CW-4871, -72, -73, -74, -75, -76, -78 DEMODULATOR QUAD CW-4871, -72, -73, -74, -75, -76, -78 DEMODULATOR QUAD
The software can be downloaded from
www.cableworld.hu and be used free of charge.
After having installed and run the proper one from the
SW_487x software, set in the CW-Net Connection
panel the IP address of the device you want to ad-
dress; in this example the 102.
The computer can only address the device if its IP
address is set correctly. In case of correctly set IP
address on clicking the Query button the name and
type of the device will be displayed.
3. HARDWARE AND SOFTWARE SUPPORT
In CableWorld’s system, managing the devices is
based on the CW-Net and it needs beyond the de-
vices a PC only. For controlling the CW-Net, the user
can use his own PC, but if demanded the PC can
also be delivered with the system: the CW-4891 Da-
taBoss 19” rack mounted PC or the CW-4892
DataChief notebook PC.
Data streams of low data rate, e.g. elementary
streams can be processed even with computers of
lower performance.
In order to introduce and spread its unique system,
CableWorld Ltd. supports its user by issuing many
descriptions, guidelines and pieces of software, whose
number will even increase in the future; They can be
freely downloaded from www.cableworld.hu. In the first
phase of the market introduction following materials are
at our users’ disposal:
CW_Net_a.pdf
Summary of establishing the CW-Net, support to
design the first pieces of own software.
CW_Net2a.pdf
Description of the use of CW-Net, block diagram of
the structure of the CableWorld system.
SW-4800 CW-Net Principal
Simple software for establishing the CW-Net, setting
the IP addresses, testing the readiness for operation
and troubleshooting.
SW-4841 ASI to IP & IP to ASI Converter
Control Software
Common managing software for both converter
types, and also for use with other devices. The soft-
ware permits using the whole IP address range and
provides supports for correcting the errors made at
IP address setting.
SW-4890 Computer Performance Tester
Simple software for testing the set-up and the capa-
bilities of the computer connected to the CW-Net.
SW-4811 TS Analyzer
Transport stream analyzer software for inspecting the
structure and content of the given TS, for developing
and training purposes and for checking the operation
of devices.
Using_CW_Net.pdf
Guidelines for applying the CW-Net, support to make
the first steps, hints for elaborating the applications.
4. PUTTING THE DEVICES IN OPERATION
Connect the device to the specified power voltage
and switch on the mains switch. After a few seconds
the device is ready to operate.
When using the own computer for making the
settings, install SW-4800 CW-Net Principal and the
appropriate from the SW-487x, which are available
for download in the ‘Software’ page at
www.cableworld.hu. The programs install in the
C:\Program Files\CableWorld folder and create an
icon on the desktop. All pieces of software have been
designed for the Windows XP Professional operation
system. The simpler pieces of software can run in
other environment, too but there we have not tested
them.
After having installed the software, set the IP ad-
dress of the computer to the fixed 10.123.13.201
value, or to any other value within the 10.123.13.x
range (x = 0…255).
For the CW-4891 DataBoss and the CW-4892
DataChief computers these procedures have already
been performed.
4.1 Input signals
The QAM- and OFDM demodulators need input
signals in the 47 … 860 MHz frequency band with a
level of 40 … 85 dBµV. Input signals with too low or
too high level result in the increase of the bit error
rate.
Between the RF IN and the (bridged) RF OUT
connectors the QAM and OFDM demodulator mod-
ules are equipped with an amplifier of 3 … 6 dB gain.
When bridging the inputs of multiple modules, be
careful not to overdrive the input amplifiers of the
tuners (when bridging 4 modules, the signal level at
the input of the last tuner will already be by 9 … 18
dB higher).
