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Yagi-Uda antennas - putting the theory into practice - tailor-made designs!
The Yagi-Uda or Yagi antenna is one of the most popular antenna designs. Despite a comparatively simple construction, it has a high gain, typically greater than 10 dBi. Yagi-Uda antennas can operate in the HF to UHF bands (3 MHz to 3 GHz), but often within a limited bandwidth around the center frequency.
Industrial switches - equipment for all conditions!
ULTIPOWER Ethernet industrial switches enable data transmission at rates of 10/100 Mbps or 1000 Mbps. Their RJ45 ports support auto-negotiation and Power over Ethernet (PoE) functions. The devices automatically discover PD devices (///Power Device///) compliant with IEEE 802.3af standard and supply power to 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. The switches have been equipped with optical converters or SFP slots for installing modules changing the transmission medium to fiber.
PoE - IEE 802.3af and IEE 802.3at
PoE (Power over Ethernet) is the name of a number of methods that allow for powering network devices through UTP/FTP cables. This way it is possible to power devices such as cameras, phones, switches, access points, etc.
What is DDNS (Dynamic Domain Name System)
and how to use it?
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.
Twisted-pair cables - nomenclature, standards, parameters
Twisted-pair 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.
Types of connectors in WLAN, GSM, 3G, LTE devices
The user of a wireless network device such as access point, wireless adapter, modem etc. who wants to buy an external antenna should know the type of the antenna connector used in the device. A multitude of solutions and slight differences in appearance mean that less experienced users can have great difficulty in choosing the antenna with a matching connector.
OpenWRT or how to maximize the capabilities of your router
Today, more and more consumer electronics devices have to be connected to the Internet. Without it, the functionality of a modern TV, stereo, home theater, or game console may be very limited. Home routers, so far used only to provide access to the Internet, often can be adapted to preform functions necessary for the requirements of the modern appliances.
Category 5 twisted pair - transmitting characteristics
Unshielded category 5 twisted pair cable (UTP CAT5) is used as the means of transmission in computer networks using Ethernet 10baseT and 100baseT standards. The cable consists of 4 pairs, its wires have 0.5 mm diameter (the version with cord, instead of single wires has 7 cords, 0.2 mm diameter each, and total diameter equal 0.6 mm). In practice, the cable is commonly used in CCTV applications, as it can be employed both to transmit video signal and power CCTV devices.
Use of coaxial cables and connectors in WLAN systems
The range of wireless link depends on many factors. The user has influence on some of them, others cannot be changed due to a specific environment. The length and quality of the 50 ohm cable linking the AP and antenna has significant influence on the WLAN range.
WLAN connectors
Most WLAN devices are equipped with SMA-RP connectors, whilst outdoor antennas are equipped with N-type connectors. Using H-155 cable, one needs to terminate it with SMA RP connector on one side, and adequate male or female N connector (depending on the antenna) on the other side.
Configuring TP-Link router using Windows 7 and connecting to the WiFi network without knowing the password
Configuring TP-Link router using Windows 7 and quick connection of a laptop running Windows 7 (or Vista) to a WiFi network, using QSS function.
Make the best choice for your network - TP-Link devices
How to select the best access point? How to select the best WiFi router? How to choose the most suitable switch?
Home and SOHO Wi-Fi networks - applications of TP-LINK 802.11n devices
The 802.11n standard allows transfer up to 300 Mbps and is ideal for transmitting multimedia such as video, audio, pictures, etc. The wireless transmission of a movie or music album can take much less time than sending the same files using Fast Ethernet cable. An important feature of 802.11n devices is compatibility with older standards. An 802.11n router can also cooperate with wireless adapters/cards using 802.11b and 802.11g standards.
How to forward router ports to view online video from a DVR?
The port forwarding enables redirection of Internet packets (TCP and UDP protocols mostly). Depending on the implementation and device used (e.g. router), the packets are forwarded to the default TCP and UDP ports of the local computer(s), or to other ports.
Wireless adapter installation
(demonstration card: TP-Link TL-WN551G - PCI)
Wireless adapter enables communication with Access Point via electromagnetic waves in 2.4 GHz (standards 802.11 b/g) or 5 GHz (standard 802.11a) band. To start the communication, the card has to be properly installed and configured in the computer. This article describes step by step how to establish wireless connection using PCI WLAN card TP-Link TL-WN551G N2970.
Configuration of ADSL routers
ADSL service (Asymmetric Digital Subscriber Line) is one of the most popular ways of getting Internet access, especially in the case of home users. To share the service among several computers one needs a router integrated with ADSL modem, which is connected directly to the telephone line (RJ11).
How to configure a router
Router connects two or more logical subnets, e.g. external network with Internet access (WAN) with local network (LAN), making a bridge for information exchange. Without proper configuration the connection would be impossible. In most cases, router acts as a specialized computer (replacing a standard computer) working in external network, with software and hardware tailored to the tasks of routing and forwarding. It allows to create own internal (local) network.
Access Point Modes (example device: TP-Link TL-WA500G)
Access Point is the device that connects a wireless network to a wired system, so it has at least two interfaces: wireless - WLAN, using 802.11 standard, and wired - LAN, using 802.3 standard.
Self-help book for WLAN installers/providers
WLAN (Wireless Local Area Network) is a radio technology which allows to build wireless data networks with satisfactory parameters and quite large ranges of operation at a comparatively low cost. Additional advantage of this technology is short time needed for its implementation.
To meet the needs of many people interested in building WLAN networks, we have decided to collect in one article a bit of theory and a lot of practical information on quick and effective implementation of wireless networks working in 2.4 GHz and 5 GHz bands (802.11).
WLAN - the indoor installations
If the network is to work in an office block, the biggest problem to solve is the existence of numerous walls and several floors, and therefore attenuation of signals by walls and ceilings. In the case the network is to be used in the whole building, there will be needed several access points.