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

Back to the moon.

The space agency NASA has released plans for the Artemis program to begin next year. If things go as planned, the final project will be landing of astronauts on the moon in 2024.

Man's return to the moon will cost $28 billion, $16 billion of which is the cost of the lunar lander. The last man, John Young, walked on the moon on April 20, 1972, the first was Neil Armstrong on July 21, 1969. The astronauts will travel in a spacecraft called Orion which will be launched on the Space Launch System - SLS rocket. The lander Orion is being developed in collaboration with Boeing.

The Orion spacecraft will be launched with the SLS under the Artemis I mission.

The operation under the Artemis I program has been scheduled for November 2021, and it will be an unmanned flight to test the SLS carrier system and the spacecraft alone. The Artemis II mission will fly with the crew on board in 2023, and the astronauts will go around the moon. Only in 2024, during the Artemis III mission, will the astronauts land on the Silver Globe and, more precisely, on its South Pole where they will stay for a week.

Camera measuring distance between people.

Keeping a safe distance between people is one of the best practices to avoid COVID-19 infection and to inhibit its spread. In locations where crowds are unavoidable, including supermarket checkouts or ticket kiosks at public transport hubs, managing the distance between queening people is of critical importance. It is a tough challenge that those who manage public space must face.

Hikvision cameras with two lenses, e.g. DS-2CD6825G0/C-IS K01764, allow you to verify compliance with the social distancing rules. They use stereoscopic 3D vision and Deep Learning algorithms, thus achieving extremely high accuracy. The system administrator can set the minimum distances between people. When it shortens below the set limit, an alarm, e.g. in the client software, or a signal at the alarm output will be activated.

Configuration of TERRA digital DVB-T modulators using a mobile app.

TERRA MHD001P R86103 and MHD002P digital modulators R86104 can be configured via the Google Chrome web browser (for Android and Windows) and WebBLE GreenParkSoftware application (for iOS – paid). Pairing and establishing communication between devices (smartphone, tablet, laptop) and the modulator is wireless via Bluetooth. To enable Bluetooth wireless communication of the modulators hold the "+" and "-" buttons simultaneously pressed, on plugging in to the 230 VAC wall outlet, until the green LED starts blinking. Then run the Google Chrome browser and enter the address: mhd.mydtv.live. TERRA modulators can also be configured in a standard way using the "+" and "-" buttons and the display under the enclosure.

Simple and intuitive configuration enables quick setting
of the required modulator parameters

Digital DVB-T modulators MHD001P R86103 and MHD002P R86104 can be configured
with buttons and display or using Bluetooth connection
via web browser

HDMI modulators are perfect for hospitals, stores, shopping malls, supermarkets, and electronics stores where content from one or two sources is delivered to multiple TV receivers. The important applications of the devices include also important applications in surveillance systems integrated with SMATV networks; they may be used to transmit DVR signals (more than ten camera-captured images) to all the terminal outlets. Digital modulators that do not support the HDCP protocol are employed, for instance, in surveillance systems to introduce the camera signal into the SMATV system.

Basics of IP addressing – part 2.

In the previous Weekly Review issue the IP address was discussed. Another important parameter is the mask. The subnet mask (for IPv4), as the IP address version 4, is a 32-bit number (for IPv6 it has 128 bits). The mask is used to distinguish the subnet part of the IP address, as well as the part that is the host address of that subnet. The subnet mask has a very specific structure. It begins with a sequence of ones and then turns into a string of zeros – the part with ones is the network part of the mask, while the string of zeros is the so-called host part.

For the IPv4, it is most commonly written in a form of four 8-bit numbers in decimal format and separated by periods (for example 255.255.255.0). The mask value has to be known to all routers and computers in a given subnet. As a result of comparing the address mask (e.g. 255.255.255.0) with a specific IP address (e.g. 192.168.1.122), the router is notified which part of the address identifies the subnet (in this case 192.168.1.), and which refers to the device with that IP address assigned (address ending: .122).

The table below compiles information on the subnet mask size (the number of bits in the network-related part of the address), and the corresponding number of available IP addresses within a given subnet. Note! The number of hosts is lower by 2 than that of the IP addresses allocated to a given subnet (2 addresses are occupied by the so-called network address and the broadcast address for a given network).

In the following issue of the Review, details on the calculation of the network and host address based on the network mask will be discussed.

Video intercom system for a single-family house with 2nd generation IP Hikvision.

A diagram of the Hikvision IP video intercom system for a single-family house is shown below. The system is based on the DS-KD8003-IME1 G73652 door/gate station main module with a built-in 2 MP camera, one call button and 2 relays to control the wicket and the entrance gate. Two 7” DS-KH8350-WTE1 G74003 monitors with an IPS display are installed in the apartment. The Ultipower N29980 switch with 4 PoE ports supporting 802.3af is used to supply the door/gate station and monitors. The system is connected to the Internet via the TP-Link Archer C7 AC1750 N3262 router. The wicket is controlled with the use of the Bira ES1-001 G74210 electric door strike with steel keeper/latch with 4 mm adjustment range, suitable for 12 V AC or DC power supply. It is supplied with the 12 V DC M1820 power supply.

IP video intercom system for a single-family house.
In the absence of the resident(s) in the apartment, the call can be redirected to a smartphone,
and its user may open the gate remotely.

On pressing the button, both panels in the house start ringing in parallel. After answering the call by the resident, two-way audio/video communication is established, and the resident can release the gate/door strike. In the absence of the resident(s) in the apartment, the call can be redirected to a smartphone, and its user may open the gate remotely. The built-in 256 MB memory in each of the monitors allows for recording photos, messages, as well as for leaving information in the absence of residents. The application Hik-Connect is dedicated for a smartphone control. For configuration and operation with a PC, the client application iVMS-4200 is available.

Splicing programs in Signal Fire splicers.

Installers often ask if Signal Fire AI-8C L5870 and AI-9 L5875 splicers are capable of joining fibers of different standards: G.652D, G.657A1, G.657A2, G.657B3 or OM2, OM3, OM4 etc.

Signal Fire fusion splicers offer three splicing programs: SM (single-mode), MM (multi-mode) and Auto (automated). Using a single program, say SM, you can splice single-mode fibers of any standard; practice shows that the splicer works equally well with fibers of the same and of different kinds (e.g. G.652D with G.657A2). Similarly, the MM program allows to join two multi-mode fibers together. This is very convenient; the parameters of the resultant splice may, but to not have to, be poorer.

More expensive models of fiber optic splicers from other manufacturers may have individual programs dedicated to specific fiber standards. However, as the installer’s practice shows, using them does not affect, or has a minimal beneficial effect on, the splicing. For that reason, most users opt for the fast automatic mode anyway.

How to connect a microphone to video monitoring devices? In CCTV systems it is possible to record video and sound. In an HD-TVI system, the audio module is to be connected to the "AUDIO IN" input of the DVR, and in the IP systems, it is connected to the camera that sends the audio signal to the DVR. The diagram below shows the connection between a Hikvision IP camera and the DS-2FP2020 DS-2FP2020 M1918 audio module >>>more

M1918 microphone and an IP camera connection diagram

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