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

No. 35/2020 (Nov. 2, 2020)

Historic landing on an asteroid.

On October 20, NASA successfully completed another mission. For the first time in NASA history, the OSIRIS-REx probe collected a sample from Bennu asteroid (more than 321 million kilometers distant from the Earth). The head of NASA has acknowledged that it is the largest sample of space rocks that will be delivered to Earth since the lunar Apollo missions. It is worth adding that NASA is not the first agency in history to accomplish such a mission. In 2010, the Japanese space agency JAXA took samples from Itokawa asteroid.
The descent alone onto Bennu lasted about 4.5 hours. While landing, the probe extended an 11-meter arm that collected dust and rock covering the surface of the asteroid in an operation that took just 6 seconds. The probe is expected to return with the samples in September 2023. The samples collected may hold clues as to how water, and thus life, originated on Earth.
Video of the Touch-And-Go (TAG) operation of the OSIRIS-REx probe
According to scientists, Bennu was formed about 4.5 billion years ago, which is about the time when the Solar System came into existence. Bennu is considered a near-Earth asteroid - the risk of collision with our planet is estimated to be 1: 2700.

Advantages of fiber optic cabling in SMATV systems.

Originally located on the roofs of buildings, the SMATV systems are particularly prone to surges caused by lightning. In spite of proper grounding of all system components, some devices suffer irreparable damage. It has to be stressed that not only the system devices alone are exposed to surges, but, in extreme cases, the subscriber equipment, such as satellite receivers or TV sets, are also affected. Fiber optic cable provides excellent surge insulation. This means that any electric charges induced near the antennas will stop at the very downstream optical transmitter, so the remaining components of the system are 100% protected.
The effects of surges in SMATV systems can be very costly.
The use of optical fibers eliminates the problem.
Optical fiber cables are safe to be placed together with copper cabling for transmission of other signals or power (100% resistance to electromagnetic interference). The diagram below shows an example of an optical-copper cabling that enables the transmission of TV/SAT signals.
TV Optical Transmitter TERRA OT501W (SAT/DVB-T, 6dBm)Optical Splitter: TOS 04D (4-OUT, FC/PC connectors)Optical Receiver TERRA OR501MW (QUAD + DVB-T/DAB/FM)5/32 Multiswitch: Terra MV-532 (IF gain adjustment, class A)Optical Receiver TERRA OR501W (QUATRO + DVB-T/DAB/FM)QUATRO LNB: Inverto BLACK Ultra 0.2dBUHF TV DVB-T/T2 Antenna: DIPOL 44/21-60 Tri DigitSatellite Dish TELMOR 120 TT Standard (graphite)
The system assumes the transmission of the RF signals from antennas via fiber-optic links to an optical receiver or (in the picture) a group of optical receivers (with the use of optical splitters), and then, after conversion, distribution of electrical signals by means of multiswitches and coaxial cables.

Protecting a single mechanical splice.

L5550 mechanical splices are often used in IP surveillance systems. The signal from an IP camera is sent to the media converter, and then transmitted via optical fiber to the DVR. The installers mostly want to save as much space as possible in junction boxes next to the cameras. Covers of mechanical splices might be of help, which, with the cables and pigtails being worked on properly, allow to eliminate the need for much larger junction boxes.
The L5559 cover, made of durable plastic, is designed for cable connections with 2-3 mm outer sheath. With specially designed fasteners, the cover absorbs longitudinal stresses, to fully protect the fiber. The 91 mm long structure prevents the cable from being bent right next to the splice.

Cost effective monitoring using Hikvision IP EasyIP Lite series cameras.

