USB Flashcards
What came before the USB?
Serial cables
How are serial cables connected to a computer?
Using either a DB9 or a DB25 connecter. DB9 is more commonly used.
How do serial cables send data?
Serial cables send data as 1’s and 0’s in a straight line, 1 bit at a time.
How fast are serial cables?
The fasted speed of a serial cable is 115 Kbps.
Where are serial cables used in todays society?
Connecting to a communications port on a router or switch. Older mice and keyboards, external modems.
How many devices can connect to 1 serial cable?
1.
How many devices can connect to 1 USB?
127.
What is it called when you connect multiple USB slots to 1 USB?
A daisy chain.
What is larger? 1000 Gbps or 250 GBps?
250 GBps.
What is larger? 5000 Gbps or 800 GBps?
800 GBps.
Is each USB port controlled by a host controller?
Yes
Do host controllers use the same bandwidth for all devices on a port?
Yes
What do longer USB cables give you?
Higher chances of resistance and signal deterioration.
How fast is a Low Speed USB 1.0?
1.5Mbps.
How fast is a Full Speed USB 1.1?
12 Mbps.
How fast is a Hi-Speed USB 2.0?
480Mbps.
How fast is a Super Speed USB 3.1 Gen 1?
5Gbps.
How fast is a Super Speed USB 3.1 Gen 2?
10 Gbps.
How fast is a Super Speed USB Gen 2x2?
20 Gbps.
How fast is a USB 4?
40 Gbps.
How long is the maximum cable length for speed in all USB types?
USB 1.0, USB 3.0 and USB 4 = 3 Meters. USB 1.1 and 2.0 = 5 Meters.
How many Amps does USB 1.0 and 2.0 provide?
500 Milliamps / 0.5 Amps.
How many Amps does USB 3 Provide?
900 Milliamps / 0.9 Amps.
How many Amps does a Powered Device port give you?
1500 Milliamps / 1.5 Amps
How many Amps does a wall outlet provide?
2000 Milliamps/ 2 Amps
