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Appendix D Wireless LANs
VMG1312-B Series User’s Guide
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2.5% . For an unobst ruct ed out door sit e, each 1dB increase in gain result s in a range increase of
approxim at ely 5% . Act ual result s m ay vary depending on t he net work environm ent .
Ant enna gain is som et im es specified in dBi, which is how m uch t he ant enna increases t he signal
power com pared t o using an isot ropic ant enna. An isot ropic ant enna is a t heoret ical perfect ant enna
t hat sends out radio signals equally well in all direct ions. dBi represent s t he t rue gain t hat t he
ant enna provides.
Types of Antennas for WLAN
There are t wo t ypes of ant ennas used for wireless LAN applicat ions.
• Om ni- direct ional ant ennas send t he RF signal out in all direct ions on a horizont al plane. The
coverage area is t orus- shaped ( like a donut ) which m akes t hese ant ennas ideal for a room
environm ent . Wit h a wide coverage area, it is possible t o m ake circular overlapping coverage
areas wit h m ult iple access point s.
• Direct ional ant ennas concent rat e t he RF signal in a beam , like a flashlight does wit h t he light
from it s bulb. The angle of t he beam det erm ines t he widt h of t he coverage pat t ern. Angles
t ypically range from 20 degrees ( very direct ional) t o 120 degrees ( less direct ional) . Direct ional
ant ennas are ideal for hallways and out door point- t o- point applicat ions.
Positioning Antennas
I n general, ant ennas should be m ount ed as high as pract ically possible and free of obst ruct ions. I n
point- t o–point applicat ion, posit ion bot h ant ennas at t he sam e height and in a direct line of sight t o
each ot her t o at t ain t he best perform ance.
For om ni- direct ional ant ennas m ount ed on a t able, desk, and so on, point t he ant enna up. For
om ni- direct ional ant ennas m ount ed on a wall or ceiling, point t he ant enna down. For a single AP
applicat ion, place om ni- direct ional ant ennas as close t o t he cent er of t he coverage area as possible.
For direct ional ant ennas, point t he ant enna in t he direct ion of t he desired coverage area.
Summary of Contents for VMG1312-B Series
Page 4: ...Contents Overview VMG1312 B Series User s Guide 4 Troubleshooting 289 ...
Page 14: ...Table of Contents VMG1312 B Series User s Guide 14 ...
Page 15: ...15 PART I User s Guide ...
Page 16: ...16 ...
Page 30: ...Chapter 2 The Web Configurator VMG1312 B Series User s Guide 30 ...
Page 35: ...Chapter 4 Tutorials VMG1312 B Series User s Guide 35 7 Click Apply to save your settings ...
Page 77: ...77 PART II Technical Reference ...
Page 78: ...78 ...
Page 166: ...Chapter 9 Routing VMG1312 B Series User s Guide 166 ...
Page 184: ...Chapter 10 Quality of Service QoS VMG1312 B Series User s Guide 184 ...
Page 210: ...Chapter 13 Interface Group VMG1312 B Series User s Guide 210 ...
Page 226: ...Chapter 15 Firewall VMG1312 B Series User s Guide 226 ...
Page 232: ...Chapter 17 Parental Control VMG1312 B Series User s Guide 232 ...
Page 242: ...Chapter 19 Certificates VMG1312 B Series User s Guide 242 ...
Page 246: ...Chapter 20 Log VMG1312 B Series User s Guide 246 ...
Page 250: ...Chapter 21 Traffic Status VMG1312 B Series User s Guide 250 ...
Page 256: ...Chapter 24 IGMP Status VMG1312 B Series User s Guide 256 ...
Page 260: ...Chapter 25 xDSL Statistics VMG1312 B Series User s Guide 260 ...
Page 262: ...Chapter 26 User Account VMG1312 B Series User s Guide 262 ...
Page 268: ...Chapter 29 TR 064 VMG1312 B Series User s Guide 268 ...
Page 272: ...Chapter 30 Time Settings VMG1312 B Series User s Guide 272 ...
Page 278: ...Chapter 32 Logs Setting VMG1312 B Series User s Guide 278 ...
Page 296: ...Chapter 36 Troubleshooting VMG1312 B Series User s Guide 296 ...
Page 336: ...Appendix C Pop up Windows JavaScripts and Java Permissions VMG1312 B Series User s Guide 336 ...
Page 350: ...Appendix D Wireless LANs VMG1312 B Series User s Guide 350 ...
Page 374: ...VMG1312 B Series User s Guide 374 Index ...