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No. 32/2018 (Oct. 15, 2018)
Selecting Wi-Fi equipment will now be simple.
When purchasing a WiFi router, the user must read the router's specification in detail to find out what standard it supports and to check if the standard is the latest, providing the fastest connections. Wi-Fi networks have been present for nearly 20 years, and the naming of standards for the average user is still complicated - the terms 802.11a/b/g/n/ac are not very informative for a typical user.So far, Wi-Fi versions have been identified by a letter or two letters that referred to the wireless standard. The latest version has the designation 802.11ac, the earlier are 802.11n, 802.11g, 802.11a and 802.11b. The Wi-Fi Alliance (an association of over 300 companies, including hardware and software manufacturers, dealing in the promotion and compatibility of subsequent versions of Wi-Fi equipment) has changed the labeling system.
The existing wireless network standards have been numbered consecutively:
- Wi-Fi 1 (802.11b),
- Wi-Fi 2 (802.11a),
- Wi-Fi 3 (802.11g),
- Wi-Fi 4 (802.11n),
- Wi-Fi 5 (802.11ac),
- Wi-Fi 6 (802.11ax).
Now, instead of wondering if the "ac" standard is better than the "n" standard, it is enough to check the number and choose the highest one. The main benefit is the possibility to quickly select the "fastest" device among many others on the shelf.
The Winners of the DIPOL's Summer Holiday Contest 2018!
We thank all the contestants for taking part in the 17th edition of the "Engagingly about Antennas" contest. This year we received as much as 260 works! Traditionally, the pictures were adjudicated by professional photographer Pawel Zechenter. The winners will get three main prizes and 16 distinctions! We congratulate the winners and invite everyone to take part in our competition in the next holiday season :)1st place - Agnieszka Rusinowska
Pyramids
2nd place - Kenese Szilárd
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Hierarchy | Példakép | Vonalak |
3rd place - Katarzyna Caban
Rodzina w komplecie (A full family)
Distinctions:
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Maciej Kędzierewicz Nocny maszt antenowy | Grzegorz Malczewski Im więcej tym lepiej | Katarzyna Kaszycka Ptasie radio |
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Vilmundur Sigurdsson The Elfs in Iceland need antennas too | Hanna Strzykowska W zielonej otulinie | Krzysztof Jarno W górskich warunkach propagacji |
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Wojciech Bielecki kable kontra anteny | Jacek Piecuch Centrum wszechświata | Dorota Popiela Hotbird |
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Tomasz Hulak Centrum wszechświata | Helena Drożdża W zwartym szyku | István Szőnyi Transmisja stereofoniczna |
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Joanna Legenc Ptaki i anteny | Radosław Wiśniewski 3 eskadry anten logarytmicznych nad Syrakuzami | Piotr Tomala Anteny b&w |
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Mateusz Bołtruczyk W czerni i bieli |
DVB-T television and the Internet via one UTP cable.
Low-voltage systems in office buildings often do not include TV antenna cables, but are usually fitted with structural cabling based on UTP cables. When some users want to connect televisions to watch DVB-T broadcasts, the lack of an RF distribution system may be a major obstacle (in many locations TV signals cannot be properly received using indoor antennas).A unique solution to this problem is to use SIGNAL TV-LAN baluns for TV over UTP, R94200. The pair of the passive baluns can transmit analog/digital RF signals from an antenna placed in a suitable place via the existing UTP cable. The transmission is performed in parallel to the "normal" use of the cable for data transmission (LAN, Internet). The idea of using the Signal TV-LAN baluns is presented in the figure below.
Transmission of DVB-T and Ethernet signals over a single UTP cable with the use of R94200 baluns
Although the solution is based on point-to-point connection, it is possible to use multiple transmitter-receiver kits, even in combination with TV splitters and network switches. When the RF signal level after splitting is sufficient for further distribution, the signal can be sent over another UTP cable segment after a network switch, using TV splitter and additional pair of the baluns.
View of the balun (visible LAN and RF connectors)
Solutions based on the baluns are much more economical in comparison with deployment of additional systems based on coaxial cables or IPTV technology (the latter also requires extra network resources). They do not convert the original RF signals, only change the transmission medium.
Control of Hikvision IP cameras and NVRs via any web browser.
Hikvision IP cameras from EasyIP 2.0 plus, EasyIP 3.0 series and NVRs from I series can be upgraded with firmware allowing for access to the IP CCTV resources via any web browser, without using the WebComponents plugin. The firmware allows for using the latest versions of Chrome and Firefox, which do not support NPAPI (Netscape Plugin Application Programming Interface). The functionality is available after upgrading cameras to the firmware version 5.5.61 or higher and NVRs to the version 4.1.50 or higher. |  |
On the left - to view an image from an NVR with the older firmware it is necessary to install the appropriate plugin. On the right - the new firmware does not have such a requirement (in both cases - Chrome 69.0.3497.100.)
Parking function in rotary/PTZ cameras.
