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Monitoring RF Interference Sources on One Radio

Because the 2.4-GHz band includes radio transmissions from devices other than wireless networks, interference is a common problem. Network Director detects, classifies, and displays radio interference in several monitors. This topic describes monitoring the interference of one radio displayed in a pie chart.

Monitoring RF Radio Interference Sources

Procedure

To view a radio’s RF interference sources in a pie chart over a fixed period of time:

  1. Select Monitor Mode in the Network Director banner.
  2. Select any view from the View pane.
  3. Expand the wireless list in the View pane, then select a radio.

    The monitor mode RF tab becomes available when you select a radio.

  4. In the Tasks pane on the right, click Interference Sources.

    A pie chart is displayed with a breakdown of the interference sources detected on the selected radio.

  5. Optionally, change the timeframe covered by the monitor by selecting a different time from the list.
  6. Click Help (?) for information about the radio interference chart or see RF Interference Sources Pie Chart for a Radio.

Note: To change the polling interval for monitors, see Setting Up User and System Preferences.

RF Interference Sources Pie Chart for a Radio

The RF Interference Sources pie chart for a single radio reflects all devices that have interfered with the traffic of the radio selected in the View pane. Network Director tracks and monitors interference from these sources:

To track these interference devices, Network Director polls the access point’s controller at the standard interval. The categories with the largest sections of the pie cause the most radio interference.

You can perform the following actions on the pie chart:

Interference is frequently not a problem on wireless networks with light traffic, but as traffic becomes heavier, throughput and capacity decrease and other problems become apparent. RF interference can cause packet retransmission (see Monitoring the Percentage of RF Packet Retransmissions). Interference is also a security concern because jamming can bring down the network .

Ideally, interference retransmission does not cause more than 10% of the total number of packets sent. If your retransmission percentage is higher, you can try to lower it by:

For more information about wireless interference, see Understanding Wireless Interference .

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