No. 43/2024 (December 23, 2024)

We wish you a warm, joyful and family Christmas, and a happy New Year!
DIPOL team
DIPOL team
Soldiers in China can become invisible – groundbreaking camouflage.
The Chinese army may soon have access to a revolutionary technology that will allow soldiers and military equipment to blend into their surroundings like chameleons. Researchers from the China University of Electronic Science and Technology are working on the innovative solution.Wang Dongsheng's team is developing a material that could significantly affect future military conflicts and provide users with a previously unattainable advantage. The technology, dubbed SAP (Self-Adaptive Photochromism), could make people and equipment nearly invisible.
The color-changing material reacts to its surroundings, changing color in a manner reminiscent of a chameleon's abilities. Unlike existing active camouflage technologies, which often use complex electronic components, SAP is simple to use and much cheaper. The key to SAP's performance lies in its molecular structure, which rearranges itself when exposed to light, leading to a color change. In the dark, the material remains black, but in the light it spontaneously adjusts its color to match its surroundings.

Credits: Ellie Burgin/ Pixbay
Camouflage is a common and important feature of animals, enabling them to hide from predators or capture prey. Of particular interest is active camouflage, which allows organisms to actively change their appearance to match their surroundings. This makes them difficult to spot in different environments. However, current active camouflage systems have serious limitations. They rely on complex electronic devices, leading to high costs, difficult operation and complex design. Developing active camouflage technology that takes advantage of the natural properties of color-changing materials still remains a major challenge.
Wang Dongsheng and his team have already tested SAP in two experiments. In the first, the material adjusted its color in various test environments, such as colored boxes. In the second, its response was tested under natural conditions. The results showed that the camouflage activated within 30 to 80 seconds. The researchers announced further work to reduce this time.
The team combined SAP with polycaprolactone (PCL) to create flexible films that can be applied to a variety of surfaces. As a result, the technology can be used not only on uniforms, but also on military equipment. What is more, SAP works in a wide temperature range, from -20°C to +70°C, making it versatile in a variety of combat conditions.
Smart Horizion COMBO and Smart City COMBO – quick, tool-free installation.
SMART HORIZON COMBO A2270 and SMART CITY COMBO A2050 TV antennas are directional antennas, capable of receiving DVB-T2 digital terrestrial TV in the VHF and UHF bands. They are made of aluminum with galvanized steel structural elements, so they have increased resistance to weather conditions. Black ABS plastic elements ensure stability and aesthetics. Reinforced bar of the antenna (main section) guarantees high mechanical resistance (to wind, birds). Due to the high gain in passive mode, the SMART HORIZON A2270 antenna is designed for use in SMATV systems and at greater distances from the transmitter in individual systems, while the compact dimensions of the SMART SMART CITY A2050 antenna allow installation on a balcony or in a window. The antenna is easy and fast to install, and this requires no tools.Thanks to its thoughtful design, assembling the SMART HORIZON COMBO A2270 antenna requires no tools and takes no more than 2 minutes. Check out our video!
How to limit "live" video viewing privileges in Sunell DVRs?
In surveillance systems, you can create multiple user accounts and assign them various privileges. Among other things, you can allow certain users to view only selected cameras. What if the user logs out? Sunell DVRs allow you to specify which cameras can be viewed without logging in. The function is useful when automatic logout after a certain period of time is enabled, and surveillance of cameras is to be continuous. Similarly, in case the DVR restarts due to power failure. Another startup of the DVR, despite the lack of login, can start viewing from the cameras.This function can be configured via the local interface or web browser under System → Accounts→ Settings.

How to configure access to channels after logging out.
The available channels are marked with a blue background; if you deselect them, you will not be able to view the video.
The available channels are marked with a blue background; if you deselect them, you will not be able to view the video.
Dead zone in the ULTIMODE OR-20 OTDR.
Dead zone in the OTDR is created when measuring any reflectance, or reflective, event. In a fiber optic system, such events are usually connections. This zone is located behind the connector and includes a section of the fiber where the OTDR will not be able to record any events (other connectors, splices, bends, etc.).
Ultimode OR-20 L5830 OTDR
The size of the dead zone of the Ultimode OR-20 L5830 OTDR is 3 m (event dead zone, i.e. one in which the OTDR will not recognize another event of reflectance nature, such as connectors) and 12 m (attenuation dead zone, i.e. one in which the OTDR will not recognize and measure an event of purely attenuation nature, such as splice). In the case of an event dead zone, the mere recognition of a subsequent event is not the same as measuring its parameters. It can be roughly assumed that, in order for a subsequent connector to be measured, it must be outside the attenuation dead zone.
The following reflectograms were generated with an OTDR L5830 by increasing the width of the measurement pulse from 5 ns to 1 μs. A wider pulse increases the dynamics of the OTDR, making it possible to measure longer optical fibers. It can be perfectly seen that, as the width of the measurement pulse increases, the noise of the reflectogram is reduced. The consequence, however, is an increase in the width of the initial peak. This width corresponds to the initial dead zone.
Also, the connector of the reflectometer (OTDR) generates a dead zone. The size of this zone depends primarily on the width of the measurement pulse, the condition and cleanliness of the connector in the OTDR and the connector plugged into it (both should always be clean). Manufacturers, when declaring the size of dead zones for their devices, always specify them for the shortest measurement pulse. This is, of course, the most favorable case – the zones will then be the smallest.

