TV-SAT, CCTV, WLAN Dipol Weekly Review

Another step for 6G networks.

Researchers at Tokushima University have demonstrated 112 Gbps wireless data transmission in the 560 GHz band, using so-called soliton optical microcombs. This is an important step in the development of future 6G networks, which are expected to offer much higher speeds than current technologies.

Current electronic circuits have difficulty generating stable signals at frequencies above 350 GHz. As frequency increases, signal strength decreases and interference increases, making it difficult to transmit data at very high speeds. This is the reason why the development of communications in the terahertz (THz) frequency range, considered crucial for 6G networks, has so far been severely limited.

To solve this problem, researchers have developed a terahertz communication system using optical microbeams. This technology makes it possible to generate extremely stable signals with very low interference. This enabled 112 Gbps of data transmission to be achieved in the 560 GHz band, which is significantly better than most terahertz systems to date, which typically achieved a few to tens of gigabits per second.

Furthermore, this is the first demonstration of wireless communication exceeding 100 Gbps at frequencies above 420 GHz, opening up new possibilities for future wireless technologies. At the heart of the solution is a compact device using an optical fibre directly connected to a microresonator made of silicon nitride. This solution eliminates the need for high-precision alignment of optical components, reduces the size of the entire system, increases its operational stability and enables long-term operation at high power. In addition, temperature control of the microresonator is used, which improves the repeatability of performance and reduces the impact of ambient temperature variations.

In the experiment, two very stable optical signals were generated and encoded using QPSK and 16QAM modulation methods. These were then converted into a 560 GHz terahertz wave and transmitted wirelessly. According to Prof Takeshi Yasui, this is a significant step towards the practical implementation of 6G networks and ultrafast connections between base stations. In the next stages of the research, the scientists want to further reduce signal interference, increase the transmission range and use more advanced data coding methods to achieve even higher speeds.

Redundant power supply for SIGNAL PRO multiswitches - reliability of RTV/SAT installations.

In modern satellite and terrestrial TV installations stable power supply for multiswitches is crucial for uninterrupted signal reception. The SIGNAL PROfessional series of multiswitches has been designed with reliability in mind and is equipped with the so-called redundant power supply system. Imagine that our installation consists of a cascade of, for example, 5 SIGNAL PROfessional multiswitches and one MS-900 R69900 amplifier. In this case we can use three power supplies that cover the power requirements of the multiswitches and the system of two quatro converters. In the event of a failure of one of the power supplies, the other two take over the entire power supply of the set of multiswitches. This way the user can be sure that RTV/SAT signal will be available even if one of the power supplies is damaged or overloaded. The installation's maintenance technician should check the operation of the power supplies during periodic inspections and, if necessary, replace the damaged one.

This solution significantly increases the operational safety of the entire installation, especially in large collective systems, e.g. in hotels, apartment buildings or office blocks, where interruptions to the TV signal are unacceptable. Redundant power supply minimises the risk of service downtime, reduces maintenance costs and extends the life of the equipment. An additional advantage of SIGNAL PRO multiswitches is their high parameter stability and ability to operate in demanding conditions, which makes them PRO-class solutions. Thanks to the built-in power protection system, installers and network administrators can offer users access to satellite and terrestrial signals at the highest level of reliability.

Controlling the second relay using a card in Hikvision IP modular video door stations.

If a card reader is connected to the door stations of a modular IP video door entry system (DS-KD8003-IME1(B) G73652) or 2-Wire (DS-KD8003Y-IME2 G73646), e.g.: DS-KD-M G73662 it will be possible to control the first or second relay using the tag. Configuration can be done e.g. using the iVMS-4200 application or a web browser. After logging in to the main module of the door station using the browser, first activate the second relay under Configuration -> Intercom → I/O settings, then select Output2 in the Output No. tab and in the Output tab select the Electrical lock option. After this action, the second relay will be available to the user. Then add a user, assign a card to the user and specify whether Door1 or Door2 relay should be controlled when the card is applied.

How does the LR150 function work in ATTE switches?

In situations where the distance between signal distribution points exceeds the standard 100 m and at the same time multiple devices need to be connected on a single line, traditional solutions require the use of an additional local power supply or the conversion of the network infrastructure.
Such installations can benefit from ATTE switches equipped with the LR150 function.
The LR150 (Long Range 150m) provides stable data transmission and active PoE power over distances of up to 150m while maintaining full 100 Mbps throughput. This makes it possible to maintain the full functionality of the installation even at longer distances between signal distribution points.
An additional advantage of the solution is the possibility of cascade connections. When using two ATTE switches with the LR150 function, the maximum length of the entire transmission path can be up to 300 m. This is the maximum recommended distance for this type of connection. Available models with this function: N29821, N29823, N29827, N29824, N29825.

Why 3 wavelengths in a reflectometer?

Having an OTDR with the ability to measure at 3 wavelengths comes with a number of benefits. The first is the ability to fulfil customer orders to their specifications. Requirements for reflectometric measurements range from those where the customer expects measurements at 1310 nm and 1550 nm to those where only measurements at 1625 nm are expected (mainly measurements in larger operators' networks). The OR-30 L5835 can handle any of these types of requests.

Another benefit is the possibility of full diagnostics of the system being made. The additional 1625 nm laser makes it possible to detect any macro-bends in the system that would not necessarily manifest themselves with 1310/1550 nm measurements. The higher wavelength, due to occupying a larger area of the MFD in the fiber, is more sensitive to leakage at bends, resulting in increased attenuation. However, it is worth making measurements at lower wavelengths as well, since it is at these wavelengths that transmission is usually realized. In addition, the 1310 nm wavelength helps highlight fiber positioning problems (poor connectors, splices). To summarize, 3-wave measurement is a complete measurement and provides full information about the network.

Buffer power supply for mobile systems. In vehicles, additional systems such as a mobile DVR, network devices, LTE routers, communication modules or other systems requiring a constant power supply are sometimes installed. To ensure their continuous operation irrespective of the ignition status, ATTE has developed the universal buffer module LVUPS-140-UN1-OF M18725, designed for use with 12 V or 24 V vehicle installations. Its main task is to ensure the continuity of power supply to network devices - both while driving and when the vehicle is stationary. This ensures that the monitoring system remains active even when the engine is switched off, without the risk of discharging the main car battery...>>>more