MO-170 DVB-T and DVB-H Modulator0 pages

6, 7 & 8 MHz channel bandwidths(user-selectable) 2k, 4k & 8k modes Master and slave operationFrequency agility (1 Hz step) Hierarchical modesHigh MER DVB-T and DVB-H (*) Modulator MO-170 General overview

The MO-170 is a general purpose DVB-T/H modulator containedin a 19" 1U chassis. The unit has three selectable MPEG-2 TS
inputs (two serial ASI inputs and one parallel SPI input).Either of these inputs can be used to modulate the COFDM signal in both MO-170 (blan-king of carriers, single tone output, test TS generation, CBER andVBER injection). hierarchical (one TS input) and non-hierarchical (two TS inputs) modes. An additional test TS can be generatedinternally in the modulator. This allows to generate compliant DVB-T/H signals even in the absence of a valid TS input. In DVB-H only features are 4k carriers, two extra TPS signalling bits(time slicing and MPE-FEC), native/in-depth symbol interleavingand selectable transmitter cell ID.The operation of the slave mode, the useful bit rate at the TS input to the COFDMmodulator has to be the one defined in ETSI EN 300 744 for eachchoice of DVB-T/H transmission parameters. When using hierarchy, the user has to choose which TS (HP or LP)the selected TS input is mapped to. The other hierarchical TS isgenerated internally as a PRBS test sequence.In MO-170 is done via the front panel LCD display and controls. The modulator can be easily configured by navigating through the intuitive set of menus. master mode, the MO-170 is able to work with any incoming bit rate as long as this is strictly lower than the value given in the
DVB-T/H specification for the modulation parameters in use. The input TS bit rate is adapted to the useful bit rate required by the DVB-T/H signal by stuffing the TS with NULL packets (packet
stuffing). This stuffing process alters the sequence of PCR values
embedded in the TS. These values have to be re-stamped for theresultant PCR jitter to remain within the limits specified by the DVB.
In hierarchical modes, operating the MO-170 as master has theadded advantage over the slave mode of being able to use any ofthe three TS inputs as the HP input, LP input or both.The modulator can be configured to generate any of the transmission modes listed in the DVB-TH specification. In hierarchical modes, the HP and LP streams can be encoded with
different convolutional code rates. The channel bandwidth can beset by the user to 6, 7 or 8 MHz as required by the application. Several test modes are available in the >

Control interface

-Pushable rotary control on the front panel with navigation key and LCD display-Two LEDs indicating the power and synchronisation status of the equipment-RS232 DB9 male connector (*): DVB-H operation available as an option >