The diagram below shows an IP CCTV monitoring system based on Hikvision cameras and a DVR. EasyIP Lite series cameras are used in the monitoring system. This series is distinct for good image quality and affordable pricing. Basic alarm events, such as motion detection or image tampering, are supported. 2 MP cameras with a focal length of 2.8 mm and an IR illuminator up to 30 m based on the EXIR 2.0 technology are installed in the facility. For outdoor use, the DS-2CD1023G0-I K17661 cameras are recommended, and for indoor installation, the DS-2CD1123G0-I K17262 ceiling cameras are the right option. The Seagate SkyHawk 2 TB M89271 hard drive used in the recorder ensures the storage of recordings with continuous recording from all cameras for 11 days when using H.265 compression (2 MP @ 25 fps, 2 Mbps). The entire system is powered by the PoE N299851 switch. An 8-channel Hikvision DS-7608NI-K2 K22074 IP DVR is used to record the image. To enable access to the recorder via Internet or Wi-Fi, you can connect a router to the system, e.g. the TP-Link C2 AC900 N3255.
Compact IP Camera: Hikvision DS-2CD1023G0-I (2MP, 2.8mm, 0.028 lx, IR up to 30m, H.265/H.264)Ceiling IP Camera: HikvisionDS-2CD1123G0-I (2MP, 2.8mm, 0.028 lx, IK10, IR up to 30m, H.265/H.264)4K IP NVR: Hikvision DS-7608NI-K2 (8ch, 80Mbps, 2xSATA, Alarm IN/OUT, VGA, HDMI, H.265/H.264)HDD Seagate SkyHawk ST2000VX008E 2TB (3.528Wireless Dual-band Gigabit Router: TP-Link Archer C6 AC1200 (4x10/100/1000 Mbps)PoE Switch: ULTIPOWER PRO0208afat (120W, 10xRJ45,  8xPoE 802.3af/at, PoE Auto Check)
IP CCTV system based on EasyIP Lite cameras

Basics of IP addressing – part 6.

The previous issue discussed the details of network ports. Another important parameter is the DNS. To change public (external) IP addresses from numeric to a domain format, the DNS (Domain Name System) service is used. Hence, there is no need to remember the addresses e.g. in the format, but just a much more friendly www.dipolnet.com instead.
Overview of a communication procedure between the client and server using DNS addresses
1. What is the IP of www.dipolnet.com (query to the DNS server)?
2. www.dipolnet.com is
3. Hello,! Send me your website
4. Here is my website
Translation of the domain name into the set of numbers is performed by the appropriate DNS server, to which the computer sends a request for the translation of the address. After receiving the response with the numeric address, the computer connects to the relevant computer/server.
The DDNS will be discussed in detail in the following issue of this Weekly Review.

Advanced motion detection configuration.

Hikvision IP cameras (except for some design devices) can define 8 independent motion detection zones, where each zone can have different sensitivity and detect objects of different sizes. This can avoid problems which may be caused by moving parts of the scene (e.g. leaves and branches moved by the wind), then the sensitivity in this zone should be reduced. Moreover, detection parameters can be different in each zone for day and night modes. In night mode, cameras often generate noise that can be recognized as motion by analytical algorithms. Therefore, it is recommended to reduce the sensitivity of motion detection in the night mode.
The settings mentioned are available after selecting an advanced configuration option of motion detection.
Advanced motion detection configuration panel

New products offered by DIPOL

PoE Switch: TP-Link TL-SF1006P 6xFE(4xPoE) 802.3af/at 67W
TP-Link TL-SF1006P 6xFE (4xPoE) 802.3af/at 67W PoE switch N29929 is a desktop device ensuring smooth network transmission in 10 and 100 Mbps networks. It has 6 RJ45 ports supporting automatic connection speed negotiation. Four of them support the Power over Ethernet (PoE + 802.3af/at). The switch automatically detects PD devices compliant with IEEE 802.3af or IEEE 802.3at standard and supplies them. This way, it is easy to power network devices located in places without access to AC lines, such as access points, IP cameras, IP phones etc.
Powerline Adapter: TP-LINK TL-PA7017 KIT
TP-LINK TL-PA7017 KIT powerline adapter kit N3370 transmits Ethernet signal through the existing electrical wiring. It is an ideal solution when it is not possible to use a twisted-pair cable or when using a wireless network is not possible or not convenient.

Junction box DS-1280ZJ-DM46 for Hikvision dome cameras
DS-1280ZJ-DM46 junction box M57181 is designed for HIKVISION dome cameras. Made of aluminum alloy, it allows for covering cable connections, video transformers etc.

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