Dexing

TEST REPORT Professional Integrated Receiver and Decoder

Desing
NDS3975

• LCD video monitor on front panel
• tuners for DVB-S2, DVB-T, DVB-C and ISDB-T available
• integrated re-multiplexer
• simultaneous support of tuner, IP and ASI input on
the incoming side, as well as IP and ASI on the outgoing
side
• supports 2 x CAM

80 TELE-audiovision International — The World‘s Largest Digital TV Trade Magazine — 01-02/2013 — www.TELE-audiovision.com www.TELE-audiovision.com — 01-02/2013 — TELE-audiovision International — 全球发行量最大的数字电视杂志 81

TEST REPORT Professional Integrated Receiver and Decoder

IRD with 0.61
three different inputs ■ Illustration 1: Versatility
of IRDs

The NDS3975 is shipped - 1 ASI input nal monitor for most pur- - signal output with very
in a rather plain-looking - 4 ASI outputs poses. There’s even a small good quality
cardboard box, yet as soon - 1 tuner input (DVB-S2/ switch to turn it on or off, so - low maintenance costs
Of course the NDS3795
as you open the packaging C/T as selected, our test that it stays dark whenever The NDS3975 receives
features a re-multiplexer
you learn that looks can be unit was equipped with a it isn’t required. high scores for each of these
which can be set up to re-
deceiving: Out comes a top- DVB-S2 tuner) In addition, the front panel demands, and yet it offers
bundle channels of the three
notch product that is pro- - 1 HDMI port is characterised by six sta- so much more. It’s best to
received transport stream
tected by foamed material - 1 composite video output tus LEDs (Power, Tuner Lock, have a look at illustration 1
into a new transport stream
on all sides, plus all cables - 1 audio output (L+R) ASI Lock, IP Lock, Decoder to get an impression of its
without any limitations grated MPEG-2/MPEG-4 de- sports an integrated BISS tions like PowerVu, for ex-
that are required to get go- - 1 YbPbR component out- OK and Alarm), plus two CI versatility.
whatsoever (‘muxing’). The coder can even provide the decoder goes to show that ample, which would cause
ing in a flash. You’ll find put slots on the right side, which The main difference be-
newly multiplexed stream is selected channel as HDMI, the manufacturer Dexing incompatibilities on too
the power cable as well as What truly set our hearts turned out to be compat- tween the NDS3975 and
then made available via the SDI or CVBS. This is also the has tried to really meet all many levels. BISS is an open
cables for ASI, YbPbR and ablaze, however, was a sec- ible with all our CAMs except standard IRDs can be found
two ASI outputs as well as channel that can be viewed customer demands. BISS is platform which can easily
composite video. ond look at the front panel: those working with the CI+ right at the beginning of this
through the network inter- on the built-in mini moni- short for Basic Interoper- be implemented by manu-
The IRD (integrated re- Apart from the two-line LCD standard. report: It features three
face for further processing. tor, which means the NDS able Scrambling System and facturers without any has-
ceiver decoder) NDS3975 is display, which is extremely When we think of integrat- usable inputs, instead of
Illustration 2 gives an ex- can at the same time pro- was defined by the European sles. As far as broadcasting
designed with the standard easy to reads thanks to its ed receiver decoders (IRD), one tuner only. While the
ample of how a typical cable vide analog video signals for Broadcasting Union in order companies are concerned,
19-inch rack width in mind blue backlighting, two arrow we usually have in mind pro- tuner itself is exchangeable
head-end could look like. CATV, for example. to allow encryption for occa- BISS offers the benefit of
and sports spotless build keys and three additional fessional reception devices – which means you can ei-
Simultaneously, the trans- The fact that the NDS3975 sional transmissions (feeds, adding encryption to sports
quality that seems to sug- buttons for Enter, Menu and for head-ends. Contrary to ther choose DVB-S2, DVB-C
port stream of the tuner is does not only come with etc.) without having to deal feeds without incurring ad-
gest ‘I’m made to last!’. In Lock we discovered a small conventional consumer re- or DVB-T – there is an ASI
available via two additional two CI slots for conditional with all the obligations im- ditional costs. The transmit-
addition, a look at the rear screen. Could it be true? ceivers, IRDs are designed input as well as an option
ASI outputs, and the inte- access modules but also posed by proprietary solu- ting and the receiving end
panel puts us in for another Does this new IRD come for permanent use. This to receive a transponder
surprise, as there are more with a small monitor right on means, the ultimate bench- stream via a dedicated net-
connection options available the front that can show live mark is not convenience and work interface. ■ Illustration 2: Example
than most of us would think TV with its 38mm diagonal? fast zapping, but receiving a This means that it is pos- for using the NDS3975 in
a network
possible: channel or transponder for sible to receive a satellite
- power input There was only one way any length of time up to sev- transponder through the
- 3 x RJ-45 (IPTV input – to find out – quickly connect eral years and making that built-in DVB-S2 tuner and
„FE“, IPTV output – „GE“, and set up the device! Yes, signal available for further at the same time feed in a
as an option and not avail- this small monitor has a sur- processing and distribution. second transponder from
able on our test unit, NMS – prisingly high resolution and The major specifications another IRD via ASI.
maintenance) can easily replace an exter- for IRDs are: Still looking for some ic-
- high reliability ing on your cake? There you
- 19-inch rack format are: A third transponder can
- high usability be integrated via IP at the
- excellent reception quality very same time.
01-02/2013
Dexing NDS3975
Most powerful and versatile
IRD ever - its built-in monitor
is a unique plus.

