Dexin NDS3524 User manual

NDS3524 DVB-T SD&HD
Encoder & Modulator with USB
--- Home Use
User Manual

Thank you for buying this encoder modulator.
Please read this manual carefully to install, use and maintain the encoder modulator in the best conditions of
performance. Keep this manual for future reference.
Directory
CHAPTER 1 Product Introductions .......................................................................... 1
General Description ................................................................................................ 1
Working Principle .................................................................................................... 1
Technical Specifications .......................................................................................... 1
CHAPTER 2 Safety Instruction and Installations ..................................................... 4
Safety Instructions .................................................................................................. 4
Installations ............................................................................................................. 4
Typical Applications ................................................................................................ 6
CHAPTER 3 Operations and Management .............................................................. 7
CHAPTER 4 How to Upgrade ................................................................................. 11
Appendix ............................................................................................................... 12

1
CHAPTER 1 Product Introductions
General Description
DEXIN NDS3524 HD&SD encoder & modulator is designed based on consumer electronics which allow
audio/video signal input in TV distributions with applications in home entertainment, surveillance control, hotel
Digital Signage, shops etc.
It is an all-in-one device integrating MPEG-4 AVC/H.264 encoding and modulating to convert audio/video signals
into DVB-T RF out.
The signals source could be from STB, satellite receiver, closed-circuit television cameras and antenna etc. Its
output signal is to be received by a DVB-T standard TVs or STBs etc.
Working Principle
Technical Specifications
HDMI Encoding Section
Encoder
DVD
M onitor
Camera
STB / IRD
Closed Circuit TV
PC
Modulator
Combiner
NDS
3524
HD Encoder Modulator
RF in
RF out
TV + AV to the
distribution
network
SAT
Attenuation :
10 dB
A / V Input

2
Video
Encoding H.264 MP@L 3.0/3.1/4.0
Interface HDMI*1
Input Output
Resolution
[email protected]/60p 480@60p
[email protected]/60i 480@30p
576@50i 576@25p
720@50/59.94/60p 720@50/59.94/60p
1080@50i 1080@25p
[email protected]/60i 1080@30p
[email protected]/60p 1080@30p
Aspect Ratio 16:9, 4:3
Bit rate 1.000~18.000 Mbps
Audio
Encoding MPEGI layer 2
Sample rate 48KHz
Bit rate 64, 96,128, 192, 256, 320kbps
CVBS Encoding Section
Video
Encoding H.264 MP@L 3.0
Interface CVBS*1 (RCA)
Resolution
Input Output
480@60p 480@60p
480@60i 480@30p
576@50p 576@50p
576@50i 576@25p
Aspect Ratio 4:3
Bit rate 1.000~18.000 Mbps

3
Audio
Encoding MPEGI layer 2
Interface Analog Stereo/Mono (Unbalanced RCA)
Sample rate 48KHz
Bit rate 64, 96,128, 192, 256, 320kbps
DVB-T Modulator Section
Standard DVB-T COFDM
Bandwidth 6M, 7M, 8M
Constellation QPSK, 16QAM, 64QAM
Code rate 1/2, 2/3, 3/4, 5/6, 7/8
Guard Interval 1/32, 1/16, 1/8, 1/4
Transmission Mode: 2K, 8K
MER ≥31dB
RF frequency 142.5~946 MHz, 1KHz step
RF output level -14~ +6dBm, 0.1db step
System
RF mix in ATT 10 dB
Management Local LCD + control buttons
Language English
LCN Insertion yes
Upgrade USB
General
Power supply DC 12V
Dimensions 183*110*50mm
Weight < 1kg

4
CHAPTER 2 Safety Instruction and Installations
Safety Instructions
WARNING: Hot plug is not allowed since it may cause system halted.
To prevent fire or electrical shock, do not expose the device to rain or moisture.
The encoder modulator is powered with a voltage of 12V DC. The power supply voltage
must not exceed the recommended voltage, which otherwise may cause irreparable damage
to the device and the invalidation of the warranty. Therefore:
 Do not replace power supply with a voltage greater than 12V DC.
 Do not connect the device to the power if the power cord is damaged.
 Do not plug the device into mains supply until all cables have been connected correctly.
 Do not cut the cord.
Avoid placing the device next to central heating components and in areas of high
humidity.
Do not cover the device with elements that obstruct the ventilation slots.
If the encoder modulator has been kept in cold conditions for a long time, keep it in a warm
room minimum 2 hours before plugging into the mains.
Mount the device in vertical position with the connectors located on the top side.
When replacement parts are required, be sure the service technician has used replacement
parts specified by the manufacturer or have the same characteristics as the original part.
Unauthorized substitutes may result in fire, electric shock or other hazards.
Safety check- Upon completion of any service or repairs to this device, ask the service
technician to perform safety checks to determine that the device is in proper condition.
Installations
RISK of damage to the unit
Mechanically handling the unit may result in damage. Do not connect the unit to the power
supply before or during assembly. Connect the unit as below instructed.
NO HOT PLUG AND CONNECT THE CABLE AS FOLLOWING STEPS.

