JXDH-6405 DVB-T Modulator converts input data streams into frequency signals, it meets DVB-T standard. Signals from MPEG-II compact encoder or multiplexer was sent into DVB-T modulator. According to DVB-T standard, such as FEC, interlacing, RS error correction encoding, etc. After IF processing and up-converting into the range of TV channels, signals can be transmitted through HFC and MMDS networks. Its widely used in digital TV, data broadcasting, VOD, Internet, video conference SV.
Features
* Comply with EN300744 standard; support 6MHz/7MHz/8MHz band width
* Error correction follows DVB-T standard
* Operable in QPSK, 16QAM, 64QAM mode
* Support 2K/8K carrier-wave operating mode
* FEC encode supports 1/2\2/3\3/4\5/6 and 7/8
* Secure time interval supports 1/4\1/8\1/16\1/32
* Input interface: ASI and SPI(DS3/E3 optional)
* Input bit rate::1.5~31.67Mbps
* Output band width: 6/7/8MHz
* RF output: 48~860MHz
* Output level: 105dBuV~115dBuV(step adjustable)
* 188 and 204 packet automatic identification; shows real-time data format
* Adopt high capability buffer; ASI interface supports burst and equality TS, while re-construct equality TS.
* Advance output TS efficiency
* Capable of NIT mapping and sending; supports over 44 NIT mapping frequency
* Holds 10 groups of PID filtering and re-mapping function
* Support all PSI/SI data abstraction, modification and analysis
* Inserting SI data
* Null packet filtering and filling
* Performs multiple PCR correction simultaneously
* Monitor and test real-time enter/valid bit rate
* Self-adjust filter circuit design in order guarantees superb SNR (out of band)
* -20dB RF test output is available (IF output is also available)
* Failure alarming
* LCD display
* With RJ45, actualize central NMS, distant upgrade/maintenance (NMS software is optional)
* Power off memory
Specifications
ASI Interface (Asynchronous Serial interface)
Input | Connector | BNC |
Impedance | 75Ω | |
Packet format | 188 or 204 bits (without channel coding) | |
Access data rate | 270Mbps | |
Max valid bit rate | 31.67Mbps | |
DVB standard | supports burst and equality TS | |
Loop output | Connector | BNC |
Impedance | 75Ω |
SPI input interface (Synchronous Parallel interface)
Connector | DB-25 female |
Packet format | 188 or 204 bits(without channel coding) |
DVB Standard | LVDS |
IF interface
IF input | Connector | BNC |
Impedance | 50Ω | |
IF frequency | 36MHz/35.25/36.15/44MHz(optional) | |
IF Bandwidth | ≤8MHz | |
Reflect loss | ≥18dB | |
Input level | 95dBuV(rms) | |
IF loop output | Connector | BNC |
Impedance | 50Ω | |
IF frequency | 36MHz/35.25/36.15/44MHz( optional ) | |
IF Bandwidth | ≤8MHz | |
Reflect loss | ≥18dB | |
Output level | 95dBuV(rms) |
RF interface
RF output | Connector | BNC |
Impedance | 75Ω | |
Output Frequency | 48MHz~860MHz(in segment) | |
Reflect loss | ≥15dB | |
Output level | 105dBuV~115dBuV(adjustable) | |
Carrier rejection | >55dB | |
MER | ≥42dB | |
SNR(out of band) | ≥50dB | |
RF output for test | Connector | BNC |
Impedance | 75Ω | |
Output level | 85dBuV~95dBuV(adjutable) |
Channel signal encoding
Constellation | QPSK,16QAM,64QAM |
Channel encoding | RS encode, DVB standard |
FEC encoding | 1/2\2/3\3/4\5/6\7/8 |
RS encoding | 204byte mode |
IFFT | 2K/8K |
Secure time interval | 1/4\1/8\1/16\1/32 |
MER | ≥44dB |
SNR(out of band) | ≥50dB |
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