USB 3.2 Signal Propagation Delay Limits: 30 ns Maximum

The maximum total one-way signal propagation delay allowed in USB 3.2 is 30 ns. The allocation for cable delay is 26 ns. A maximum delay of 3 ns is allowed from a Host or Hub Controller downstream facing transceiver to its exterior downstream facing connector, while a maximum delay of 1 ns is allowed from the upstream facing connector to the upstream facing transceiver of any device. For a standard USB detachable cable, the cable delay is measured from the Series A connector pins to the Series B connector pins and is no more than 26 ns. For other cables, the delay is measured from the Series A connector to the point where the cable is connected to the device. The cable delay must also be less than 5.2 ns per meter. This information comes from the USB 3.2 specification.