN DTMB modulator fully compliant with the GB20600-2006 and the GY/T 229. 1-2008 standards contained in a 19" 1U chassis. The unit has two serial ASI MPEG-2 TS inputs, one 10 MHz GPS reference input and one 1pps GPS reference input. The GPS inputs are used in combination with the Second Frame Initialization Packet (SIP) embedded in the transport streams for SFN synchronisation purposes.

In MFN mode, the MO-280 is able to work with any incoming bit rate as long as the net bit rate resulting from dropping all NULL packets present in the stream is strictly lower than the value given in the DTMB specification for the modulation parameters in use.

Two test modes are available in the MO-280 DTMB modulator, single tone output and test TS generation.

 

 

MPEG-2 TS INPUTS

2xSerial ASI-TS MPEG-2 inputs
TS packets of length 188 or 204 bytes (automatic detection)

SYNCHRONISATION (GPS)
  Inputs
  Outputs


10 MHz input and 1 pps input
10 MHz output

OUTPUTS
  IF Output
  RF Output


31 to 26 MHz (1 Hz steps). MER > 43 dB
45 to 875 MHz (1 Hz steps). MER > 38 dB

DTMB PARAMETERS
  Carrier mode
  Frame header length
  Frame header phase
  FEC rates
  Constellations
  Time interleaving
  MFN operation


Single, Multicarrier
420, 595, 945 symbols
Fixed, Rotating
0.4, 0.6, 0.8
4QAM-NR, 4QAM, 16QAM, 32QAM, 64QAM
240, 720
Available

TESTS MODES

- Generate a single carrier at the channel central frequency whose level equals the average DTMB output power.
- Internal generation of test TS using PRBS sequences (length 15 / 23 embedded within NULL packets)

 

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