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USB · shared bandwidth planner

Budget the hub’s one upstream pool.

Add simultaneous device traffic without assuming that every downstream port has a private link.

Concurrent workload

Visible assumption, not universal efficiency

Use simultaneous demand, not device labels

An SSD advertised at 10 Gbps does not constantly consume 10 Gbps. Enter a defensible workload budget for devices active at the same time, keep the planning share explicit, then test the real workload.

One data pool per run. A conventional USB 3.x hub has separate USB 2.0 and SuperSpeed paths. Group devices by their actual shared path; do not charge USB 2.0 traffic against a SuperSpeed pool. A USB4/Thunderbolt headline rate is not automatically a dedicated USB pool.

For decimal MB/s, multiply by 8 and divide by 1,000: 400 MB/s is 3.2 Gbps. MiB/s is a different unit. The planning share is your assumption, not measured efficiency. This aggregate screen does not model directional scheduling or guarantee throughput or latency.

Power is separate: external hub power does not increase upstream bandwidth. Use the Hub Power Budget Planner for supply limits, and the worked example and controlled test sequence before combining devices.

Check each device path · Read the shared-bandwidth guide