www.TELE-audiovision.com/13/01/dexing


merely have to agree on a accessed when status dis-
key for reliable and cost- play is active.
efficient encryption. Dexing Once the configuration
definitely deserves special menu is called up you can
praise for implementing this use the Up/Down buttons to
encryption method in its navigate between different
NDS3975 as well. menus.
To make sure we can look The menu option that is
at all features and functions shown in the first line can
of the NDS3975 we set up a be activated with the Enter
small head-end in our test button, and the Menu but-
center. A second IRD with ton brings you up one menu
ASI output was added to level. A highlighted option
provide a complete trans- in a sub-menu can be acti-
port stream from ASTRA vated with the Enter button
19.2° East, and with the help and edited with the four ar-
of the TSReader software row buttons. This way edit-
(see test report in TELE- ing frequencies or symbol
audiovision 09-10/2012) we rates becomes a surprisingly
also provided the locally straightforward affair.
available DVB-T transpond- When you’re done editing
er. The NDS3975 itself was a touch of the Menu button
set up to receive a second confirms all parameters. Il-
transponder of the ASTRA lustration 3 shows the menu
19.2° East satellite. structure of the NDS3975.
We then verified all results Before we went about
using a professional meter configuring the NDS3975 we
with ASI input, while at the first defined which channels
same time distributing the should be included in the fi-
transport stream generated nal transport stream:
by the NDS3975 to our PC - ARD (from the tuner of
using UDP Unicast. The Dek- the NDS3975)
tec DTS-215 Gold (see test - ZDF (from the ASI input)
report in TELE-audiovision - RTP-1 (from the IP input)
12-02/2012) was installed - RTP-2 (from the IP input)
in our PC to re-modulate the - SIC (from the IP input)
signal into the DVB-C and - TVI (from the IP input)
DVB-T standards. Once that This channel list is based
was achieved the final signal on three different transport
could easily be tested on any streams, which should be
standard DVB-C or DVB-T fed to the NDS3975 using
receiver. the following scenario:
When you go about setting 1) Tuner: Using the built-in
up the NDS3975 you can fol- DVB-S2 tuner transponder
low two different routes: 19 from ASTRA 19.2° East
You may choose to do all (11494 H 22000-2/3 8PSK)
the configuration right on is received. This transpond-
the device itself (frontend er carries the German public
operation) thanks to the broadcaster ‘Das Erste’ in
LCD screen and the seven high definition, among other
control buttons, or you can channels.
download the Network Man- 2) ASI: Using the ASI input
agement Software (NMS transponder 77 from ASTRA
operation) from the Dexing 19.2° East (11954 H 27500-
website at www.dsdvb.com 3/4 QPSK) is fed to the IRD.
free of charge. It is entirely on purpose that
We embarked on route 1 we set up the second trans-
first, which is self-explana- port stream with a standard
tory once you have grasped definition transponder, so
the meanings and functions that we could check out how
of the Enter, Menu and Lock capable the multiplexer of
buttons. Lock, for instance, the NDS3975 is.
switches between status 3) IP: The IP input should
display and menu, so one receive its signal from a PC
could argue that Lock in this with TSReader Pro. To that
context means that the con- end, we installed a BDA com-
■ Illustration 3: Menu structure of the NDS3975 figuration menu cannot be patible DVB-T USB receiver

84 TELE-audiovision International — The World‘s Largest Digital TV Trade Magazine — 01-02/2013 — www.TELE-audiovision.com

