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

Smart chipsets from SONY.

SONY is launching two chipsets: the IMX636 with 0.92 MP resolution and IMX637 with 0.33 MP resolution. They are not impressive in terms of resolution, but they can filter the events occurring in the frame observed by the camera. Consider, for example, a ball moving in the frame, but in the case of a traditional image sensor, both the ball and the unchanging background are recorded at intervals determined by the number of frames per second. Event-based vision sensors (EVS) enable high-speed, low-latency output by having each pixel asynchronously detect luminance changes and send differential data only after combining it with coordinate and timing information.

Chips of this type can be used in recognition systems to increase the efficiency of data delivery, ideal for various applications in the industrial sector such as fast moving object detection, equipment monitoring, motion detection analysis and image recognition. An example of this is the detection of sparks produced during welding or metal cutting processes. Sensors can also help improve production in a variety of applications that frame-based image sensors struggle with, as well as support human experience-based workflows.
To cope with the diverse applications, the sensors are equipped with special filters to filter out unnecessary data for an event, such as the flicker of an LED that is very likely not the outline of a moving object.

SONY's original miniaturization technology, based on a stacked CMOS image sensor structure, using a Cu-Cu junction to achieve conduction between the pixel array and the logic circuit, has created the industry's smallest high fill factor pixel at 4.86 microns. Mass production of IMX636/637 sensors will begin in May 2022.

Messaging tenants via Hikvision IP video intercom system.

The iVMS-4200 application allows you to send messages to selected tenants. It is particularly useful in more complex systems, as it allows you to quickly convey important information to all users (notification about breakdowns, maintenance activities or management-related issues). Messages can be sent after configuring the system, creating an organization, adding authorized users and assigning them to individual indoor station (completing the resident information). To do this, after starting the iVMS-4200 application, go to the tab:

After the available options are completed (message subject, type, photo, content) and confirming with the Send button, the message will be displayed on the monitors of the indicated subscribers.

###03##DVB-T2/HEVC standard. The release of the 700 MHz band and reorganization of DVB-T terrestrial TV multiplexes (frequency refarming) by the EU countries for the needs of mobile operators (5G services) is also associated with the transition from the current DVB-T/H.264 (MPEG4/AVC) standard to the DVB-T2/HEVC (H.265) standard. Only TV sets capable of decoding so compressed picture and sound are able to correctly receive television programs. A number of DVB-T TV sets now in use are not equipped with a DVB-T2 decoder and can only display images encoded to legacy video coding standard. After the transition to DVB-T2/HEVC transmission standard, those TVs will no longer "recognize” the broadcast content and an external decoder will have to be purchased. DIPOL has introduced 2 models of DVB-T2/HEVC receivers: Signal T2-MINI A99313 and Signal T2-BOX A99314.

Signal T2-MINI A99313 dedicated for those who want to hide the receiver behind the TV. This receiver, as one of the few of its kind on the market, has an infrared sensor with LED indicating the status of the device on the attached cable, so you can control a receiver that is invisible.

The greatest advantage of the Signal T2-MINI receiver is its compact size and power supply from the USB port of the TV set or any external USB power adapter. The device remains practically invisible for the user when plugged directly into the HDMI input of the TV set. The receiver is perfect for wall-mounted TVs and enables you to place the device in such a way that it fits between the TV and the wall or a bracket. The only thing to remember is to provide adequate ventilation to the device. Hidden behind the TV set the receiver receives control signals from the remote control via an infrared sensor placed on a short cable. For the device to work properly the infrared , sensor should be attached to the front panel of the TV.

The Signal T2-BOX receiver is a multi-functional device in a small, elegant box. The front panel of the Signal T2-BOX features an alphanumeric LED display showing the number of the currently watched program and operating modes, IR LED, and USB connector.

Automatic download of recordings from mobile DVR via WiFi network.

Companies dealing with transport of cargo and people, deliveries or waste collection often decide to use video monitoring and to record drive parameters. Recordings are stored locally on disks of the DVR. Such disks have limited capacity, and the way of using the DVR causes a high risk of damaging the data carriers. It is a good idea to periodically download the data without having to move the disks. This can be done via radio network.

The Protect 218 M80218 mobile DVR has a built-in 2.4 and 5 GHz dual-band WiFi module. It supports IEEE 802.11 a/b/g/n/ac standards. This allows the recordings from the DVR to be automatically uploaded to the recording server. The vehicle, upon arrival at the depot connects to the WiFi network where the recording server service is running (free IVMS software is included). The synchronization of the recording is automatic. The device is equipped with two antennas which further increases the stability and speed of data transmission to the server.

2.5 Gbps switch for home network.

TP-Link's TL-SG108-M2 N30212 switch features 8 ports operating at 2.5 Gbps to take full advantage of multi-gigabit networking potential. The device provides switching capacity of 40 Gbps. The product is designed to build a network at home and in the office to ensure high transfers through the LAN.

A fast and efficient LAN at home is ideal if you have private media content, such as photos and videos, stored on a Network Attached Storage (NAS) drive. The 2.5 Gbps speed will allow seamless access to the entire library with the ability to stream content at the highest resolution. Moreover, speeds up to 2.5 Gbps do not require Cat. 6 cable.

Why multimode fibres?!

Despite the huge popularity of single-mode fiber optics, the multimode fibers are still on the market and are used in selected applications. In theory, the multimode fibers are considered "less future-proof" – on short and medium distances they are not able to match single mode fibers in terms of throughput, while on distances longer than 2 km they are not used at all due to the phenomenon of so called modal dispersion. What is more, it turns out that multi-mode cables, despite their capacity limitations, are more expensive than single-mode cables. This is due to the fact that multimode fiber core, having gradient structure (refractive index changes and is not homogeneous like in single mode fiber core) is more complex and therefore more expensive to manufacture. So why use multimode fibres?

Oddly enough, multimode cabling is often used in server rooms to connect cabinets containing operator equipment. Special lasers and the latest standards of multimode fibers (OM4, OM5) work well there for high throughput transmissions on short distances. Moreover, when extending systems implemented a few or more years ago, installers often decide to use the same type of cabling – there is no point in changing it if it works.

Other reasons for choosing multimode cables include popular opinion that they are easier to splice (due to larger core). This ceased to hold true long ago – in the era of precision core centering splicer, the size of the core no longer matters. According to other theories, multimode cables should be used for short distances and single-mode cables for long distances (> 2 km). This is no longer true either in the era when the single-mode devices offered can operate without overdriving on links of any length.

Use of cabling with multimode fibers seems to be reasonable when the system is installed in difficult environmental conditions, e.g. in industrial facilities where there is a risk of exposure to dust or dirt. A larger core of a multimode fiber is beneficial here – the same contamination (see figure above) will have a much greater negative impact on transmission in a single mode fiber (9 μm core) than in the multimode fiber (50 μm core). This difference may not become apparent in fiber splicing, where the operator cares for cleanliness and reduces the influence of external factors. However, it may be important in a switchgear and when connecting, disconnecting or rewiring equipment, if the installer fails to properly clean the ferrule face of the connector.

Incorrect cleaver height as a reason for bad optical fiber cut 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...>>>more