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no. 4/2022 (January 24, 2022)
Augmented reality contact lenses.
InWith unveiled the world's first electronic contact lenses at CES2022. They are soft like regular lenses, but have embedded electronics that can perform a variety of functions. The manufacturers' vision is that the lenses connect to a smartphone or other device and display messages and information in real time. For example, driving a car you will see information from navigation, such as a turn or speed limit, being in a store will display information about a particular product, etc. This is how the augmented reality system is built.
The design of wearable electronic devices must provide comfort of use. The modern systems are built based on crystalline semiconductors (usually silicon and germanium). They are very rigid and do not yield to stretching or bending. Resistors and capacitors are not a problem but microcontrollers and processors are. Moreover, the available surface area is very limited, so it is even more difficult to place them on the most sensitive part of the human body, i.e. the eye. What is more, the available space is severely limited and damp. InWidth has integrated electronic components on the hydrogel substrate used for lens construction. In doing so, they confirmed that integration of electronics into lenses is possible. What they did not show was any technique to display something, and this is another step in the development of this type of device. The manufacturer has also tried to test the safety of use, which is expected to be confirmed by the US Food and Drug Administration later this year. If they actually manage to master the construction of displays on such a material, we are in for another revolution in the electronics market.
Automatic start of live monitoring when connecting to Hikvision DVR via Internet browser.
When connected to Hikvision DVR via web browser, automatic live preview playback is disabled by default. The preview can be activated for all cameras each time from the main window and the type of stream played can be specified. In the local configuration, after logging in to the DVR, it is possible to enable automatic live playback. It is also possible to specify the type of stream from which the cameras are to be displayed during automatic playback (main or auxiliary stream). This configuration applies to the specific browser running on the computer. The settings can be changed after logging in to the DVR in the Configuration -> Local tab.
View of the configuration window for automatic playback of live images after logging in to the DS-7608NXI-I2 Hikvision DVR via a web browser
DVB-T2 digital terrestrial television – 700 MHz band filtering.
The 5G technology is the nearest future of the telecommunications market. However, for this to happen, appropriate infrastructure and allocation of RF bands is necessary. In most EU countries, work is underway to organize the radio spectrum and make the planned bands available for telecommunications services. To this end, the EU countries will have to free up the 700 MHz band and reorganize the DVB-T terrestrial multiplexes (frequency refarming) for the needs of mobile operators (5G services), as well as in connection with the transition to DVB-T2/HEVC broadcasting standard. Terrestrial TV systems commissioned in previous years are completely immune to interference from LTE transmitters. The highest-frequency TV channels with numbers 49 and 50 are most prone to interference. The image on the TV screen may freeze, colored stripes and squares (picture frameup) may appear. To exclude the interference of LTE transmitters on DVB-T/T2 reception, special internal and external filters were developed and patented.
LTE 700 Rejection Filter TERRA TF001 (mast mount) R81009
Note that all users of terrestrial TV are at risk, also those who receive programs on much lower channels than those mentioned above. Strong signal from LTE transmitters may overdrive the amplifiers placed in the antennas, effectively making it impossible to receive television. Filters eliminating unwanted signals should be used just behind the antenna and before the amplifier, if any.
Incorrect cleaver height as a reason for bad optical fiber cleft.
Proper preparation of the ends of optical fibers is the basis for successful fiber splicing. Even the best and most expensive splicer will not be able to properly connect dirty or improperly cut fibers. For this reason, care for the cleanliness of fiber optic tools is extremely important. A good, clean and well-adjusted fiber optic cleaver guarantees correct and precise cleaving of fibers.Before proceeding with the adjustment of the cleaver height, it is good to find out whether the blade in the tool is set too high or too low. Of course, it may happen that the installer is not able to determine that during the initial assessment. A good practice then is to deliberately lower or raise the blade to the extreme positions. After reaching one of the extreme positions, gradually lower/raise the blade to set the optimal position. The effect of each change in height should be checked on the splicer display. It is important to do that for two fibers. It may also happen that the fiber looks good on one side and on the other not. It is also important to tighten all stabilizing screws after changing the height.