Rotary cameras are usually configured so that they automatically move along a specific route. The operator can define the pace of the movement, stopping points and periods along with zoom values (presets). Any moment the operator can switch to manual control. After such manual intervention, the operator can choose any automatic mode, but without any choice, some cameras turn on parking function (available in n-cam-870 camera and Hikvision rotary cameras, e.g. DS-2AE4225TI-D M75931, DS-2DE4225IW-DE K17912, DS-2DE7220IW-AE K1797).
N-CAM 870 M7486 HD-TVI PTZ camera has the parking function
The parking function ensures that after a prest period of inactivity the camera will perform a specific action. This may be a patrol, scanning or route, chosen from among previously pre-programmed actions. For example, the HD-TVI PTZ Hikvision M75931 camera has a "PARK TIME" inactivity period configurable from 5 to 720 seconds. To determine the action, the operator must configure the "PARK ACT" parameter, by selecting one of the available options: presets from 1 to 8, patterns from 1 to 5, patrols from 1 to 10, horizontal scan, vertical scan, panoramic scan, day mode, night mode. The parking function will not be activated after triggering a special camera preset, or during actions related to an external alarm event.
Twisted-pair cables - nomenclature.
Twisted-pair (balanced) cables are used to transmit signals in telecommunication systems and computer networks. Currently they are mainly used in analog telephony and Ethernet networks. Twisted-pair cables may consist of one or more pairs. The twisting strongly reduces the influence of external electromagnetic interference and mutual interference between the pairs, called crosstalk.![CAT 5e UTP Cable: NETSET BOX U/UTP 5e [305m] (indoor, Dca-s1,d2,a1)](https://static.dipol.com.pl/images/sk/pict/e1414_305++.jpg)
NETSET BOX U/UTP 5e indoor cable [305m] Dca-s1,d2,a1.
New item in the DIPOL's range of cables: E1414_305.
New item in the DIPOL's range of cables: E1414_305.
The xx and yy markings can be as follows:
- U – unshielded
- F – foiled (screened with foil)
- S – shielded (screened with braid)
- SF – shielded and foiled
- U/UTP – unscreened cable
- F/UTP – foil screened cable with unscreened balanced elements
- U/FTP – unscreened cable with foil screened balanced elements
- F/FTP – foil screened cable with foil screened balanced elements
- SF/UTP – overall braid and foil screened cable with unscreened balanced elements
- S/FTP – overall braid screened cable with foil screened balanced elements
- SF/FTP – overall braid and foil screened cable with foil screened balanced elements
LAN in two buildings located at a distance of 200 m.
The best way to create one LAN network in two buildings located at a distance of 200 meters is the application of fiber optic cable. The use of twisted pair cable over such a distance would not comply with applicable standards and would result in a significant reduction of the throughput of the LAN.In a situation where the buildings are already equipped with switches without SFP slots, the best and universal solution is the use of optical media converters. In each building the suitable media converter is connected via a UTP patch cord to one of the ports of the switch and changes the electrical signals into optical form and vice versa. Choosing the media converters, the user should consider the following parameters:
- data transfer rate - there are 100 Mbps or 1000 Mbps models,
- fiber type - designed for multimode or single-mode fibers,
- maximum transmission distance - we offer models with range of 550 m, 2000 m, 15 km or 20 km,
- communication method - there are models operating with two fibers or with one fiber (WDM).
An implementation of optical link in the case of 200-meter distance between buildings
 | IP PTZ Camera: Hikvision DS-2DE4225IW-DE K17912 has been equipped with high quality 2 MP (1920x1080) image sensor operating at 25 fps. The camera provides three independently configured data streams and can use several video compression methods: H.265+/H.265/H.264+/H.264/MJPEG. Thanks to day and night modes, the camera very well renders colors in daylight and fully makes use of its high sensitivity at night. The built-in IR illuminator with a range of up to 100 m has Smart IR function that protects against overexposure. The camera is also equipped with audio input for connecting an external microphone, and audio output for connecting an active (powered) loudspeaker. | |
 | Antenna Preamplifier: APL-104 (VHF/UHF, shielded) B4043 is designed for amplification of weak FM/DAB+ and DVB-T signals within 87-790 MHz frequency range. It can be used outdoors. The input and output impedance is 75 ohm - it means that antennas having 300 ohm impedance have to be equipped with a matching transformer e.g. C0001. The amplifier should be powered through the output (TV/12V) via the coaxial cable, from a 12 VDC power supply with RF/DC separator (also referred to as a DC injector). | |
 | HDMI to DVB-T (COFDM) Modulator Terra MHD001P R86103 is a multifunctional device that encodes and modulates the input HDMI signal with resolution up to Full HD (1920x1080-30p) into DVB-T COFDM RF channel. The modulator has HDMI input (with HDCP support), RF input (for optional RF loop), RF output, and 12 VDC input (DC jack inside F-like socket - not to be mistaken with the method of powering via coaxial cable). | |
Worth reading
Easy to deploy and cheap base station. Outdoor wireless base station TP-Link WBS510 N2356 operating in the 5 GHz band is an effective solution for building outdoor wireless networks. Thanks to a central management system, it is ideal for point-to-point and point-to-multipoint architectures. High performance combined with ease of use make the WBS510 a great choice for both business and and home applications... >>>more
An example application of the TP-Link WBS510 5GHz N2356 base station
