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DIPOL Weekly Review - TV and SAT TV, CCTV, WLAN
No. 19/2012 (May 7, 2012)
The third way of CCTV. IFSEC International 2012, security trade fair in Birmingham, approaches rapidly (May 14-17). The world class event shows new trends in technologies that protect people and property. The experts expect that this year's meeting will answer the question about the further development of technology based on high-definition serial digital interface (HD SDI), called the "third way" in CCTV.

Until recently, it seemed that the market has been divided into two parts, analog and IP video monitoring. Analog cameras are particularly effective in small-scale, local monitoring systems. In the case of large or scattered installations, especially with requirements for megapixel image resolutions and image analysis, the position of IP cameras, which provide compressed digital video streams transmitted over computer networks, has clearly strengthened. IP cameras can offer multi-megapixel images that may be transmitted over unlimited distances, whereas analog cameras are simple to install and cheaper.
The "Third way" i.e. HD SDI (another name is HDcctv) is intended to link the both technologies, with higher resolution of digital systems and the simplicity of analog ones. HD SDI has already been used since the '80s in TV installations requiring the highest quality images (such as high-definition broadcast television studios).
The installation of HD SDI (SMPTE 292M) cameras is identical as in the case of analog devices. The signals are transmitted without compression via coaxial cables, but in digital form. The maximum image resolution is 1080i (1920x1080 pixels in interlaced scan mode).
The video compression is performed in a dedicated digital video recorder. The maximum transmission distance with the use of coaxial cables is 100 m, but it can be extended using SDI repeaters, or fiber optic transmission means.
The advantages of HD SDI over IP CCTV solutions include the lack of delays, no need for IP addressing on the LAN, no loss of signal quality in the camera (the output signal is not compressed). Another strong point is the full compatibility of HD SDI cameras and DVRs coming from various manufacturers. In contrast to IP technology, the manufacturers implement solutions based on well-defined standard that is developed, managed, and promulgated by the HDcctv Alliance.

The only factor limiting the development of this technology is the high price of the equipment. It is almost certain that its decline, at least to the price level of IP CCTV devices, will dramatically increase the sales numbers.
Connecting HDD from DVR to a PC. The software contained in the free application package for Signal DVRs enables the user to access the surveillance data saved on a hard drive used in any of the DVRs directly on a computer running a Windows OS. After connecting the HDD removed from a Signal DVR to a PC (e.g. using a drive bay), the Super Play utility allows for playing back the recorded material in an synchronized manner. The relevant files are presented on the timeline. The HDD from Signal DVRs is handled by the Windows OS without a need for additional drivers or plugins. The SuperPlay application can also play back files exported by the DVRs in *.dvr format.
The view of 8-ch SIGNAL M78308 and 16-ch SIGNAL M78316 DVRs
Multiswitch system with bus topology for 60 dual outlets (for PVRs). The contract involved the design and installation of SMATV system for reception and distribution of satellite signals from Astra and Hotbird, and digital terrestrial broadcasts (DVB-T) in a building with 60 apartments. The building has three staircases, each for 20 apartments that should be equipped with FM/TV/SAT-TV outlets with two satellite sockets.

The draft of the building to be equipped with the SMATV system
Due to the layout of the building, the installation company has chosen bus topology with subscriber lines connected to the junction box located in the basement of each staircase.
Diagram of the multiswitch system in the building with 3 staircases and 60 apartments,
performed with the use of SatNet program (click on to enlarge)
Because the investor's objective was to use R694140 outlets with additional socket for a twin tuner PVR receiver, in each staircase there are 40 subscriber lines run from the multiswitches. The signals from the 110-centimeter A9658 dish are transmitted via TRISET-113 E1015 cable. In the basement of the middle staircase there is a set of TERRA at420 R82510 amplifiers that equalize the levels of DVB-T multiplexes. These signals and the satellite broadcasts are amplified by the amplifier for 9-input multiswitches, Terra SA-901 R70901. The bus is split into three subnetworks with the use of the SSQ-908 R70529 TV/SAT splitter - two of the splitter outputs are connected with multiswitches for the center staircase, another two send the signals via cable bus to the side staircases. The side staircases employ SS-904 R70523 splitters and MSV-916 R70866, MSV-924 R70874 multiswitches.
With these guidelines, the final design has been completed using Terra SatNet software. The program automatically calculates settings for the amplifiers and multiswitches, as well as the total current consumption of all installation components, including LNB. Because the total current is only slightly higher than 1 A, the multiswitches and LNB can be remotely powered via signal lines from the SA-901 amplifier.