1 2

3 5

4

1. Everything is hunky-dory, on our PC and streamed the our improvised cable head- input: All we had to do is lead all input signals to the
with the LCD screen showing the entire 754 MHz transponder end. initiate a search in the Prog re-multiplexer first.
current data rate.
of the local DVB-T in Portu- These are the steps we Parse sub-menu. We opted for the latter,
2. What a fascinating feature: The
built in mini-screen can present gal to the NDS3975 via UDP. took to set up the NDS3975 3) Configuration of the since our end result should
the currently selected channel This stream is comprised of for our test scenario: IP input: By default, the be a single transport stream
with high resolution. This way
you won’t need an external five channels with MPEG-4 1) Configuration of the NDS3975 comes with some with six channels.
monitor. Pure genius! and AAC compression. built-in tuner: To start with, useful parameters for IP in- We also configured the
3. The small screen has exactly These three transport we had to change the tuner’s terfaces, which meant we output bitrate. We did not
the same content as our external streams should be muxed LOF to 9750, since by default did not change the multi- edit the network IDs at
monitor, which we connected via
DVI and a corresponding adapter. into a newly created trans- it is set up for the C band. cast address 224.2.2 at port this stage, even though the
The NDS3975 even delivers audio port stream carrying the Next, we entered the fre- 1001. Once again, we then NDS3975 gives users that
in addition to video. quency (11494 MHz), sym- proceeded with the search possibility too. What we did
channels listed above. In
4. The transport stream
generated by the NDS3975 was
addition, the new stream bol rate (22000) and LNB in the Prog Parse sub-menu. change, however, was the
passed through to our meter that should be given out both via voltage (18V for horizontal). 4) We then had to turn IP address for the IP stream
has an ASI input. ASI and IP. The IP stream Once the Tuner Lock sta- to the output side. The output. By default, a multi-
5. Almost like a professional will be forwarded to a Dek- tus LED indicated a locked NDS3975 can be set to cast IP address was entered
studio: The NDS3975 (left,
under the monitor), IRD, DVB-C tec DTU-215 Gold, which will signal we went to the Prog pass through the transport here as well, but we thought
receiver, DVB-T receiver, PC with take care of modulating the Parse sub-menu and started stream from one of the in- it would be wise to stream
TSReader and Dectek DTU-215 IP stream into a DVB-C sig- a channel search. puts (tuner, ASI or IP) di- directly to one of our test
Gold installed.
nal which will then be led to 2) Configuration of the ASI rectly to the IP output, or to PCs via Unicast. This way


4

happy about that, since it is could then be received and
1 labelled Alarm. processed with any stand-
In step 4 just above we ard DVB-C receiver. Even all
had activated Multiplex, additional features and ser-
which meant we needed to vices such as teletext were
define which channels from available without a glitch.
the three inputs should be The conclusion we drew
taken over. from building our own lit-
As mentioned in the begin-
ning, the NDS3975 can also
be set up with great ease 5
using the Network Manage-
ment Software (NMS) right
on the PC. For the Multiplex
setup we opted for that very
6
convenient option.
The software is not de-
signed specifically for the
NDS3975 but works with all
Dexing products. This way
a head-end equipped with
different Dexing products
2 can be set up and controlled
with a single software solu-
tion.
The tree structure of the
software allows defining

