ITPEC FE Morning April 2021 Question 14
Which of the following is an appropriate description of USB 3.0?
Explanation
5 Gbit/s SuperSpeed — USB 3.0 is a serial interface that added the SuperSpeed mode to USB 2.0's 480 Mbit/s High Speed.
USB 3.0 keeps the USB 2.0 wires for backward compatibility and adds separate pairs for SuperSpeed at 5 Gbit/s. Like every USB version, it connects peripherals to one host controller in a tiered star.
Answer (b)
Why not others:
- •(a) — isochronous transfer for audio and video together with a broadcast mode describes IEEE 1394 (FireWire); USB has no broadcast
- •(c) — the serialized version of the ATA disk interface is Serial ATA
- •(d) — four pairs, 2 bits per clock on each and 1 Gbit/s at most is Gigabit Ethernet over twisted pair (1000BASE-T)
Key rule: Learn interfaces by their headline figures: USB 2.0 480 Mbit/s, USB 3.0 5 Gbit/s SuperSpeed, 1000BASE-T 1 Gbit/s over four pairs.
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