ITPEC FE Morning October 2018 Question 13
Which of the following is an appropriate explanation of USB 3.0?
Explanation
5 Gbps SuperSpeed — USB 3.0 is a serial interface that added the SuperSpeed mode to USB 2.0's 480 Mbps High Speed.
USB 3.0 keeps the USB 2.0 wires for backward compatibility and adds separate pairs for SuperSpeed at 5 Gbps. Like every USB version, it connects peripherals to one host controller in a tiered star.
Answer (a)
Why not others:
- •(b) — isochronous transfer for audio and video together with a broadcast mode describes IEEE 1394 (FireWire); USB has no broadcast
- •(c) — four pairs, 2 bits per clock on each and 1 Gbps at most is Gigabit Ethernet over twisted pair (1000BASE-T)
- •(d) — the serialized version of the ATA disk interface is Serial ATA
Key rule: Learn interfaces by their headline figures: USB 2.0 480 Mbps, USB 3.0 5 Gbps SuperSpeed, 1000BASE-T 1 Gbps over four pairs.
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