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Transmodulator equipped with remultiplexing

Transmodulator equipped with remultiplexing

Single transmodulator

DVBS/S2 - DVBT, with/without CI

The transmodulator receives a SAT transponder in DVBS (QPSK) or DVBS2 (QPSK /8PSK) modulation and demodulates it, producing an MPEG-2 transport packet. The MPEG2 transport packet is subsequently modulated in COFDM and converted into the output channel (UHF or VHF, with a 7/8 MHz bandwidth), using an agile up-converter.
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Grouped product items
Ref. 563101 Not equipped with CI
Ref. 563301 Equipped with CI
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  • Total or selective removal of the services present in the received transponder, to avoid them being detected (and memorized) by the receivers (STB)
  • Editable TS_ID, which makes programme/service detection easier on the receiver (STB), since the channel scan is based on this identifier
  • LCN (Logical Channel Number) allows the assignment of the services present in the output to an LCN, which makes the ordering of the channels easier on the receivers (STB)
  • Provides information regarding both the occupation of each specific service and the global output occupation, which allows the optimization of the services being distributed
  • Can be remotely controlled using CDC (Headend control)
  • Device monitoring and signal status LEDs

Main features
  • S_ID editable to prevent the receivers (STB) in an installation from retuning when the output-Multiplex's services are modified
  • Editable Network_ID, Original Network_ID and Cell_ID allow the control of network identifiers
  • The encrypted satellite channels are transformed into free DTT services through the CI interface and the appropriate CAM module. Depending on the CAM type used (standard/professional), one or several services may be opened for free reproduction

References 563101 563301/563302
SAT INPUT SAT Input frequency range MHz 950...2150
Frequency steps 1
Input level dBμV 49 - 90
Loop-through losses dB ≤ 1,5
LNB powering Vdc 13V/17V/ OFF - 22KHz (ON/OFF)
Input return losses (typ.) dB > 10 
Input impedance Ω 75
DVB-S Symbol rate (Modulation) Mbaud 2 - 42,5 (QPSK)
FEC inner code Viterbi (1/2, 2/3, 3/4, 5/6, 7/8)
FEC outer code RS (188/204)
Roll-Off factor % 20, 25, 35
DVB-S2 Symbol rate (Modulation) Mbaud 10 - 30 (QPSK, 8PSK)
FEC inner code LDPC (1/2, 1/3, 1/4, 2/3, 2/5, 3/4, 3/5, 4/5, 5/6, 8/9, 9/10)
FEC outer code BCH (Bose-Chaudhuri-Hocquenghem)
Roll-Off factor % 20, 25, 35
DTT OUTPUT COFDM Modulation (Constellation) COFDM (QPSK, 16QAM, 64QAM)
Guard interval μs 1/4, 1/8, 1/16, 1/32
Scrambling DVB EN 300744
Interleaving DVB EN 300744
Convolutional code (FEC) Viterbi (1/2, 2/3, 3/4, 5/6, 7/8)
PCR Correction
Services deleting
Original Network_ID
Spectral inversion Normal, Inverted
Channel bandwidth Mhz 7,8
RF Output frequency 177 - 266 / 474 - 858 MHz (channel mode)
45 - 862 MHz (frequency mode)
Frequency steps KHz 166
Output level (max. typ.) dBμV 85 ± 5 
Output level regulation margin dB >15
Output loop-through losses ≤ 1,5
Output return losses (typ.) > 10
Output impedance Ω 75
GENERAL Powering voltage
Vdc 24
Consumption mA 270 mA (0 LNB)
480 mA (1 LNB)
280mA (0 CAM - 0 LNB)
330mA (1 CAM - 0 LNB)
500mA (0 CAM - 1 LNB)
540mA (1 CAM - 1 LNB)
Protection index
IP 20

The front LED of a T.0X DVB-S/S2-COFDM transmodulator does not only indicate whether the equipment is on or off. It can have different meanings, depending on the colour displayed. Here is how it works.

If both the signal and the module configuration are correct, the LED colour will be green; a yellow colour indicates low signal.

If the LED colour is red, either no signal is present or some of the transmodulator blocks is not correctly configured. However, a red colour does not always mean failure or bad configuration.

The LED colour will also be red in case some TVSAT service has no content (very common situation for paid services that transmit specific events). As soon as the operator activates the service (start of event transmission) the colour will shift to green (or yellow, depending on the input level)

Does a red LED in a T.0X transmodulator mean bad operation?

Block diagram