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A+ > USB > Flashcards

USB Flashcards

1
Q

What came before the USB?

A

Serial cables

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2
Q

How are serial cables connected to a computer?

A

Using either a DB9 or a DB25 connecter. DB9 is more commonly used.

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3
Q

How do serial cables send data?

A

Serial cables send data as 1’s and 0’s in a straight line, 1 bit at a time.

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4
Q

How fast are serial cables?

A

The fasted speed of a serial cable is 115 Kbps.

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5
Q

Where are serial cables used in todays society?

A

Connecting to a communications port on a router or switch. Older mice and keyboards, external modems.

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6
Q

How many devices can connect to 1 serial cable?

A

1.

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7
Q

How many devices can connect to 1 USB?

A

127.

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8
Q

What is it called when you connect multiple USB slots to 1 USB?

A

A daisy chain.

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9
Q

What is larger? 1000 Gbps or 250 GBps?

A

250 GBps.

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10
Q

What is larger? 5000 Gbps or 800 GBps?

A

800 GBps.

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11
Q

Is each USB port controlled by a host controller?

A

Yes

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12
Q

Do host controllers use the same bandwidth for all devices on a port?

A

Yes

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13
Q

What do longer USB cables give you?

A

Higher chances of resistance and signal deterioration.

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14
Q

How fast is a Low Speed USB 1.0?

A

1.5Mbps.

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15
Q

How fast is a Full Speed USB 1.1?

A

12 Mbps.

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16
Q

How fast is a Hi-Speed USB 2.0?

A

480Mbps.

17
Q

How fast is a Super Speed USB 3.1 Gen 1?

A

5Gbps.

18
Q

How fast is a Super Speed USB 3.1 Gen 2?

A

10 Gbps.

19
Q

How fast is a Super Speed USB Gen 2x2?

A

20 Gbps.

20
Q

How fast is a USB 4?

A

40 Gbps.

21
Q

How long is the maximum cable length for speed in all USB types?

A

USB 1.0, USB 3.0 and USB 4 = 3 Meters. USB 1.1 and 2.0 = 5 Meters.

22
Q

How many Amps does USB 1.0 and 2.0 provide?

A

500 Milliamps / 0.5 Amps.

23
Q

How many Amps does USB 3 Provide?

A

900 Milliamps / 0.9 Amps.

24
Q

How many Amps does a Powered Device port give you?

A

1500 Milliamps / 1.5 Amps

25
Q

How many Amps does a wall outlet provide?

A

2000 Milliamps/ 2 Amps

A+ (4 decks)

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