Cisco Cisco Aironet 3500i Access Point Libro blanco
Copyright © 2010 Miercom
Cisco CleanAir Competitive
Page 8
Figure 2: 2.4GHz Baseline Measurement with Impact of Interference on Throughput
Comparing the baseline with interference from Bluetooth, Cordless Phone, Microwave and
Video Camera. Each non-Wi-Fi interferer has different effects and was tested individually and
compared to the baseline.
Video Camera. Each non-Wi-Fi interferer has different effects and was tested individually and
compared to the baseline.
Interference on the 2.4GHz Wi-Fi band was then tested. This band consists of channels 1, 6
and 11. The baseline on a clean spectrum was 88.849 Mbps. When a Bluetooth headset was
active, transmitting voice, throughput dropped to 76 Mbps. Bluetooth is also a frequency
hopping type of interference.
and 11. The baseline on a clean spectrum was 88.849 Mbps. When a Bluetooth headset was
active, transmitting voice, throughput dropped to 76 Mbps. Bluetooth is also a frequency
hopping type of interference.
We used 2.4GHz cordless phones to record the signaling impact of frequency hopping. We
used three phones: two were conferenced, and one was the base station connected to a
landline. With three phones in use, network throughput dropped to 57 Mbps.
used three phones: two were conferenced, and one was the base station connected to a
landline. With three phones in use, network throughput dropped to 57 Mbps.
Cyclic type of interference is created by microwave ovens and affects channels in the upper
portion of 2.4GHz including 6 through 11 depending on the model. With the oven set for two
minutes on high power, network throughput was reduced to 50 Mbps. See
portion of 2.4GHz including 6 through 11 depending on the model. With the oven set for two
minutes on high power, network throughput was reduced to 50 Mbps. See
Figure 2
for the
2.4GHz baseline values.
When a 2.4GHz band wireless video surveillance camera was engaged, 0 Mbps throughput
was noted.
When a 2.4GHz band wireless video surveillance camera was engaged, 0 Mbps throughput
was noted.
88.8
75.9
56.6
49.6
0.0
0.0
10.0
20.0
30.0
40.0
50.0
60.0
70.0
80.0
90.0
100.0
2.4GHz
Baseline
Bluetooth
Cordless
Phone
Microwave
Oven
Video
Camera
TC
P Thr
oughput
(
M
bps)