question: When does a USB 2.0 hub operate in high speed mode ?
answer: When a high-speed USB 2.0 hub is plugged into a high-speed USB host or hub
turker_answer: A USB 2.0 hub operates in high speed mode when it is plugged into a high speed USB host or hub .
rule-based: A USB 2.0 hub operates in high speed mode in when a high-speed USB 2.0 hub is plugged into a high-speed USB host or hub .