Mimosa Backhaul Help Content
Mimosa Backhaul Single Client (PTP) Mode
Copyright © 2014 Mimosa Page 104
Reading MIMO Status Tables
The MIMO Status panel contains two tables: Chains and Streams. Chains represent the physical medium (RF Tx/Rx
values), while Streams represent data. Chains and Streams are not necessarily correlated one to one because the
Rate Adaptation algorithm may periodically increase or decrease the number of data streams sent over the physical
medium when reacting to interference.
The Chains table describes each chain's power, noise, SNR, frequency and polarization.
The Streams table describes each stream's MCS index, PHY rates and Rx Error Vector Magnitude (EVM).
Each table can be selected by clicking on the navigation circles at the bottom of the panel.
Chains
The Chains table contains 6 values: Tx Power, Rx Power, Rx Noise, SNR, Center Frequency and Polarization. Each
channel is assigned two chains (horizontal and vertical). If two channels are selected, Channel 1 uses Chains 1 & 2,
while Channel 2 uses Chains 3 & 4.
Tx Power is the amount of power applied to each of the MIMO chains.
Tx Power can be shared evenly (preferred), or unevenly (if necessary), between channels. The Tx power
Tx Power can be shared evenly (preferred), or unevenly (if necessary), between channels. The Tx power
per channel is divided evenly per chain. Example: 4 dBm Tx power on Channel 1 results in 1 dBm each on
per channel is divided evenly per chain. Example: 4 dBm Tx power on Channel 1 results in 1 dBm each on
Chains 1 & 2.
Chains 1 & 2.
Rx Power is the incoming signal level from the remote radio. Larger values are better (e.g. -50 dBm is better than -
60 dBm).
Rx Noise is a combination of the thermal noise floor plus interference detected by the local radio. Smaller values are
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
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