View
The selection and use of access point antenna equipment affect network performance and availability. The signal strength or the amount of energy radiated by an antenna has to do with the type of antenna and access point data transfer. It is expressed as the effective isotropic radiated power (EIRP) and expressed as the sum of the access point to transmit power plus antenna gain less loss of the cable. Length can be increased or reduced signal lossand should be minimized. Each antenna type is specified, a bandwidth of horizontal and vertical. The antenna gain, cable length, number and installation of all key design. For example, high-gain directional antenna, no external cables, mounted at the correct height will give the best performance in an external application with many disorders.
Wireless Network Bridge
The cellular coverage inside the implementations with external antennas that plug-in connections are extended toAccess points. Most antennas can be mounted on the ceiling or wall and outside antennas often use a tree at the line of sight to increase.
Isotropic radiated power = Output power (dBm) + Gain (dB) - Cable (dB)
Omni-directional
Omnidirectional antenna transmits a radiated pattern of 360 degrees horizontal and vertical pattern from 50 to 70 degrees from the source. From a practical point of view, the reason is not circular aselliptical. This is a multi-homing antenna signals for multiple customers in the vicinity causing some multipath fading, which is minimized with antenna diversity. The gain values at 2.4 GHz 2.2 dBi antenna - 12 dBi. The antenna gain is higher for most in use. Some Cisco access points have an integrated omni-directional dipole antenna or "Rubber Ducky" by default on any device.
Directional
The directional antenna sends adirected radiated pattern of connection to an antenna at a distance. The antenna is used for traffic between the antennas used to send and not for multi-homing device. There are 3 special directional antennas: Yagi, Patch and flat. The parabolic antenna has high gain and a narrower angle beam at gain of patch antenna is the lowest and widest range irradiated. The values of gain at 2.4 GHz 6 dBi antenna - 21 dBi. Most antennas are made in this group of buildings there are a lot of signalAttenuation as the production, storage and facilities with lots of steel, concrete, angular forms, etc.
Diversity
The antenna implement dual antenna Diversity Access Point to the signals received at both. The access point determines the gain antenna and transmits this antenna is better. Diversity omni-directional antennas are either on, or dipole-directional styles. Multipath fading occurs in buildings that have a lot of signal reflections.The signal takes multiple paths from source to destination and distort the signal to the receiver. This is minimized or eliminated with antenna diversity.
External Antenna
Some access points such as Cisco 1200-series have a connector for an external antenna. This is with installations in environments where the access point is a maximum of 300 meters from the switch wired or signal distortion is too high. The external antenna coax someCables from 3 to 100 meters with antenna placement to allow optimal positioning. Minimize the length of the cable to reduce signal attenuation prior to transmission. The implementation of the higher gain antenna patch addresses the problem of the diversity of customers out of reach. The company has a repeater as a substitute with a 1100 series access point, which they used without an external antenna.
Building materials and construction contribute to signal attenuation. TheIt is described below, used building materials from best to worst with walls, floors and ceilings. With several feet of steel and concrete is the hardest.
• Wood
• Concrete
• Reinforced concrete
• Steel
Antenna mounting
19 meters in height to optimize the width of the beam horizontally and vertically - access points should be mounted on the ceiling, if possible, have 17 or more. In some cases, access points must be mounted onWall. The installation of the antenna is important and should be implemented with the instructions in the Hardware Installation Guide. Cisco access points using the standard RP-TNC connectors 50 ohms.
Out of the mounting bracket
The companies have implemented a set of Cisco wireless bridges, buildings in a campus network. The view may be present or to use a repeater to extend the network, where it is notavailable. External antennas are interested in environmental issues and longer distances, requiring more directional antennas. The assembly is usually a tree or flat against a wall. Distances can be extended to about 250 to 500 meters or even more power bridges far superior, professional antenna installation and use of repeaters.
Point-to-point topology is a set with an external wireless installations implemented. Point-to-multipoint topology is implemented with internal and externalWireless deployments. Root bridge or root access point is in a multi-homed topology with traffic from multiple non-root bridge or access point. The topology with multiple buildings and spoke to a hub or a central office, which must be implemented outside the network. The agencies have said is a point to point connection to the home hub and the hub office multipoint connection with all office that point. The office hub will implement an omnidirectional antenna with aBeam width while the spoken many offices use a directional antenna.
The interior design of the default access point are not a group of directional antennas. To implement most of the use of omnidirectional antennas and directional antennas where necessary as a means to overcome distances. The exterior of implementations in many cases means more distance and environmental concerns to make an effective selection directional antennas.
Wireless Network Antenna - The basics of selecting the antennawireless network bridge