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1st sem (2nd YR) > Comms 2 (Mod 3 & 5) > Flashcards

Comms 2 (Mod 3 & 5) Flashcards

1
Q

Number of binary bits 1’s or 0’s to be transmitted per second

A

Bit rate

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2
Q

The number of line “symbols” transmitted per second

A

Baud rate

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3
Q

Number of transmission channels

A

Channels

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4
Q

Machine code is also called

A

Machine language

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5
Q

In machine code when we say possible combination it refers to

A

Code points

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6
Q

Types of characters in machine codes

A
  • Alphanumeric
  • Format Effector
  • Control (device and transmission)
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7
Q

4 types of specific code

A
  • Baudot code
  • American Standard Code for Information Exchange (ASCII)
  • Extended Binary Coded Decimal Interchange Code (EBCDIC)
  • UNICODE
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8
Q

How many bits and code points does baudot code have

A
  • 5 bits
  • 32 code points
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9
Q

What institution created ASCII

A

American National Standard Institution

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10
Q

How many bits does ASCII have

A
  • 7 bits
  • 8 bits for parity bit
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11
Q

How many most significant bits and least significant bits does ASCII have

A
  • 6 to 4 MSB
  • 3 to 0 LSB
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12
Q

What type of specific code is used by microcomputers

A

ASCII

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13
Q

Baudot code is also called as

A

International teleprinter code

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14
Q

How many characters in ASCII

A

128

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15
Q

How many bits in EBCDIC

A

8 bits

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16
Q

What type of specific code is used on IBM mainframe computers

A

EBCDIC

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17
Q

How many most significant bits and least significant bits does EBCDIC have

A
  • 0 to 3 MSB
  • 4 to 7 LSB
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18
Q

Types of signal

A
  • Digital
  • Analog
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19
Q

No. of signal changes (amplitude, frequency, or phase) on a circuit per second

A

Signal rate (baud)

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20
Q

No. of bits that a circuit can carry in 1 second

A

Speed (bps)

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21
Q
  • Height of the signals
  • Susceptible to noise and interference
A

Amplitude modulation (AM)

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22
Q
  • Frequency shift keying (FSK)
  • Width of the signals
  • Less interference than AM
A

Frequency modulation (FM)

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23
Q

Phase shift keying (PSK): a change from 1 to 0, or 0 to 1

A

Phase modulation (PM)

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24
Q

In phase modulations how many bits are the following
- 180 deg
- 90 deg
- 45 deg

A
  • 1 bit
  • 2 bits
  • 3 bits
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25
In this modulation it combines phase and amplitude
Quadrature Amplitude modulation (QAM)
26
what does 16QAM mean
16 different events with 4 bits/baud
27
Types of modulation
- Amplitude modulation - Frequency modulation - Phase modulation - Quadrature amplitude modulation
28
Amplitude refers to
Loudness
29
Frequency refers to
Vibration speed
30
Phase refers to
position of wave measured in degree
31
2 station data communication circuit diagram/flow
Digital information source -> Transmitter -> Transmission medium -> Receiver -> Digital information destination
32
may come from a mainframe computer, personal computer, workstation, or any other digital equipment.
source/destination
33
encodes the source information and converts it to a different form and the transmitter acts as an interface between the source equipment and the transmission medium.
transmitter
34
carries the encoded signals from the transmitter to the receiver.
transmission medium
35
types of transmission medium
- free space radio transmission - Metallic cables - Optical fiber cables
36
converts the encoded signals received from the transmission medium back to their original form. The receiver acts as an interface between the transmission medium and the destination equipment.
receiver
37
used to represent characters and symbols such as letters, digits and punctuation marks
data communication codes
38
data communication codes are called
- character code - character sets - character languages - symbol codes
39
it interface computers, computer networks and other digital terminal equipment to analog communication lines and radio channels
data modem
40
a modem is sometimes called
- Data communication equipment - Data Set - Data phone
41
Modem use one of the following modulation technique
- Amplitude shift keying - Frequency shift keying - Phase shift keying - Quadrature amplitude modulation
42
2 types of modems
- Synchronous - Asynchronous
43
In these type of Modems, clocking information is recovered in the receiver.
Synchronous
44
In these type of Modems it uses the modulation technique PSK and QAM
Synchronous
45
In these type of Modems it can be used for medium and high speed applications up to 57.6 Kbps
Synchronous
46
In these type of Modems, clocking information is not recovered at receiver and may not require.
Asynchronous
47
In these type of Modems it uses the modulation technique ASK and FSK
Asynchronous
48
In these type of Modems it can be used for low speed applications below 2.4 Kbps
Asynchronous
49
Modem Control
AT - Attention A - Answer an incoming call DT - Dial using DTMF tones DP - Dial using Pulse dialing E0 - Do not echo transmitted data to terminal screen E1 - Echo transmitted data to terminal screen F0 - Half duplex communication F1 - Full duplex communication H - Go on hook (hang up) O - Switch from command to on-line mode Z - Reset mode +++ - Switch from on-line mode to command mode (escape code)
50
Types of AT mode
- AT command mode - AT on-line mode
51
All modem commands in the AT command set begin with the ASCII characters
AT (Attention)
52
Once communications have been established with a remote modem, the local modem switches to the
on-line mode
53
2 categories of error control
- Error detection - Error correction
54
What error control category is being referred when transmitted data is corrupted
Error detection
55
What error control category is being referred when original data is corrupted
Error correction
56
Baud rate of sync modem
2400
57
Baud rate of async modem
1200 - 1800
58
In a frame, there is only one bit, anywhere though, which is corrupt
single bit error
59
Frame is received with more than one bits in corrupted state
multiple bit error
60
Frame contains more than 1 consecutive bits corrupted
burst error

1st sem (2nd YR) (24 decks)

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