B11 User Guide
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better (e.g. -90 dBm is better than -80 dBm). Noise sources can be either in close proximity to the local radio, or
they can be remote transmitters pointed back at the local radio.
The signal-to-noise ratio (SNR) is the difference between the Rx Power and Rx Noise, and is a measure of how well
the local receiver can detect signals from the remote transmitter and clearly discern them from noise. Higher
values are better (e.g. 30 dB is better than 10 dB).
If two channels are selected, you may observe that SNR is much lower on one channel than the other. This could be
because the Tx Power is set lower on the remote transmitter, or because of higher interference levels on the
channel. To resolve this, increase Tx Power or change the channel that has lower SNR.
Chains 1 & 3 have horizontal polarization, and Chains 2 & 4 have vertical polarization. Chains with the same
polarization are combined internal to the radio before exiting to the antenna connectors.
Streams
The Streams table contains the Tx MCS index, Tx PHY rate, Rx MCS index, Rx PHY rate, and the Rx EVM for each
stream.
The Tx MCS is an indicator of how well the remote radio can receive data from the local transmitter. The Rx MCS
indicates how well the local radio is receiving data from the remote transmitter.
The Modulation Coding Scheme (MCS) represents how much data can be sent at a time, so directly affects
The Modulation Coding Scheme (MCS) represents how much data can be sent at a time, so directly affects
potential throughput represented by the PHY rate. The higher the MCS index (ranging from 0-9), the more
potential throughput represented by the PHY rate. The higher the MCS index (ranging from 0-9), the more
data that can be sent per transmission. A disadvantages of higher MCS indices is that they require higher
data that can be sent per transmission. A disadvantages of higher MCS indices is that they require higher
SNR since they are more vulnerable to noise.
SNR since they are more vulnerable to noise.
The Error Vector Magnitude (EVM) indicates the difference between the actual and expected amplitude and phase of
an incoming signal. Smaller values are better (e.g. -30 dB is better than -10 dB).
Rate Adaptation dynamically adjusts both the MCS and the number of streams depending on RF conditions. Poor RF
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