QPSK to QAM Trans Modulator for cable TV (CATV) headend

QPSK to QAM Trans Modulator for cable TV (CATV) headend: Equipment combining QPSK decoding with QAM modulation

QPSK to QAM Trans Modulator for cable TV (CATV) headend

Features

Complying DVB standard signal channel coding

Support full range variable data rate, bandwidth and QAM mode Data stuffing

Super buffer (optional), anti-burst code stream

PID filter, re-reflection, PSI,SI information synchronal updating possible

Automatically code stream stuffing and empty pocket deleting

Code stream real-time monitoring, empty pocket filtering

Support NIT table modifying

Real-time code stream monitoring

PCR adjusting, output symbol rate variable:1-7 Ms/s

Fixed or agile channel output

Providing ASI and DS3 (optional) code stream interface.

Providing RF output monitoring port (-20dB)

Local or Remote administration possible

LCD display, flexible in operating

High reliability design, stable in running

Equipment combining QPSK decoding with QAM modulation

Specification

QAM decoding unit index

 Modulating mode               16, 32,64,128,256 QAM

Symbol rate                       3-7 M baud/s

Correction coding               RS Coding 188/204

Input data rate                    1.5~51 Mbps

Channel data rate               20~56 Mbps

MER                                 >33dB

BER                                  0

 Input interface                     ASI/SPI       DVB standard 

Output

IF Freuency                       36/36.15/36.65/44/70 MHz (optional)

RF Frequency                    47~870 MHz

Output Level                      >=115dBμV

Output level adjustable         0-16 dB (0.5dB stepping)

Impedance                         75Ω

Output return          >=12dB 

QPSK decoding unit index

Frequency range                 950~2150 MHz

Symbol rate                        2~45 Mbaud/s

Frequency stepping             1MHz 

Input

Input level                           -65~-25 dBm

Input port                            F head

Impedance                          75 Ω 

Rolling factor                               35% (square root to cosine) 

FEC built-in decoder                  M=7, convolution bit rate 1/2,2/3,3/4,5/6,7/8 

Miscellaneous

Dimension                                    44mm*482mm*410mm

Temperature                                 0~45operating);-20~80(storage)

Power                   220VAC±10%,50Hz, 25W

QPSK to QAM Trans Modulator for cable TV (CATV) headend