When bridging the inputs of OFDM demodulators,
sever problems can be caused if the signal coming
from the antenna contains anywhere in the 47 … 860
MHz band analogue TV signals or other signals at a
level by 20 … 30 dB higher than the signal to be re-
ceived. Such high-level signals can lead to overdrive
even in the amplifier between the RF IN and RF OUT
of the first module. The disturbing products arisen by
intermodulation can appear even in the reception
band, and block the operation of the demodulator. In
such case the antenna signals should be distributed
by directional coupler type distributors.
The QPSK demodulator is equipped between the
RF input and RF output with an amplifier of 0 … 1
dB-gain. Here, bridging will not cause overdriving
unless the level of the input signal is too high.
With QPSK demodulators, by making use of the
bridging possibility, usually no SAT IF distributor is
needed.
From the double ASI outputs of the QPSK-, QAM-
and OFDM Demodulators one can be used e.g. for
the main stream, the other for connecting a Transport
Stream Analyzer, thus using ASI distributors can be
spared.
4.2. Ethernet converter
Beyond the ASI transport stream output signals of
the 4 demodulator or ASI modules, one of them can
be selected on the GUI of the managing software to
lead it to the Ethernet board and output it in form of
UDP/IP packets.
This output signal is the selected transport stream
implanted in UDP/IP packets. The structure of the
packets is described in the CW_Net_a.pdf file.
The converter implants a continuity counter signal
in the packets, which permits the steady monitoring
of the error-free transmission in the Ethernet network.
Building the network and setting-up the computer are
described in details in the Using CW-Net.pdf file.
Since the computer is not capable of accurate
timing, the Ethernet converter implants in the packets
also the signals of a 25 MHz quartz oscillator. The
details of this PCR-like (Program Clock Reference)
implantation are described in CW_Net_a.pdf, too.
The connection between the device and the com-
puter can be established in the simplest case by
connecting the RJ45 output of the device with the
network card of the computer through a crossover
cable. When connecting multiple devices, they
should be connected through an Ethernet switch, but
in this case with straight cables. The basics of net-
works building are discussed in the CW-NET_a.pdf,
putting in operation and configuring the computer in
Using_CW_Net_a.pdf.
The detailed instructions for using the devices’
managing software are to be found in the Help
menus of the software and also in pdf format in the
’Software’ page of our web site.
5. TECHNICAL DATA
The technical data of the CableWorld products
are published in their data sheets, which are avail-
able at the web site www.cableworld.hu.
Additional technical information:
5.1. All ASI inputs and outputs are insulated from the
frame by transformers, which assure 2000 V separa-
tion. This design is very advantageous in applica-
tions, where to be prevented is the formation of earth
currents due to transmitting the ASI signal over larger
distances between different rooms or laboratories.
From the point of view of electromagnetic radia-
tions and protection against disturbances, it is advan-
tageous if the outer shielding of the ASI connecting
cable is earthed at a proper point. This point has to
be found individually in each application.
If the user wants to earth the outer shielding of the
coaxial cable just at the device’s output or input, the
product can optionally be delivered with metallic ASI
socket(s) instead of insulated socket(s). In individual
cases the user can easily make the earth connection
with a short jumper.
Troubleshooting for the most frequent problems at
building the CW-Net, configuring the computer, put-
ting the devices into operation and others are given
in the Using_CW_Net_a.pdf file.
We appreciate receiving all remarks, experiences,
measuring results made with our products and we
pay respect to them at our further developments.
Beyond serial products, CableWorld is ready to
deliver products for special demands and implement
individual ideas.
Those customers, who are going to integrate our
products into their systems and undertake writing
own software for operating these products or for solv-
ing their individual task, can reckon with our utmost
support. Your questions, ideas and suggestions are
In all four versions of the quad series (QPSK-, QAM-
and OFDM demodulator quad and ASI Descrambler)
each of the four independent channels is equipped
with an own CI circuitry. Handling the CI interface
and configuring the CAM modules is made with the
SW-4872 CAM Analyzer and Programmer software,
separately from the settings of the high frequency
demodulator parameters.
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