Contents

View RF Coverage Heat Maps

To view the radio frequency (RF) coverage (also known as heat maps) for a location floor, select AP Coverage or Sensor Coverage from the Heat Map View icon.

  • AP Coverage View
  • Sensor Coverage View
  • AP Link Speed
  • AP Channel Coverage

The AP Coverage View enables you to view an 802.11 RF coverage map based on the dBm at each point on the layout. This information is useful to find out available the signal strength at each point.

The Sensor Coverage View enables you to view the detection and prevention zones of visibility for selected sensors. Detection range is the area over which sensors can reliably detect the wireless activity of devices operating at a power level greater than the value set in the Transmit Power slider. The Intrusion Detection Display Threshold determines the threshold for this range.

Prevention Range is the area over which sensors can prevent unauthorized wireless activity. The Intrusion Prevention Display Threshold determines the threshold for this range.

The AP Channel View enables you to view all the 802.11 channels available for connection at each point on the floor. It helps in preventing potential channel interference scenarios.

The AP Link Speed View enables you to view the maximum downlink rate with which a client at a particular point can connect to an AP on the floor.

To view a live RF coverage map for a location floor, Authorized APs and sensors must be placed on the location layout of the location floor.

View AP Coverage

To view AP coverage:

  1. Select Locations.
  2. From the location tree, select the location floor where you want to see the AP coverage view.
  3. Place devices on the location layout.
  4. Click the AP Coverage link under Heatmap Views.
  5. Select 802.11a if you want to view APs operating in 802.11a mode.
  6. Select 802.11b/g if you want to view APs operating in 802.11b/g mode.
  7. Select the appropriate resolution in Resolution.

View AP Coverage by RSSI Value

You can select the RSSI value to view the AP coverage provided by all authorized APs placed on the location map. It helps you understand the boundaries of RSSI coverage with different threshold values.

To view AP coverage by RSSI value:

  1. Select Locations.
  2. From the location tree, select the location floor where you want to see the AP coverage view.
  3. Place devices on the location layout.
  4. Click the AP Coverage link under Heatmap Views.
  5. Select 802.11a if you want to view APs operating in 802.11a mode.
  6. Select 802.11b/g if you want to view APs operating in 802.11b/g mode.
  7. Select the RSSI value check box and move the slider to the right or left to the required RSSI value.

The area covered by the AP for the selected RSSI is seen on the location map.

View Sensor Coverage

To view the sensor coverage view:

  1. Select Locations.
  2. From the location tree, select the location floor where you want to see the sensor coverage view.
  3. Place devices on the location layout.
  4. Click the Sensor Coverage link under Heatmap Views.
  5. Select 802.11a if you want to view APs operating in 802.11a mode.
  6. Select 802.11b/g if you want to view APs operating in 802.11b/g mode.
  7. Select the appropriate resolution in Resolution.
  8. Select Detection if you want to view the detection zone of visibility of the devices functioning as sensors.
  9. Select Prevention if you want to view the prevention zone of the devices functioning as sensors.
  10. Select the transmit power.

View AP Link Speed

To view AP link speed:

  1. Select Locations.
  2. From the location tree, select the location floor where you want to see the AP coverage view.
  3. Place the devices on the location layout if they are not already placed.
  4. Click the AP Link Speed link under Heatmap Views.
  5. Select 802.11a if you want to view APs operating in 802.11a mode.
  6. Select 802.11b/g if you want to view APs operating in 802.11b/g mode.
  7. Select the appropriate resolution in Resolution.

View AP Channel Coverage

To view AP channel coverage:

  1. Select Locations.
  2. From the location tree, select the location floor were you want to see the AP coverage view.
  3. Place the devices on the location layout.
  4. Click the AP Channel Coverage link under Heatmap Views.
  5. Select 802.11a if you want to view APs operating in 802.11a mode.
  6. Select 802.11b/g if you want to view APs operating in 802.11b/g mode.
  7. Select the appropriate resolution in Resolution.

Calibrate RF Views

Calibration helps to tune RF parameters to compare the AP and sensor predictions with the actual observations. You can view a graph of the Predicted vs. Observed Signal Strengths when you calibrate an RF view.

To improve predictions, you can fine tune the minimum signal decay exponent and maximum signal decay exponent.

Minimum signal decay exponent specifies the amount of signal loss that is acceptable for regions close to the transmitter (sensor). Maximum signal decay exponent specifies the amount of signal loss that is acceptable for regions away from the transmitter. Signal loss is directly proportional to the signal decay exponents.

The Predicted value curve should overlap the Observed value curve as much as possible.

When you change the Minimum Signal Decay exponent, Maximum Signal Decay exponent, Signal Decay Slope, and Signal Decay Inflectionoptions, the RF view and location tracking for unobstructed regions is affected. In the obstructed regions, only Location Tracking is affected and the RF view is not affected. When you calibrate manually, the graph is automatically updated.

To calibrate RF views automatically:

  1. Select Locations.
  2. From the location tree, select the location where you want to calibrate RF views.
  3. Generate the RF Coverage/Heatmap.
  4. Click the Calibration link.
  5. To calibrate automatically, click Calibrate under Automatic Calibration.
    The graph is updated when you click Calibrate.
  6. To calibrate manually, change the values of the Signal Decay Slope and the Signal Decay Inflection.
    Wi-Fi Cloud uses these parameters when computing the RF and defines the region around the transmitter that is unobstructed.
  7. Adjust the confidence.
  8. Click OK or Apply to complete calibration if you have adjusted the parameters manually such that the two curves are parallel (but not coinciding).

You can change the intrusion detection display threshold and the intrusion prevention display threshold from Configuration > System > Advanced Settings > Live RF View Settings.

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