site survey ucsc -engineering 2 linda rosewood – lynne sheehan – bob vitale equipment: winxp...
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Site Survey UCSC -Engineering 2
Linda Rosewood – Lynne Sheehan – Bob Vitale
Equipment: WinXP Laptop with NetstumblerMacOSX Laptop with KisMACCisco 1200 AP with two types of antennas
1. Compare 802.11b/g coverage using 2.2dBi “duck” and 5.2dBi ceiling mount antennas.
2. Investigate interesting propagation effects-through walls, windows, between floors, down corridors.
3. Map a coverage area for the 2nd floor using APs positioned in the corridor and positioned in a lab. Do the results help determine AP placement for building?
Objective: Learn About & Understand Propagation in the Engineering 2 Building
South Corridor Note “decorative” metal ceiling tiles
2nd Floor Survey Areas
Faculty offices
Labs
Academic Support
Conferenceroom
Conference room
Loc #2: Rear Corridor Ceiling, AP above 5.5dBi antennas hang below
Loc #1: Inside Lab, survey done with 2.2dBi “ducks” and 5.5dBi ceiling mount omnis
Ducks vs. Ceiling Mount Omni
5.5dBi Suspended Ceiling Mount Omni- Directional AntennasCisco AIR-ANT1728Cost: $105 each
2.2dBi Rubber Duck AntennasCisco AIR-ANT4941Cost: $15 each
9
11131412
1615
64
7
5
108
3 2
E2 2nd Floor West Survey – Rubber Duck vs. Ceiling Mt Omni
See Next Slide for values, most points Omnis beat ducks by 1 to 6 dB, average 3dB improvement
Hidden Area behind elevators
Hidden Area behind ducts/walls
RubberDuck
Ceiling Mount Omni Diff
Location# Name Average STDEV Average STDEV + = om
1Room 208
3 feet from AP 63 7 61 10 -2
2Outside Rm 208
Main Cooridor 49 7 54 5 5
3Bench 1
Outside Rm 210 49 6 54 5 5
4Bench 2
Outside Rm 215 33 5 37 9 3
5Room 216
cube close to AP 32 3 35 4 2
6Room 216
cube furtherest away 31 4 33 4 2
7Room 215
card towards AP 22 4 23 5 2
8Room 215
card away from AP 19 2 19 3 1
9
Room206Card pointed SouthA/C Unit between AP/Card 49 4 54 3 4
10Room 205
cube closest to windows 39 4 45 2 6
11Hall behind
Room 208 53 10 59 7 6
12Room 237B
Office w/Door closed 45 3 49 3 4
13 Interactive Space 48 3 49 8 1
14Benches outside
E2-219 21 4 25 6 4
15Room 201
Last Cubicle on Windows 37 3 42 5 5
16Cowboy Chairs
2nd Chair in 20 6 18 3 -2
17Room 308
Immediately above AP 16 2 16 3 0
Compare Propagation: Glass vs. Free Space
0
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70
80
1 13 25 37 49 61 73 85 97 109 121 133 145 157 169 181 193 205 217 229 241 253 265 277 289 301 313 325 337 349 361 373 385 397 409 421 433 445 457
Data Points
Sig
na
l:N
ois
e
Free Space (10ft) IndoorGlass Window (10ft)Free Space (10ft) Outside
Average Loss due to GlassUsing Indoor Free Space Measurement: 19dB
Using Outdoor Free Space Measurement: 24dB
Compare Propagation: Metal Stud Wall vs. Free Space
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70
80
1 7 13 19 25 31 37 43 49 55 61 67 73 79 85 91 97 103 109 115 121 127 133 139 145 151 157 163 169 175 181 187 193 199 205 211
Data Points
Sig
nal
:No
ise
Indoor Free Space (5ft total dist)
With Wall Insert (5ft total dist)
Average Loss due to Metal Stud WallUsing Indoor Free Space Measurement: 3dB
Glass Corridor vs Free Space Outdoor PropagationDistance on both is 173 feet
0
10
20
30
40
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60
1 29 57 85 113 141 169 197 225 253 281 309 337 365 393 421 449 477 505 533 561 589
Data Point
Sig
nal
:No
ise
Free Space - Outdoor (173ft)
Glass Corridor
Data FreeSpace Glass CorridorAverage 35 39Std Dev 5 15Max 44 51Min 11 0