5
1. Mount and tighten the screws and plugs to
secure the unit to the wall. Left 10 cm of
free space around from each unit.
STB/TV.
5. Power supply connection: a) Connect the earth cable; b) Connect the power plug to the unit mains connector; c)
Connect the power plug to the mains socket.
Cascade Installation
NDS3524 unit has 1 TV signal to RF output encoded as DVB-T Digital TV signal.
Several NDS3524 units can be
cascaded in order to increase the
capacity. The maximum capacity
of a series of N units is 1xN
incorporated TV signals. To
cascade 2 or more units, connect
the RF output of the preceding
unit to the TV input (loop-
through)
of the next unit (see right
illustration).
2.
Connect
the signal input in the
respective
connectors
.
The
signal source
can
be from a
surveillance
DVD,
monitor,
set
-
top box, CCTV and etc.
3.
connect
Optionally,
the
loop
-
through RF input
coaxial
cable
.
4.
Connect cable to RF output to
5
2
3
4
1

6
Typical Applications

7
CHAPTER 3 Operations and Management
NDS3524 is controlled and managed through the key board and LCD display.
LCD Display – It presents the selected menu and the parameter settings. The backlight in the
display is on when the power is applied.
LED – These lights indicate the working status
 Power: It lights on when the power supply is connected.
 Alarm: It lights on when the there is error, such as the signal source loss.
 USB: It lights on when the USB properly connected and detected.
Left/Right/Up/Down buttons – Use these buttons to turn the screen pages, shift the target
items by moving the triangle, or change the parameter settings in the program mode. Enter
– Use this button to enter a submenu or save a new setting after adjustment; press it to start
adjusting the value of certain items with Up/Down buttons when the corresponding
underline flash;
Press it to activate the hidden selections and change the setting with Up/Down (or Left/
Right) buttons.
Audio Bit rate Enter Audio Bit rate Enter Audio Bit rate Audio Bit rate
128 *128 ►128 ►192
Menu – Press this button to step back
Lock – Locking the screen / cancelling the lock state, and entering the main menu after the
initialization of the device. After pressing lock key, the system will question the users to save
present setting or not. If not, the LCD will display the current configuration state.
Hue
1
Hue
+
0
01
Hue
+
00
1
Hue
+
00
2
Enter
►

8
When the power is connected, the LCD will start to initialize the program. The LCD menu
goes as below chart.

9

10
1) DVB-T: modulating standard; XX.XXX MHz: the current output frequency; 1080i: video
resolution of signal source; X.XX Mbps: the current encoding bit rate
2) Alarm Status: For example, if the signals lose, it will give alarm and display error type
under this menu. For example: Video Not Lock
3) Uptime: It displays the working time duration of the device. It times upon power on.
4) Encoder Parameters: User can enter the items respectively to set Encoder parameters.
Interface: To select the input port (Auto or HDMI or CVBS), the device will process the
signal from the corresponding interface. Video in Status: User can view the video status
under this menu. Resolution: signal source resolution, read-only. Video Bit rate: adjust in
the range of 1.000~18.000 Mbps. Audio Bit rate: Select audio bit rate among 64, 96, 128,
192, 256, 320kbps.
5) Stream: User can view or adjust TSID (Transport Stream ID), ONID (Original Network ID),
Network ID, Network Name, Program number, LCN (Logical channel number) and etc for
the output TS after enter this menu.
NIT: (Network Information Table) NIT table is a very important table for describing the
network and TS. User can enter the submenus displayed and edit the values or select modes.
6) Country: User can choose country under this menu. There are five options Default,
Australia, New Zealand, Sweden and Italy. If user chooses Default, modulating parameters
need to be set manually through advanced configuration. If choose other four, user do not
need to set RF frequency, Bandwidth, Constellation, FEC, FFT, Guard interval and RF Level.
It will configure automatically according to the Country and Channel. It is a shortcut.
7) Channel: User can choose Channel under this submenu.
8) Bit Rate: User can read the current modulating bit rate and the maximum bit rate 9) RF
Frequency: Adjust it at range of 142.5 MHz to 946MHz. Set it according your regional
situation or inquire your local services.
10) Bandwidth: choose between 6M, 7M and 8M.
11) Constellation: DVB-T modulator contains 3 constellation modes – 64 QAM, QPSK and 16
QAM.
12) FEC: Forward Error Correction rate. It contains 1/2, 2/3, 3/4, 5/6 and 7/8.
13) FFT (Transmission Mode): Select between 2K and 8K.
14) Guard Interval: Select among 1/32, 1/16, 1/8 and 1/4.
15) RF Level: Adjust it at range of -14~ +6dBm.