3

NDS3975 our meter with tle head-end station was
ASI input detected the in- that this was not only an
coming transport stream. interesting and worthwhile
4. Channels received by the tuner can be descrambled with one of
What’s more, all channels undertaking, but can also
the two plugged in CAMs. It’s interesting to note that each channel of the stream could be re- easily provide residential
can be individually paired with one of the two CAMs. ceived nice and clear. accommodation, hotels or
5. The ‘Mux’ tab takes care of re-multiplexer configuration, which Next, we turned to the hospitals with complete TV
could not be easier: on the left side you select a source channel
and by clicking on the arrow button pointing to the right it is added Dectek DTU-215 Gold. First, bouquets via DVB-C/T or
to the target stream. Selecting a channel on the right side and we set up the MuxXpert IPTV.
using the arrow button pointing to the left, the channel is removed software – which is avail- As always, we put the in-
from the target stream.
able as an option – to make tegrated tuner itself to a
1. All Dexing devices are supported by the 6. The NDS3975 is a professional device, which is why it comes
NetworkManagement Software, allowing entire head-end with a fully implemented BISS decoder inside. Simply enter the sure the IP stream from the thorough test as well. The
stations to be managed with a single software solution. current BISS key, select the BISS version and you’re done. NDS3975 is handed over di- results show that it is able
2. The “General Parameters” tab shows all main rectly to the DTU-215, which to lock a signal even if the
configurations and here the video signal can be adjusted as dress of the NDS3975 (IP user-friendly solution and in turn would take care of antenna is on the small
required. 192.168.1.210 in our case) for large installations, in modulating the stream into side and delivers a rather
3. To be seen on the left: Tree structure with TELE- and confirming it all param- particular, you can identify
audiovision group and Dexing NDS3975. To the right: a DVB-C signal. sketchy input signal.
Parameters Tab showing Tuner Parameters of the integrated eters of the receiver can be potential problems at a sin- At this point you should What’s more, we also tried
tuner. Our IRD is equipped with a DVB-S2 tuner. accessed, read and changed gle glance. take care of the input band- to provoke errors feeding
we could eliminate poten- the NDS3975 as composite tion, since the pre-defined groups which can be used to as required. This is way fast- On the left side of the width, which must not ex- the IP input with a faulty
tial network problems in our video, component video and IP address of the NDS3975 control several head-ends at er and much more efficient MUX tab all received chan- ceed the maximum band- transport stream – but to no
test center. HDMI. In addition, this was (192.168.1.210) worked bril- the same time, for example. than making all adjustments nels are listed according to width for the selected avail! Turning the transport
5) In the Decoder Settings also the channel that would liantly for our test network. Each group can then be set directly on the box. input, while the software modulation. At the begin- stream via ASI and IP off
menu you can freely select be displayed on the mini As soon as a single change up to manage any number of Each device is shown in lists channels that should ning we simply could not re- and on again did not bother
the video and audio formats, screen on the front panel. of the NDS3975 parameters Dexing devices. the tree structure with a vir- be packaged into the out- sist the temptation of add- the NDS3975 either, it per-
with a huge array of options Any channel can be se- is confirmed the IRD be- The one thing you need tual LED in front of its name. put stream on the right side. ing too many channels to a formed brilliantly whenever
available. lected for output, no matter comes active. You can see to make sure is to select This LED lights up in green This way it does not take single transponder, but after a stream was fed to one of
We restricted ourselves whether it’s in the trans- this with all five LEDs light- the correct device from the whenever a connection be- rocket science to set up a we had reduced that number its inputs.
to perform a tuner search port stream of the tuner or ing up: Power, Tuner Lock, drop-down list, so that the tween software and receiver new Mux. to six everything was alright All that happens when the
and then selected ARD HD. comes for the ASI or IP in- ASI Lock, IP Lock and De- corresponding tabs show is established, and if no con- In fact, you don’t even and worked flawlessly. ASI cable is disconnected,
This meant that ARD HD puts. coder OK. the menu options for that nection is possible this is in- have to consult a manual. The frequency that was or the feeding receiver is
would be available from the 6) We did not change Only one LED remained particular device. dicated with a red light. We Once the final settings have created with MuxXpert switched off, for example,
video and audio outputs of the network configura- dark, and we were quite After entering the IP ad- believe this is an extremely been transferred to the (447MHz, 64QAM, SR 6875) is that the status LED ceas-


es to light up. No troubles then again, we found out product. The IRD NDS3975 these days many people are
caused, no tricks required right away how to use the is top-notch product in a worried their purchase may
– that’s what we like about IRD and hardly ever noticed league of its own. Not only turn into a waste of money
this IRD. that the manual was miss- is it a professional receiver, as soon as some framework
There’s one more thing ing. This in itself speaks but an integrated device conditions change. Owners
that deserves special praise: volumes about the user con- combining tuner, ASI and of the MNDS3975 need not
Whenever video cannot be cept of the NDS3975, which IP into an excellent pack- have such worries, since all
put out due to faulty recep- is self-explanatory like only age complete with re-mul- their product will require is
tion, for instance, there is few other products we had tiplexer. Add to that a high- an updated configuration
only a short alert message tested before. And in case performance demodulator to stay ahead of the pack.
indicating the signal failure. you didn’t know: The iP- capable of giving out video Conventional tuners, on the
After that, the screen simply hone doesn’t come with a as HDMI, component video other hand, more often than
remains dark. We believe manual either. We had a to- or composite video and you not must be replaced by a
this is a very smart solution, tal of three weeks to check end up with a state-of-the- new model.
since end users do not need out every nook and cranny art offering. With the option In our final verdict we
to know the precise cause of of the NDS3975 while it was of re-multiplexing the trans- can whole-heartedly rec-
a problem. After all, would running without interrup- port streams right within the ommend the IRD NDS3975
you want “Bad reception – tion. Were we faced with system it can do away with without any restrictions.
please tune your dish” to any technical problems or or at least reduce the num- Never before has a similarly
pop up on the TV sets of your malfunctions? ber of required standalone robust, versatile and fasci-
cable TV customers? A blank Far from it! This is all the multiplexers, depending on nating professional receiver
screen is much less embar- more impressive, since our the field of application. made its way to one of our
rassing, don’t you think? tests place the highest of de- Thanks to its wide range test centers. The icing on
So does all this mean mands on all devices and we of features and functions the the cake is provided by the
we could not even find the usually don’t give up until we NDS3975 is fit for the future mini screen on the front
slightest fault with this prod- detect a flaw. The NDS3975 as it can always be adapted panel, which had us wonder
uct? Well, the receiver we got the better of us, which to new or enhanced require- why something useful like
were sent for testing came means we can only congrat- ments. When they go out to this has not been available
without a user manual. But ulate Dexing on a top-quality buy a professional receiver before.