More tips on how to properly position the blade can be found in the article Cleaving optical fibers without secrets – blade adjustment.
An example of a bad result caused by too high blade position.
The fiber end face is jagged. A characteristic feature of fibers cleft with a blade set too high is damage to the fiber core (in the bright area).
The fiber end face is jagged. A characteristic feature of fibers cleft with a blade set too high is damage to the fiber core (in the bright area).
An example of an improper result caused by a little too low blade position.
The fiber is not cleft throughout the entire cross-section (visible a "clove"). The shape and size of the "clove" may of course vary.
The fiber is not cleft throughout the entire cross-section (visible a "clove"). The shape and size of the "clove" may of course vary.
Omada SDN – platform for configuring and controlling TP-Link network infrastructure. The Omada platform integrates network devices such as access points, switches, and gateways. It provides comprehensive management of the entire network from the cloud level. The system allows you to create a highly scalable network, fully controlled by a single system. This results in seamless wired and wireless connections that are essential in hospitality, education, retail, offices and many other industries.
Benefits of using Omada SDN:
- AI-based network diagnostic technology:
- enables analysis of potential network problems,
- sends network optimization suggestions,
- helps locate sources of interference, alert and notify users, and implement solutions to enhance network security,
- ensures stable performance and significantly reduces Wi-Fi interference by automatically adjusting the channel and transmission power settings of nearby access points (connected in an Omada system).
- Easy and intelligent network status monitoring:
- easy-to-use dashboard is very helpful to continuously monitor network status, check network bandwidth and traffic levels,
- access logs with network statistics, alerts and warnings,
- graphical representation of network topology allows IT professionals to quickly diagnose any connectivity issues.
- comprehensive network security:
- TP-Link Omada separates network management resources from user data so that user-generated traffic is not processed in the cloud for better protection of user privacy,
- creating VPN connections,
- network firewall,
- URL/IP/MAC filtering,
- advanced WPA3 encryption,
- welcome page for users connected via WiFi.
EAP TP-Link Omada Cloud Controller OC200 N2560
 | Protect 2018 mobile DVR M80218 is designed to be mounted inside the cab of a vehicle, e.g. under the seat, in a glove compartment etc. The power cables have to be connected to the battery and ignition switch (similar to radio), so that the device automatically begins video and audio recording simultaneously with turning on the ignition. The power circuit is protected by 5 A fuse which protects against excessive current drawing and burning of the wiring in the event of a fault. By default, the recorder runs until the power supply is turned off with the ignition key, unless the delayed turn off function (running for a specified time after switching off) or a schedule function is active. The DVR has also its own power backup and runs for about 8 seconds more to safely save all data. | |
 | The DS-2CD2047G2-LU(C) K03119 is an EasyIP 4.0 Series compact IP camera from Hikvision that combines two key technologies: ColorVu and AcuSense (2nd gen). With ColorVu technology, the camera can capture color images round the clock while retaining important identification details. The AcuSense technology increases the effectiveness of the surveillance system by eliminating false and nuisance alarms through human/vehicle object filtering. The camera is equipped with a 1/1.8” Progressive Scan CMOS sensor with a resolution of 4 MP featuring very high sensitivity and ability to capture images in low light conditions. | |
 | Hikvision DS-7608NI-K1(C) DVR K22067 is a modern 8-channel IP recorder recording image from IP cameras with a resolution of up to 8 MP. It is equipped with parallel HDMI/VGA outputs that display the same image. One SATA port enables the connection of hard drives with a capacity of up to 8 TB. If the memory is full, automatic overwriting is triggered to prevent the loss of the latest data. The built-in USB ports allow you to connect a USB flash drive or external disk and copy specific fragments to external data carriers. | |
Worth reading
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