11
 NOTE: The different combination of bandwidth, constellation, guard interval
and FEC (code rate) will form a different output code rate. Please refer to appendix table 2.
To ensure the output image quality, it is required the output code rate to be higher than 22
MHz.
16) Save Config: Yes/No-to save/give up the adjustment of setting.
17) Load Saved CFG: Yes/No-to load/ not to load the saved configuration.
18) Factory Reset: Yes/No-choose/not choose the factory’s default configuration.
19) LCD Time out: A time limit that LCD will light off. Choose among 5s, 10s, 45s, 60s, 90s and
120s (seconds).
20) Key Password: to set a 6-digit password for unlocking the keyboard.
21) Lock Keyboard: Choose Yes to lock the keyboard, then the keyboard will be locked and
cannot be applicable. It is required to input the password to unlock the key board. This
operation is one-off. (Password forgotten, please use the universal code “000000”.)
22) Product ID: User can view the serial number of this device. It is read-only and
unique 23) Version: It displays the version information of this device. Encoder Modulator:
the name of the device; Ver: version number of this device.
CHAPTER 4 How to Upgrade
NDS3524 encoder modulator is embedded with USB Port for upgrading. The supported file
format is IMG.
USB Port for Upgrade

12
Upgrade steps: Insert USB device→Upgrade automacally(It will need 10-20 seconds to
upgrade.) →Remove USB device→Power off→Power on.
Appendix
Modulation
Constellation
FEC
6MHz Bandwidth 7MHz Bandwidth
8MHz Bandwidth
Guard Interval Guard Interval Guard Interval
1/4 1/8 1/16 1/32 1/4 1/8 1/16 1/32 1/4 1/8 1/16 1/32
QPSK
1/2 The weak ability of error-correcting and anti-interference in this area 6.03
2/3 6.03 5.80 6.45 6.83 7.03 6.64 7.37 7.81 8.04
3/4 6.22 6.58 6.78 6.53 7.25 7.68 7.91 7.46 8.29 8.78 9.05
5/6 6.22 6.91 7.31 7.54 7.25 8.06 8.53 8.79 8.29 9.22 9.76 10.05
7/8 6.53 7.25 7.68 7.91 7.62 8.46 8.96 9.23 8.71 9.68 10.25 10.56
16QAM
1/2 7.46 8.29 8.78 9.04 8.70 9.67 10.24 10.55 9.95 11.06 11.71 12.06
2/3 9.95 11.05 11.70 12.06 11.61 12.90 13.66 14.07 13.27 14.75 15.61 16.09
3/4 11.19 12.44 13.17 13.57 13.06 14.51 15.36 15.83 14.93 16.59 17.56 18.10
5/6 12.44 13.82 14.63 15.08 14.51 16.12 17.07 17.59 16.59 18.43 19.52 20.11
7/8 13.06 14.51 15.36 15.83 15.24 16.93 17.93 18.47 17.42 19.35 20.49 21.11
64QAM
1/2 11.19 12.44 13.17 13.57 13.06 14.51 15.36 15.83 14.93 16.59 17.56 18.10
2/3 14.92 16.58 17.56 18.09 17.41 19.35 20.49 21.11 19.91 22.12 23.42 24.13
3/4 16.79 18.66 19.76 20.35 19.59 21.77 23.05 23.75 22.39 24.88 26.35 27.14
5/6 18.66 20.73 21.95 22.62 21.77 24.19 25.61 26.39 24.88 27.65 29.27 30.16
7/8 19.59 21.77 23.05 23.75 22.86 25.40 26.89 27.71 26.13 29.03 30.74 31.67
Table 1 Recommended MPEG-2 Code Rate