The size of the dead zone depending on the pulse width in the Ultimode OR-20 L5830 OTDR. For 5 and 10 ns pulses, the width of the peak is identical (this means that the deciding factor here is not the pulse, but the electronics itself) and is about 10 meters. These pulses can be used to measure short lines of tens to hundreds of meters. For 25 ns and 50 ns pulses (measuring up to a maximum of several kilometers), the size of the dead zone does not exceed several meters, to reach around 20 meters for a 100 ns pulse. Longer pulses, allowing measurements of fiber optic cables of several to several tens of kilometers, generate dead zones reaching 50 – 90 m.
The size of the dead zone immediately downstream of the measuring device does not necessarily correspond 100% to the dead zone generated by any connector occurring further along the line. This one can depend on the distance of the connector from the OTDR and, most importantly, its reflectance – connectors that are more reflective can generate larger dead zones. Dirt on the connectors or their poor mutual alignment will have an even greater negative effect.
Care should be taken when configuring the OTDR. You should use the shortest possible pulses, but still provide the right level of dynamic range for the specific situation. The launch fibre is also important. It allows you to eliminate the dead zone behind the OTDR, and this makes it possible to measure the parameters of the first connector in the system. As can be seen from the above reflectograms, the length of such a fibre, especially when measuring the shortest lines, could be 20 m, but the production of launch fibers no shorter than 150 m has been accepted as a certain standard. It is also worth remembering that by taking a measurement from the other side of the fiber, the installer has the opportunity to see the events that occurred in the dead zones during the first measurement.

Dead zones for Ultimode OR-20 at different pulse width values – comparison of zones at the OTDR connector and at the end of a 160 m long launch fibre – SC/UPC type connector. The dead zones generated by the connector at the end of the launch fibre are shorter by several percent.
Termination of building telecommunications systems in the apartment.
Regardless of country-specific regulations, it is good practice to terminate teletechnical systems in a box located near the front door. The versatility of the boxes allows them to be used regardless of the number and type of systems in the building and the wiring used in it.The flush-mounted OMT-35 R96025 box can successfully serve as a distribution point for utilities in both apartments and single-family houses. It allows termination of copper cabling (twisted-pair cable, TV coaxial cable) and fiber optic cabling in various configurations. The box is divided into three parts – a smaller one, intended for making the wiring reserve, a larger one, where it is possible to place passive (e.g. splitters) or active (e.g. cable network modem, TV signal amplifier, etc.) installation components, and the third part – the panel, on which the termination and possible switching of wiring is performed.
The panel is equipped with Keystone holes, so it is possible to use universal connectors of this type, usually in the version with RJ-45 socket. In case the termination of the TV cabling (coaxial cable) and fiber optic cable is to be done with standard adapters, dedicated holes in the panel can be used for this, where F-F adapters and fiber optic adapters can be installed.

The application of the OMT-35 R96025 box in an apartment
DIPOL's portfolio also features other models of home junction boxes. Which will work best for you depends on the size of the casing, the mounting type of cable-termination connectors, the availability of a 230 VAC outlet, and the available space for spare cables.
Hikvision's 2-Wire HD flush-mounted DS-KIS704EY-ACF2/aluminum video intercom kit G73362 is a video intercom kit from Hikvision's 2-Wire HD system, which includes DS-KD7003EY-IME2/A door station main module, DS-KD-KP keypad module, DS-KD-ACF2 2-module flush-mount housing, DS-KAD7040EY audio, video and power distributor that allows connection of 4 devices, HDR-30-48 power supply, DS-KH7300EY-WTE2/White 7" monitor. It is a complete kit that can be installed to work in a small building, which can be further expanded. Refer to each product's data sheets and downloads for detailed information on the main devices included in the kit. | ||
Hikvision surface-mounted 2-Wire HD video intercom kit DS-KIS704EY-ACW2/aluminum Hikvision G73351 is a video intercom kit from Hikvision's 2-Wire HD system, which includes DS-KD7003EY-IME2/A door station main module, DS-KD-KP keypad module, DS-KD-ACW2 2-module surface enclosure, DS-KAD7040EY audio, video and power distributor allowing connection of 4 devices, HDR-30-48 power supply, DS-KH7300EY-WTE2/White 7” monitor. It is a complete set that can be installed to operate a small facility or form a base for further expansion. Refer to each product's data sheets and downloads for detailed information on the main devices included in the kit. | ||
Hikvision DS-2CD1321G2-LIU IP Dome Camera (2 MP, 2.8 mm, 0.01 lux, hybr. illuminator up to 20 m, Audio, H.265) The K00402 is a Hikvision IP ceiling camera designed for use in surveillance systems. The camera has a human object filtering function on motion detection to reduce false alarms. A 1/2.9” CMOS sensor with 2 MP resolution and a hybrid illuminator with a range of up to 20 m, ensure proper visibility in the absence of light. The 2.8 mm fixed focal length lens allows for a 101° viewing angle. A built-in microphone allows audio recording. | ||
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