Appendix D Wireless LANs
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2.5%. For an unobstructed outdoor site, each 1dB increase in gain results in a range increase of
approximately 5%. Actual results may vary depending on the network environment.
Antenna gain is sometimes specified in dBi, which is how much the antenna increases the signal
power compared to using an isotropic antenna. An isotropic antenna is a theoretical perfect antenna
that sends out radio signals equally well in all directions. dBi represents the true gain that the
antenna provides.
Types of Antennas for WLAN
There are two types of antennas used for wireless LAN applications.
• Omni-directional antennas send the RF signal out in all directions on a horizontal plane. The
coverage area is torus-shaped (like a donut) which makes these antennas ideal for a room
environment. With a wide coverage area, it is possible to make circular overlapping coverage
areas with multiple access points.
• Directional antennas concentrate the RF signal in a beam, like a flashlight does with the light
from its bulb. The angle of the beam determines the width of the coverage pattern. Angles
typically range from 20 degrees (very directional) to 120 degrees (less directional). Directional
antennas are ideal for hallways and outdoor point-to-point applications.
Positioning Antennas
In general, antennas should be mounted as high as practically possible and free of obstructions. In
point-to–point application, position both antennas at the same height and in a direct line of sight to
each other to attain the best performance.
For omni-directional antennas mounted on a table, desk, and so on, point the antenna up. For
omni-directional antennas mounted on a wall or ceiling, point the antenna down. For a single AP
application, place omni-directional antennas as close to the center of the coverage area as possible.
For directional antennas, point the antenna in the direction of the desired coverage area.
Содержание VWG1312-B10A
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Страница 8: ...Contents Overview VMG1312 B10A User s Guide 8 Troubleshooting 291 ...
Страница 18: ...Table of Contents VMG1312 B10A User s Guide 18 ...
Страница 19: ...19 PART I User s Guide ...
Страница 20: ...20 ...
Страница 34: ...Chapter 2 The Web Configurator VMG1312 B10A User s Guide 34 ...
Страница 39: ...Chapter 4 Tutorials VMG1312 B10A User s Guide 39 7 Click Apply to save your settings ...
Страница 79: ...79 PART II Technical Reference ...
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Страница 168: ...Chapter 9 Routing VMG1312 B10A User s Guide 168 ...
Страница 186: ...Chapter 10 Quality of Service QoS VMG1312 B10A User s Guide 186 ...
Страница 212: ...Chapter 13 Interface Group VMG1312 B10A User s Guide 212 ...
Страница 228: ...Chapter 15 Firewall VMG1312 B10A User s Guide 228 ...
Страница 234: ...Chapter 17 Parental Control VMG1312 B10A User s Guide 234 ...
Страница 244: ...Chapter 19 Certificates VMG1312 B10A User s Guide 244 ...
Страница 248: ...Chapter 20 Log VMG1312 B10A User s Guide 248 ...
Страница 252: ...Chapter 21 Traffic Status VMG1312 B10A User s Guide 252 ...
Страница 258: ...Chapter 24 IGMP Status VMG1312 B10A User s Guide 258 ...
Страница 262: ...Chapter 25 xDSL Statistics VMG1312 B10A User s Guide 262 ...
Страница 264: ...Chapter 26 User Account VMG1312 B10A User s Guide 264 ...
Страница 270: ...Chapter 29 TR 064 VMG1312 B10A User s Guide 270 ...
Страница 274: ...Chapter 30 Time Settings VMG1312 B10A User s Guide 274 ...
Страница 280: ...Chapter 32 Logs Setting VMG1312 B10A User s Guide 280 ...
Страница 298: ...Chapter 36 Troubleshooting VMG1312 B10A User s Guide 298 ...
Страница 338: ...Appendix C Pop up Windows JavaScripts and Java Permissions VMG1312 B10A User s Guide 338 ...
Страница 352: ...Appendix D Wireless LANs VMG1312 B10A User s Guide 352 ...
Страница 368: ...Appendix G Legal Information VMG1312 B10A User s Guide 368 ...
Страница 376: ...VMG1312 B10A User s Guide 376 Index ...
Страница 377: ...Index VMG1312 B10A User s Guide 377 ...
Страница 378: ...VMG1312 B10A User s Guide 378 Index ...