ITPEC IP April 2018 Question 11

Topic: Computer Component

Which of the following is a characteristic common to IEEE 1394 and USB that are often used for connection interfaces between PCs and peripheral devices?

a)Peripheral devices can be connected and disconnected while the PC and/or devices are powered on.b)A maximum transfer rate is 100 Mbits/second.c)A unique ID must be assigned to each device connected to a PC.d)Data can be transmitted in parallel over multiple data lines.

Explanation

Devices can be connected and disconnected while powered on — both USB and IEEE 1394 support hot plugging.

USB and IEEE 1394 are serial interfaces that detect when a device is attached or removed, so the PC does not have to be shut down to change peripherals. Each also assigns device addresses automatically when a device is connected.

Answer (a)

Why not others:

•(b) — the maximum rate depends on the standard and version: IEEE 1394 runs at 100 to 800 Mbit/s, and USB 2.0 already reaches 480 Mbit/s
•(c) — no ID has to be set for each device; the interface assigns addresses automatically, unlike SCSI, where an ID is set on each device by hand
•(d) — both are serial interfaces that send data one bit at a time over a single data path; parallel transmission is used by interfaces such as IEEE 1284 and SCSI

Key rule: USB and IEEE 1394 are serial interfaces with hot plugging and automatic device recognition; their transfer rates differ by version.

Computer Component · AI-written, may contain errors

Previous Next

Practice this exam

This question comes from an official ITPEC past paper. ITPEC Practice is an independent study tool and is not affiliated with ITPEC. See the official IP past-paper collection or Report an issue.