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    Monitoring RF Signal-to-Noise Ratio

    Signal-to-noise ratio (SNR) is a measure of the level of a desired signal against the level of background noise, measured in decibels (dB). Think of having a conversation in an empty restaurant where your signal (your voice) is clearly heard. Now, think of that same restaurant at noon, when the background noise (all other conversations) is at a peak. You will need to talk louder and lean closer to be heard at noon. In other words, you must increase your signal to overcome the background noise.

    Signal-to-noise ratio, along with the bandwidth and channel capacity of a communication channel, affects throughput (see Monitoring RF Throughput), especially video throughput.

    To view the signal-to-noise ratio on a radio 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. The Signal-to-Noise Ratio monitor becomes available only when you select a radio.

    4. Click the Monitor mode RF tab to view the four basic monitors for radios, which includes the Signal-to-Noise Ratio monitor.

      By default, the populated Signal-to-Noise Ratio monitor graph uses throughput that the selected object has experienced over the last hour.

    5. Optionally, change the timeframe covered by the monitor by selecting a different time from the list.
    6. Click Help (?) for help interpreting the throughput chart or see Signal-to-Noise Ratio Monitor.

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

    If you are using MSS version 8.0 or higher, you can try using Transmit beam-forming (TxBF) to improve your SNR values. TxBF is a technique that uses an array of transmitting antennas to send radio signals with adjusted magnitude and phase at each antenna to achieve a focused beam target to the receiver. TxBF can increase the Signal-to-Noise Ratio (SNR) at the receiver and improve performance. This feature is supported on the WLA532, WLA321, and WLA322, and is configured from the MSS CLI.

    Modified: 2016-09-29