DIPOL Weekly Review – TV and SAT TV, CCTV, WLAN

Will oxy-ion batteries replace traditional batteries?

A group of researchers at Vienna University of Technology has developed a new type of oxy-ion battery that could be an excellent solution for large-scale renewable electricity storage systems. The new battery idea has been registered as a patent application. Lithium-ion batteries are omnipresent today, from electric cars to smartphones. However, this does not mean that they are the best solution for all application areas. According to the researchers, oxygen-ion batteries work in a similar way to lithium-ion batteries. Ions that gain electric charge by accepting or losing electrons jump between two surfaces and produce electric current. In the case of these new batteries, these surfaces are made of ceramics. The oxygen-ion battery has several important advantages. Although it does not allow as high an energy density as a lithium-ion battery, its capacity does not diminish irretrievably over time. It can be regenerated, allowing for an extremely long life. In addition, oxy-ion batteries can be manufactured without rare elements and are made of non-flammable materials. The problem with many types of batteries is that, at some point, the charge carriers can no longer move. Then they are no longer suitable for generating current, and the capacity of the battery decreases. After many charging cycles, this can become a serious problem.

The new battery concept is not designed for smartphones or electric cars, because oxy-ion batteries only achieve about a third of the energy density of lithium-ion batteries. In addition, oxy-ion batteries operate at temperatures between 200°C and 400°C. However, the technology is extremely interesting for solar or wind energy storage.

DVB-T2 system vs. LTE interfering signal.

The 700 MHz band is no longer used for terrestrial TV signals. This band has been made available to mobile network operators for 5G/LTE services. Therefore, the TV channels with the highest frequencies (channels above 40) are the most at risk of interference from LTE transmitters. The image on the TV screen may freeze, colored stripes and squares (picture frameup) may appear. How can such a diagnosis be confirmed? The best way is to hire an installer who is equipped with a professional meter.

Diagnosing the type and levels of signals often requires specialized methods. They will provide the information obtained as a basis for proper analysis and interpretation of making changes to the installation. One of the functionalities that provide such data is a spectrum analyzer (spectrogram), which examines and analyzes the frequency spectrum of all signals in the system in real time. A signal spectrum is the distribution of the intensity of desired signals and interfering signals (especially LTE) as a function of frequency.

Batch time synchronization in Hikvision devices.

The iVMS-4200 application allows batch synchronization in all devices that have been added to the application. Incorrect time setting can cause many problems. In the case of CCTV systems, it can make it difficult to determine the exact time of an incident, and in the case of video door entry systems it can cause problems with correct operation of tags according to a schedule. Synchronization can be done in a number of ways, such as when adding to an app or when directly logging into a device. For a batch update the time in iVMS-4200, after adding devices, go to: Menu -> Tool -> Batch Time Sync.

Extended 10 Gbps network.

A 10 Gbps network is a computer network that allows data to be transmitted at speeds of up to 10 gigabits per second. Such high bandwidth is currently used in large enterprises, data centers and research laboratories. It allows large amounts of data to be exchanged in a short period of time which is especially important for applications such as cloud computing, high-quality video transmission or transferring large amounts of scientific data.

The backbone network uses fiber optics as the main transmission medium. An important aspect is that active devices support SFP (small form-factor pluggable) modules. Such ports in the devices are labelled SFP+ (in many devices, SFP+ slots also allow connection of 1 Gbps SFP inserts).

Below is an extended computer and WiFi network with a 10 Gbps backbone using the main SFP+ switch N30121. Note that further switches should always be connected directly to it. A network designed in this way allows for simpler management and configuration of features such as virtual networks while maintaining high performance.

Fiber optic transmission windows.

The transmission of data via optical fibers is usually performed in one (or more) "telecom windows" selected from the three (or sometimes even five) wavelength bands that are the most favorable for this purpose. The windows have been selected based on the characteristics of signal attenuation in the transmission medium.

There are three main causes of signal attenuation in optical fibers:

Individual transmission techniques are implemented in specific telecom windows, e.g. DWDM multiplexing technique mainly uses the third and fourth windows. Thanks to technological advances in the production of optical fibers, it was possible to reduce the effect of OH- ions in the vicinity of the 1400 nm wavelength (G.652D fiber) and create another, fifth transmission window.

Hybrid dSCR/Unicable multiswitch system. TERRA's dSCR series of multiswitches are single-cable (Unicable) devices that allow distribution of DVB-S/S2 satellite, DVB-T terrestrial TV and analog/DAB radio signals over a single coaxial cable based on digital channel stacking technology using analog-to-digital converters. Communication between the multiswitch and satellite receivers uses a special protocol, defined in EN50494 (Unicable I) and/or EN50607 (Unicable II), which uses DiSEqC commands to allow independent signal division using a single cable...>>>more