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Block 3 > Fundamentals of Data Transfer > Flashcards

Fundamentals of Data Transfer Flashcards

1
Q

Define Error Detection

A

ability to detect the presence of errors caused by noise or other impairments

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2
Q

3 main impairments or errors

A

Attentuation, Distortion, Noise

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3
Q

Define Error Correction

A

ability to reconstruct the original, error free data

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4
Q

Types of error detection:

A

Redundancy
Encoding
Parity Check
Block Check
Cyclic Redundancy Check

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5
Q

Most common error detection

A

Redundancy
Parity Check
Cyclic Redundancy Check

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6
Q

What is the simplest method of error detection

A

Redundancy

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7
Q

What is the most widely used error detecting

A

Parity Check

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8
Q

There are five types of single character parity used. Only three are predominately used; what are they:

A

Even
Odd
None

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9
Q

What type of transmission uses Even parity check

A

Synchronous transmission, even # of 1s in the byte

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10
Q

What type of transmission uses Even parity check

A

Asynchronous transmission, odd # of 1s in the byte

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11
Q

How effective is Cyclic Redundancy Check

A

99.9 %

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12
Q

What type of transmission Cyclic Redundancy Check uses?

A

Synchronous Data Transmission

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13
Q

Error correction is inadequate when dealing with wireless comms for what reasons:

A
  • bit error rate on wireless can be quite high, this would result in large amount of retransmissions
  • FEC is a method of correcting errors by putting extra bits in a transm
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14
Q

Types of Multiplexing

A

Frequency Division Multiplexing
Time Division Multiplexing
Statistical Multiplexing
Dense Wave Divisiom Multiplexing

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15
Q

Types of compression techniques

A

Lossy compression
Lossless compression

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16
Q

Other compression techniques

A

Packed Decimal
Relative Encoding
Huffman Encoding

17
Q

Connection negotiation serves three main purposes

A
  • it allows each end to assure that the other exists
  • it allows exchange or negotiation of optional parameters
  • it triggers allocation of transport entity reaource

Block 3 (4 decks)

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