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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
Q

In this modulation it combines phase and amplitude

A

Quadrature Amplitude modulation (QAM)

26
Q

what does 16QAM mean

A

16 different events with 4 bits/baud

27
Q

Types of modulation

A
  • Amplitude modulation
  • Frequency modulation
  • Phase modulation
  • Quadrature amplitude modulation
28
Q

Amplitude refers to

A

Loudness

29
Q

Frequency refers to

A

Vibration speed

30
Q

Phase refers to

A

position of wave measured in degree

31
Q

2 station data communication circuit diagram/flow

A

Digital information source -> Transmitter -> Transmission medium -> Receiver -> Digital information destination

32
Q

may come from a mainframe computer, personal computer, workstation, or any other digital equipment.

A

source/destination

33
Q

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.

A

transmitter

34
Q

carries the encoded signals from the transmitter to the receiver.

A

transmission medium

35
Q

types of transmission medium

A
  • free space radio transmission
  • Metallic cables
  • Optical fiber cables
36
Q

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.

A

receiver

37
Q

used to represent characters and symbols such as letters, digits and punctuation marks

A

data communication codes

38
Q

data communication codes are called

A
  • character code
  • character sets
  • character languages
  • symbol codes
39
Q

it interface computers, computer networks and other digital terminal equipment to analog communication lines and radio channels

A

data modem

40
Q

a modem is sometimes called

A
  • Data communication equipment
  • Data Set
  • Data phone
41
Q

Modem use one of the following modulation technique

A
  • Amplitude shift keying
  • Frequency shift keying
  • Phase shift keying
  • Quadrature amplitude modulation
42
Q

2 types of modems

A
  • Synchronous
  • Asynchronous
43
Q

In these type of Modems, clocking information is recovered in the receiver.

A

Synchronous

44
Q

In these type of Modems it uses the modulation technique PSK and QAM

A

Synchronous

45
Q

In these type of Modems it can be used for medium and high speed applications up to 57.6 Kbps

A

Synchronous

46
Q

In these type of Modems, clocking information is not recovered at receiver and may not require.

A

Asynchronous

47
Q

In these type of Modems it uses the modulation technique ASK and FSK

A

Asynchronous

48
Q

In these type of Modems it can be used for low speed applications below 2.4 Kbps

A

Asynchronous

49
Q

Modem Control

A

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
Q

Types of AT mode

A
  • AT command mode
  • AT on-line mode
51
Q

All modem commands in the AT command set begin with the ASCII characters

A

AT (Attention)

52
Q

Once communications have been established with a remote modem, the local modem switches to the

A

on-line mode

53
Q

2 categories of error control

A
  • Error detection
  • Error correction
54
Q

What error control category is being referred when transmitted data is corrupted

A

Error detection

55
Q

What error control category is being referred when original data is corrupted

A

Error correction

56
Q

Baud rate of sync modem

A

2400

57
Q

Baud rate of async modem

A

1200 - 1800

58
Q

In a frame, there is only one bit, anywhere though, which is corrupt

A

single bit error

59
Q

Frame is received with more than one bits in corrupted state

A

multiple bit error

60
Q

Frame contains more than 1 consecutive bits corrupted

A

burst error

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

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