Sample outputs: 0c:00.0 Network controller: Intel Corporation Ultimate N WiFi Link 5300 $ lspci | egrep -i -color 'wifi|wlan|wireless' Type the following commands to list installed wireless card using combination of lspci command and grep command/ egrep command, enter: Find out your Linux wireless card chipset information To see the speed of WLAN interface, one can use iwconfig/iw command, cat command, and 3rd party apps. This page shows how to find the speed of the network interface using various commands on Linux. This will cause signal interference between them.Ī careful and thorough evaluation of your security requirements will help a great deal in identifying the prudence of using a wireless surveillance system.Linux Commands: To Find Out Wireless Network Speed and Other Info Do not keep the cameras too close to each other (The camera radio may automatically turn down its transmit output power which may result in connection loss Do not keep the cameras too close to the WAP (Try not to place the cameras near sources of heat or under the sun.It is best placed high on the wall or nearer to the roof (to avoid all kinds of obstacles like furniture, cubicles, etc.) Once again, do not place the wireless IP Cameras at a low level.Especially if the same SSID is used on both. Do not operate multiple WAPs in close proximity (Try not to place the WAP near sources of heat or under the sun.We would recommend it to be mounted close to the ceiling For example, in an office environment, keep the WAP above the height of all the cubicles. Even if it means overruling the earlier point. As far as possible, keep the WAP above all sources of obstruction.In other words, keep it in the middle of the room or desired area of coverage If possible, try placing the WAP at a location equidistant from all the walls of the room. Do not keep the Access Point device at a low level on the floor.Trees are notorious for absorbing signal energy.A high concentration of human bodies can attenuate the RF signal due to absorption.Weather events such as rain, snow, and even wind can wreak havoc with wireless signals.Anytime a type of antenna that is not recommended by the manufacturer is added, do keep in mind that the signal may be getting a boost beyond the legal limits of the country. Do check the manufacturer’s recommendations. A long hallway or corridor will most likely need an indoor semi-directional antenna for coverage as opposed to an omni-directional antenna.Keep the antennas straight pointing to the sky unless told to do otherwise.In addition to the above, keep the following points in mind while installing a wireless surveillance solution: Potential sources of interference in the 5GHz UNII bands include the following:Ī basic wireless surveillance set-up normally consists of the wireless IP cameras, the Wireless Access Point (WAP) and the Network Video Recorder (NVR) or the media server. Wireless Internet Service Providers (WISPs).Potential sources of interference in the 2.4GHz ISM band: Existing previously installed 802.11 networks can also cause interference. The two most common sources of wireless network interference are wireless telephones and microwave ovens. Interference can slow down a network significantly and reduce its range as well. The 802.11 wireless standards communicate in the 2.4, 3.6 and 5 GHz frequency bands. The other thing to check for is potential interference with the Wi-Fi network’s frequency range. So if you have tinted glasses anywhere between WAP and the camera, you can expect a drop in signal strength. Tinted glass panes carry metal constituents.When placing an IP camera make sure the elevator does not come between the camera and the Wireless Access Point Elevators block Wi-Fi signals to a great extent.If the walls are made of non-porous materials, your wireless connection may have a shorter range or a slower speed.Therefore, wireless surveillance solutions do not guarantee connectivity between floors of buildings and between thick reinforced concrete walls The following facts should therefore be kept in mind: However, materials such as brick, plaster, cement, metal, stone, and double-glazed glass may cause problems. Materials such as drywall, plywood, other kinds of wood and glass can be easily penetrated by wireless signals. However, in reality, some walls are thicker or use reinforced concrete and may block some of the signals. In theory, Wi-Fi signals are capable of passing through walls and other obstacles relatively easily. The first thing to do is to check the construction of the walls. It is very important to be aware of these impediments and see how they could affect the installation, before going in for a wireless solution. While installing Wi-fi solutions, a user may come up with a few impediments specifically w.r.t the range and reception.
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