Cisco Cisco Aironet 3500e Access Point 백서
Copyright © 2010 Miercom
Cisco CleanAir Competitive
Page 11
modes; in Interference Scan mode, the closest AP to the source did not detect, and the two
sensors misclassified the source as Bluetooth.
sensors misclassified the source as Bluetooth.
Cisco correctly classified and mapped the physical locations of each phone in relation to the
access points.
access points.
Bluetooth is low duty cycle - 1% interference - when in Discovery mode. A Bluetooth headset
was put into the test environment to ascertain if Cisco or Motorola could detect it. Neither Cisco
nor Motorola were able detect the device since Bluetooth discovery only occurs for a very brief
period of time. With the Bluetooth headset active, the duty cycle was 15%. Motorola detected
the interference intermittently on one sensor, but not on the access point closest to the
interference source. Since Motorola does not assign a unique ID to each interferer, it was listed
as the misclassified Bluetooth from the previous cordless phone test. The alarm showed the
start time from the previous test, but not when it ended. The Bluetooth alarm was also assigned
the same severity level as continuous wave, even though the real-world impact of these two
types of interference are different.
was put into the test environment to ascertain if Cisco or Motorola could detect it. Neither Cisco
nor Motorola were able detect the device since Bluetooth discovery only occurs for a very brief
period of time. With the Bluetooth headset active, the duty cycle was 15%. Motorola detected
the interference intermittently on one sensor, but not on the access point closest to the
interference source. Since Motorola does not assign a unique ID to each interferer, it was listed
as the misclassified Bluetooth from the previous cordless phone test. The alarm showed the
start time from the previous test, but not when it ended. The Bluetooth alarm was also assigned
the same severity level as continuous wave, even though the real-world impact of these two
types of interference are different.
Cisco detected and correctly classified this Bluetooth device as a unique interferer, displayed
the location on a floor plan of the environment, and displayed the severity.
the location on a floor plan of the environment, and displayed the severity.
Screen shot from Motorola
In the test case using multiple simultaneous interference sources, Motorola did detect the
microwave oven and the video camera but it missed the DECT phone and Bluetooth sources,
which are both frequency hoppers. Note that multiple alarms were triggered even though only
one microwave was on.
microwave oven and the video camera but it missed the DECT phone and Bluetooth sources,
which are both frequency hoppers. Note that multiple alarms were triggered even though only
one microwave was on.