USB

Question 1

Q: How many devices can a single bus support? (USB related)

Answer 1

A: 127 devices.

Question 2

The USB can support 5 tiers of hubs, what is this structure called?

Answer 2

Tiered star topology.

Question 3

The primary hub that all others connect to is called? (USB related)

Answer 3

The root hub.

Question 4

Where is the root hub typically integrated with?

Answer 4

The USB controller host on the motherboard.

Question 5

Each (USB) hub, including the root hub, counts as what?

Answer 5

A device.

Question 6

Why do you have to be careful about connecting more devices to a USB hub?

Answer 6

because bandwidth is shared among all devices connected to the same USB bus.

The more devices, the slower they all operate.

Question 7

What’s the main thing you need to know about different versions of USB?

Answer 7

Their data rates.

Question 8

What is version association?

Answer 8

Version association means that if you connect
for example..

a USB 2.0 device using a USB 1.1 cable, you’ll be limited to the cable’s slower data rate.

Question 9

USB 1.1 runs at how many megabits per second between its first and second version?

Answer 9

version one is 1.5 Mbps

whereas

version two is 12 Mbps

Question 10

USB 2.0 is often referred to as hi-speed USB; why?

Answer 10

USB 2.0 has a maximum data rate of 480 Mbps.

Question 11

Does USB 2.0 have backwards compatibility?

Answer 11

Yes.

Question 12

The data rate of USB 3.0?

Answer 12

5 Gbps

Question 13

Maximum data rate of USB 3.1 is?

Answer 13

10Gbps

Question 14

How are USB 3.0 ports identified?

Answer 14

By their blue connectors.

Question 15

Where does a USB Type-A generally plug into?

Answer 15

The computer itself.

Question 16

Where does USB Type-B usually plug into?

Answer 16

Peripheral devices.

Question 17

What is USB Type-C? Why was it made?

Answer 17

1. A universal USB

2. So you don’t need to own hundreds of special connectors, reducing clutter.

Question 18

USB Type B has bi-directional power flow, what is this?

Answer 18

Power that runs in both directions from system and peripheral.

Question 19

What is hot plugging?

Answer 19

The ability to connect and disconnect devices while the computer or device is powered on.

Question 20

Can USBs provide power over their connection?

Answer 20

Yes!
500 miliamps of power from a USB 2.0 port.

900 for a 3.0 port.

Question 21

What does a USB type A look like?

Answer 21

A rectangular connector.

Question 22

A type B USB connector looks like?

Answer 22

A square connector with two beveled corners.

Question 23

Type C connectors look like?

Answer 23

A long thin oval connector.