Mimosa Backhaul Help Content
Mimosa Backhaul Single Client (PTP) Mode
Copyright © 2014 Mimosa Page 105
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
conditions (i.e. interference) causes PER to increase. PER and MCS are inversely correlated meaning that as PER
increases, MCS decreases and vice versa.
Single channel mode usually uses 2 streams, but may drop to one stream if RF conditions are poor. Dual channel
mode uses up to 4 streams. You may also see the number of streams change periodically because of tests that
Rate Adaptation performs to optimize performance. This is expected and normal.
Related:
Backhaul FAQ: What SNR is required for each MCS?
Backhaul FAQ: What is the sensitivity for each MCS index?
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