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Why throughput testing matters Throughput is the number operators, vendors and customers all ask about first. It is also one of the hardest to measure well. A speed-test app tells you what one phone saw at one moment. It doesn’t tell you what the radio, transport and core can sustain, or where the bottleneck is. RAN and core engineers need controlled, repeatable traffic with a known offered load, direction, packet size and duration. That is how they validate a new cell, compa