Specifications
low latency 4HD to DVB-C modulator
4*HDMI/SDI in, 1*ASI in
MPEG2 HD/MPEG4 HD video encoding
4*DVB-C out
NDS3542A low latency 4HD to DVB-C modulator
4HDMI to DVB-C
4SDI to DVB-C
Product overview
NDS3542A series products are DEXIN’s new breakthrough all-in-one devices which integrate encoding (MPEG-2 HD/SD, MPEG-4/AVC H.264 HD/SD) and modulating to convert V/A signals into DVB-C RF output. It has equipped with 4 HDMI (4 SDI optional) channels input and 1 ASI input and output with 2 ASI ports and 1 UDP IP (4*SPTS) port.
Delay problem has been greatly reduced to achieve an extremely low value from the encoding progress to the decoding terminals.
It adopts inner drawer-type structural design which greatly facilitates the change of encoding modules (HDMI/SDI /…) as needed.
The signals source could be from satellite receivers, closed-circuit television cameras, Blue-ray players, and antenna etc. Its output signals are to be received by DVB-C TVs or STBs and etc.
Key Features
* MPEG2 & MPEG4 AVC/H.264 HD/SD encoding
*Up to 1920*1080@50P/60P supported (MPEG4 AVC/H.264)
*Up to 1920*1080@50I/60I supported (MPEG2 HD)
* 4* HDMI/SDI input
*1*ASI input for re-mux; 1*RF input for mix
*Simultaneously encoding each channel more than 10Mbps
*4* DVB-C RF out (4 carriers combined output)
*Support 4 * SPTS output
*Extremely low delay
* LCN support (Logical Channel Number)
* Excellent modulation quality MER≥42dB
* RF Frequency range 30Mhz~960Mhz
* LCD display, Remote control and firmware
* Web NMS management; Updates via web
* Lowest cost per channel
Principle chart
Specifications
Encoding section
Video
|
Encoding
|
MPEG2, MPEG4 AVC/H.264
|
|
Input
|
HDMI*4 (or SDI*4)
|
|
Resolution
|
1920*1080_60P, 1920*1080_50P, (-for MPEG4/H.264 only)
1920*1080_60i, 1920*1080_50i,
1280*720_60p, 1280*720_50P
720*480_60i, 720*576_50i
|
Audio
|
encoding
|
MPEG1 Layer II, MPEG2-AAC, MPEG4-AAC
|
|
Sample rate
|
48KHz
|
|
Bit rate
|
64kbps, 96kbps,128kbps, 192kbps, 256kbps, 320kbps
|
DVB-C Modulator Section
|
Standard
|
J.83A , J.83B, J.83C
|
|
MER
|
≥42dB
|
|
RF frequency
|
30~960MHz, 1KHz step
|
|
RF output level
|
-30~ -10dbm(81~97 dbµV), 0.1db step
|
|
J.83A
|
|
|
Constellation
|
16/32/64/128/256QAM
|
|
Symbol rate
|
5.000~9.000Msps adjustable
|
|
bandwidth
|
8M
|
|
J.83B
|
|
|
Constellation
|
64QAM/ 256QAM
|
|
bandwidth
|
6M
|
|
J.83C
|
|
|
Constellation
|
64QAM/ 256QAM
|
|
bandwidth
|
6M
|
System
|
Local interface
|
LCD + control buttons
|
|
Remote management
|
Web NMS
|
|
output
|
ASI out (BNC type); 4*SPTS out (RJ45, 100M
|
|
NMS interface
|
RJ45, 100M
|
|
Language
|
English
|
General
|
Power supply
|
AC 100V~240V
|
|
Dimensions
|
482*400*44mm
|
|
Weight
|
4.5 kgs
|
|
Operation temperature
|
0~45°C
|
Why do we need 4 x DVB-C carrier output in one device?
Firstly, it is to guarantee the sound picture quality of HD programs.
As we all know, to guarantee the picture quality of 1920x1080@50I/60I resolution HD program, the video bit-rate may exceed 10Mbps and even reach up to 15Mbps. However,
when the modulating constellation is 64QAM, the maximum possible bit-rate output for single DVB-C carrier is only around 20Mbps.
15Mbps x4 =60Mbps > 20Mbps.
It means the single DVB-C carrier simply can't carry the 4 channels 1080i HD program if the average bit-rate exceeds 10Mbps.
That's why we design 4*DVB-C carrier modulation board which quadruples the maximum possible bit-rate bandwidth up to 80Mbps and above when 64QAM constellation is used. This rightly makes it reliably carry 4 channels MPEG2 HD programs output simultaneously.
Below brief chart will help to more clearly illustrate the working principle.
Secondly, it is cost-saving.
Its high integration allows users to transmit more programs with fewer devices. It undoubtedly saves the cost for you and me.
About Dexin Digital Technology Co.,Ltd
