USB Flashcards
Q: How many devices can a single bus support? (USB related)
A: 127 devices.
The USB can support 5 tiers of hubs, what is this structure called?
Tiered star topology.
The primary hub that all others connect to is called? (USB related)
The root hub.
Where is the root hub typically integrated with?
The USB controller host on the motherboard.
Each (USB) hub, including the root hub, counts as what?
A device.
Why do you have to be careful about connecting more devices to a USB hub?
because bandwidth is shared among all devices connected to the same USB bus.
The more devices, the slower they all operate.
What’s the main thing you need to know about different versions of USB?
Their data rates.
What is version association?
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.
USB 1.1 runs at how many megabits per second between its first and second version?
version one is 1.5 Mbps
whereas
version two is 12 Mbps
USB 2.0 is often referred to as hi-speed USB; why?
USB 2.0 has a maximum data rate of 480 Mbps.
Does USB 2.0 have backwards compatibility?
Yes.
The data rate of USB 3.0?
5 Gbps
Maximum data rate of USB 3.1 is?
10Gbps
How are USB 3.0 ports identified?
By their blue connectors.
Where does a USB Type-A generally plug into?
The computer itself.
Where does USB Type-B usually plug into?
Peripheral devices.
What is USB Type-C? Why was it made?
- A universal USB
2. So you don’t need to own hundreds of special connectors, reducing clutter.
USB Type B has bi-directional power flow, what is this?
Power that runs in both directions from system and peripheral.
What is hot plugging?
The ability to connect and disconnect devices while the computer or device is powered on.
Can USBs provide power over their connection?
Yes!
500 miliamps of power from a USB 2.0 port.
900 for a 3.0 port.
What does a USB type A look like?
A rectangular connector.
A type B USB connector looks like?
A square connector with two beveled corners.
Type C connectors look like?
A long thin oval connector.