More information on solutions based on bus topology can be found in the article Adaptation of SMATV / MATV / shared antenna systems for reception of DVB-T broadcasts.
How does an optical splitter work? ULTIMODE optical splitters can divide the optical power transmitted in an optical fiber into 4/8/16/32 equivalent parts. An optical splitter is a passive element of the network, so every branch gets all the packets sent in the trunk from the optical line terminal (OLT) at the service provider's facility. It is the role of the optical network terminals (ONTs) of the end users to filter the information.
Optical splitters are mainly used in CATV and FTTH passive optical networks (PONs). The diagram below shows the functioning of such a splitter.
Optical splitter is a passive component of the network,
so all the packages from the trunk are sent to the branches
ULTIMODE splitters are characterized by stable performance over the entire working band (1260-1650 nm). Each of the single-mode optical cables coming out of the casing is 1.5 m long and terminated with SC/UPC connector. The splitters are manufactured in planar technology, (Planar Wave Circuit - PLC). The advantages of planar technology are precise, balanced optical power splitting, very low attenuation, and good temperature stability. High split ratios are possible, as well.
Digital Slow Shutter (DSS, Sense-up). It is a difficult task to get high quality images at night, with no additional lighting. Sensitivity of a CCTV camera can be significantly enhanced by slow shutter speed. Cameras with DSS/Sense-Up function can be used in very low light, which is especially useful at night.
Typically, CCTV cameras are equipped with Auto Electronic Shutter control (AES), usually within the range of 1/50...1/100000 s. The shutter speed is controlled by the signal processor in order to achieve correct exposure.
Cameras with DSS function can further increase the exposure time (usually from 2 to 256 times). After proper adjustment, they may sometimes provide even color images in situations where other cameras (or the same cameras in standard mode) generate noise only. However, the user of a DSS camera should test the feature in advance to avoid disappointment. Excessive factors can cause that the images look blurry and smudgy.
We offer Sunell cameras based on Effio-S ( M11220) and Effio-P ( M11225) DSPs with DSS function.
The effect of Sense-Up function (on the right)
NUUO NVRs - FTP backup. If the amount of local disk space is insufficient or there is a need to protect the system against data loss, the video data from NUUO K4108, K4316, or K4204 DVRs can be copied to a remote or local FTP server. The NVR can automatically copy data from selected cameras within predetermined time intervals, so the administrator can decide which files will be copied.
Auto Backup Management window
Additionally, by choosing the time of the day for "Auto Backup" operation, the operator can use the periods of low network activity, usually late at night or early in the morning. FTP default port number is 21 and may be freely changed. In the event of loss of connection to the FTP server or failure to complete the copy, the NVR can notify the operator via email or by displaying onscreen message.
WiFi network based on N Lite TP-LINK devices. Wireless devices that support n standard have become the most popular category of home networking equipment. Very popular are N Lite TP-Link devices supporting wireless transmission speeds up to 150 Mbps (the maximum transmission speed of devices with a single path/antenna).
Below there is a diagram of a simple home network where the Internet is provided via ADSL line and distributed through wired and wireless network in the home, using TL-WR740N N3252 Access Point/ Router.
Wireless USB Adapter: TP-Link TL-WN721N (802.11n, 150Mb/s)Access Point: TP-Link TL-WR740N (w. router, 4p-switch, 150Mb/s 802.11n) Wireless USB Adapter: TP-Link TL-WN722N (802.11n, 150Mb/s)ADSL Annex A Router: TP-Link TD-8816PCI Network Interface Card: TP-Link TF-3239DL 10/100Mbps
A home network based on TP-LINK devices
Mobile devices are usually connected to the network wirelessly via Wi-Fi cards (built-in, or USB adapters), desktop computers can be connected to the ports of the 4-port switch (via NIC cards), or optionally can also be equipped with wireless adapters.
New products offered by DIPOL
2MP IP Dome Camera: Sunell SN-IPV54/12UDR (Aptina 1080p CMOS, ONVIF, OUTDOOR vandal-proof)
Insulation Stripper ABI 212 (for RG59, RG6, RG7, RG11, and phone cables)
Outdoor 2MP IP Dome Camera
Aptina Sunell SN-IPV54/12UDR
5.0 MP, ICR
Insulation Stripper ABI 212
RG59, RG6, RG7, RG11,
flat telephone cables

Worth reading:
How to correctly measure DVB-T signals? When installing a DVB-T receiver, many users adjust the antenna position watching the signal "strength" (and/or "quality") line(s) on the OSD page. It happens that users of different models of receivers exchange information on the signal level in a given area, based on such indications of their receivers. And still worse, many installers perform "measurements" of DVB-T signals in antenna systems based on the embedded indicators...
The indications of the received signal in the same antenna outlet shown by three models of DVB-T receivers.
The differences in indications of the built-in signal strength and quality "meters" can lead to wrong conclusions
during adjustment of antenna systems.
It's time for fiber optic backbones. A telecommunication and Internet service provider has been preparing the network for a newly built housing development consisting of three apartment houses, each with 20 apartments. The investor required to deploy optical links to the buildings in order to offer the future residents advanced triple play services (broadband Internet, TV, and VoIP), with the use of GPON technology...
Diagram of the fiber optic solution
The first 3G mobile router from TP-LINK. The TP-LINK TL-MR3020 N2959 device is a 3G travel router with a compact size of 74x67x22 mm, which provides access to the Internet for Wi-Fi devices in any location covered by a 3G network. Thanks to the built-in AP, the device allows the user to create a wireless local network. A computer is added just by pressing the push button (WPS). The access to a 3G network is obtained by connecting an external 3G modem...
An example application of the TP-LINK TL-MR3020 N2959 device -
four devices can be simultaneously connected to the Internet via a 3G network
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