B11 User Guide
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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?
Backhaul FAQ: What's a good EVM?