90 TELE-audiovision International — The World‘s Largest Digital TV Trade Magazine — 01-02/2013 — www.TELE-audiovision.com

1 9 12
Expert Opinion
Very robust and sensitive Tuner
Multiple reception (Tuner, ASI and IP)
Integrated Re-Multiplexer
+ Many output options (ASI, IP, HDMI, Compo-
nent, Composite)
2 10 13 Simultaneous tuner pass-through to ASI
Vitor Martins Augusto

– None
TELE-audiovision
Test Center
Portugal

TECHNICAL
DATA
3 11 14 Manufacturer Dexin Digital Technology Co. Ltd.
Email sunyu@dsdvb.com
Website www.dsdvb.com/english
Model NDS3975
Function Professional Integrated Receiver Decorder
Input
4 1. Main menu: All menu items are numbered, which greatly facilitates 15
all documentation and remote support. Based on the menu number Tuner Input x1 QPSK,QPSK ( / / optional)
it is easy to communicate which parameter has to be adjusted and in ASI Input x1 Maximum transmitting rate 90Mbps
what way.
2. We started out by accessing the Input menu and from there going IP x1 Maximum transmitting rate 80Mbps
to Tuner Configuration. Output
3. The correct frequency has to be entered in menu item 1.1.2 for a Video Output SDI: 1080i@25 ,29.94fps,720p @ 50 59.94fps,
satellite transponder to be received properly.
576i@25 fps480i@29.94 fps
5 4. Don’t forget to make sure the right LOF is given in menu item 1.1.3.
5. Now the symbol rate has to be entered in item 1.1.4. ENERGY YPbPr:1080i@ 25 ,29.94fps,720p @ 50 59.94fps

6. This is followed by menu item 1.1.5, which takes care of the correct DIAGRAM CVBS: 576i@25 fps, 480i@29.94 fps
polarisation – V or H. Audio Output Stereo unbalanced audio BNC interface
7. The only thing that’s still missing is the high or low band, i.e. 0/22 Apparent Power
Stereo balanced audio XLR interface
KHz. You can set this in menu item 1.1.6.
8. Time for a signal scan (menu item 1.1.1 – Prog Parse), which delivers Digital audio digital audio

6 all channels of the transponder. Each channel can be selected ASI Output 1#x2 One pair
individually.
Active Power ASI Output 2#x2 One pair, optional
9. Menu items 1.2 and 1.3 must be accessed to set up the ASI and IP
input. IP Output x1 FE Port: MPTS&10 SPTS,
10. German channel ZDF was selected in this case. This channel was maximum transmitting rate 90Mbps
fed through the ASI input. CAM
11. As far as the IP input is concerned, the correct IP address has
to be entered in sub-menu 1.3.2 first. In addition, the port has to be Descrambling procession Supporting European DVB-CSA
Mode Apparent Active Factor
7 entered as well (1.3.3). Active, no built-in monitort 45 W 28 W 0.62 Smart Card interface: ISO7816
12. Right after that, all channels of the IP stream can be listed and Active, with built-in monitort 46 W 28.5 W 0.61
Interface Card separation: PCMCIA
selected in menu item 1.3.1.
13. Numerous adjustment options for video and audio output are Graphical LCD Status and configuration
available in the decoder menu. Video Monitor Live TV
14. In menu item 3.1.1, for example, the output resolution can be set Buttons 7x Control buttons
as required.
15. Once the desired input is selected in menu 3.5 and a channel In the first ten minutes the NDS3975 was operated with three input Power Supply AC 110V-240V
8 search has been performed in menu 3.4 it is possible to select the signals and active re-multiplexing. Temperature Range 0-450C (Operation)
desired channel in menu 3.3. This channel is then available via HDMI, During the last five minutes a slightly increased power
component video out and composite video out. For monitoring consumption can be observed, which is caused by the switched on Dimensions 482mm×360mm×44mm 3.2Kg
purposes this channel can also be watched on the built-in mini- mini-screen of the front panel.
screen.


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