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Prelims(2nd sem) > ITEC45 (Sir Rollo) > Flashcards

ITEC45 (Sir Rollo) Flashcards

1
Q

The physical means by which data is transmitted from one
geographic or electronic location to another

A

transmission, or “communication” media.

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2
Q

physical path between the transmitter and the receiver.

A

transmission medium

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3
Q

all other factors remaining constant, the greater the
bandwidth of a signal, the higher the data rate that
can be achieved.

A

bandwith

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4
Q

impairments, such as attenuation, limit the distance.

A

Transmission Impairments

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5
Q

is particular concern for unguided media, but is also a problem with guided media.

A

Interference

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6
Q

A guided medium can be used to construct a
point to-point link or a shared link with multiple
attachments.

A

Number of receivers

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7
Q

referred to as Wired or Bounded transmission
media.

are physical cables that signals travel through
on a narrow path.

  • are made up of an external conductor (usually
    copper) wrapped in a jacket made of
    nonconductive material.
A

Guided Media or Bounded

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8
Q

includes telephony, telegraphy, and television, means communication at a distance

A

Telecommunication

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9
Q

refers to information presented in whatever form is agreed upon by the parties creating and using the data.

A

data

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10
Q

are the exchange of data between two devices via some form of transmission medium such as a wire cable

A

Data Communication

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11
Q

The system must deliver data to the correct destination. Data must be received by the intended device or user and only by that device or user.

A

Delivery

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12
Q

The system must deliver the data accurately. Data that have been altered in transmission and left uncorrected are unusable.

A

Accuracy

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13
Q

The system must deliver data in a timely manner. Data delivered late are useless. In the case of video and audio, timely delivery means delivering data as they are produced, in the same order that they are produced, and without significant delay. This kind of delivery is called real-time transmission.

A

Timeliness

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14
Q

refers to the variation in the packet arrival time. It is the uneven delay in the delivery of audio or video packets.

A

Jitter

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15
Q

is one of the most commonly used modes of communication now a days.

is a mode of communication where the information or the thought is encoded digitally as discrete signals and electronically transferred to the recipients.

A

Digital Communication

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16
Q

is the transmission of digital pulses between two or more points in a communication system.

A

Digital transmission

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17
Q

is the transmitted of digital modulated analog carriers between two or more points in a communication system.

A

Digital radio

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18
Q

This sequence of binary digits is called

A

information sequence.

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19
Q

the process of efficiently converting the output of whether analog or digital source into a sequence of binary digits is known as

A

Source Encoding or Data Compression

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20
Q

is to introduced, in controlled manner, some redundancy in the binary information sequence that can be used at the receiver to overcome the effects of noise and interference encountered in the transmission on the signal through the channel.

A

Channel Encoder

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21
Q

convert the sequence into electric signals so that we can transmit them on channel

maps the binary sequences into signal wave forms , for example if we represent 1 by sin x and 0 by cos x then we will transmit sin x for 1 and cos x for 0. ( a case similar to BPSK)

A

Digital Modulator

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22
Q

is the physical medium that is used for transmitting signals from transmitter to receiver.

A

Channel

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23
Q

processes the channel corrupted transmitted waveform and reduces the waveform to the sequence of numbers that represents estimates of the transmitted data symbols.

A

Digital Demodulator

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24
Q

tries to decode the sequence from the knowledge of the encoding algorithm. And which results in the approximate replica of the input at the transmitter end.

A

Source Decoder

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25
Q

Finally we get the desired signal in desired format analog or digital.

A

Output Transducer

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26
Q

is the information (data) to be communicated. Popular forms of information include text, numbers, pictures, audio, and video.

A

Message

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27
Q

is the device that sends the data message. It can be a computer, workstation, telephone handset, video camera, and so on

A

Sender

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28
Q

is the device that receives the message. It can be a computer, workstation, telephone handset, television, and so on.

A

receiver

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29
Q

is a set of rules that govern data communications. It represents an agreement between the communicating devices. Without a protocol, two devices may be connected but not communicating, just as a person speaking French cannot be understood by a person who speaks only Japanese.

A

protocol

30
Q

is an electrical or electromagnetic current that is used for carrying data from one device to another

A

Signal

31
Q

are in continuous wave form in nature and represented by continuous electromagnetic waves

A

Analog Signal

32
Q

are discrete in nature and represent sequence of voltage pulses.

are used within the circuitry of a computer system.

A

Digital Signal

33
Q

This method is used to send computer information over transmission channels that require analog signals, like a fiber optic networks, computer modems, cellular phone networks, and satellite systems. In each of this systems, an electromagnetic carrier wave is used to carry the information over great distances and connect digital information users at remote locations.

A

Digital Data with Analog Signals

34
Q

A digital signal can be transmitted over a dedicated connection between two or more users. In order to transmit analog data, it must first be converted into a digital form. This process is called sampling, or encoding.

A

Analog Data with Digital Signals

35
Q

is a collection of zeroes and ones, where the value at any one time is called a bit

A

digital data

36
Q

It is communication path through which data or information can be send from one node to another node.

A

Channel

37
Q

Maximum rate at which data can be transmitted over a communication path or channel is called

A

Channel Capacity

38
Q

is named after the two conductors that run
parallel to each other.

  • the center conductor in the cable is usually
    copper, which is usually either a solid wire or
    stranded, twisted copper

Cable TVs and analog television networks
widely use this.

  • has an inner conductor surrounded by a
    tubular insulating layer, surrounded by a
    tubular conducting shield. Many coaxial cables
    also have an insulating outer sheath or jacket
A

coaxial cable

39
Q

-dedicated cable bandwidth
- use digital signaling over a single wire
-is bidirectional, allowing computers to
both send and receive data using a single
cable.
- the sending and receiving cannot occur on
the same wire at the same time

A

Baseband mode

40
Q

uses digital signaling, broadband uses
analog signals in the form of optical or
electromagnetic waves over multiple
transmission frequencies
-for signals to be both sent and received,
the transmission media must be split into
two channels.
- two cables can be used: one to send and
one to receive transmissions.

A

Broadband mode

41
Q

it consists of two separately insulated
conductor wires wound about each other.
Generally, several such pairs are bundled
together in a protective sheath.
-is made of pairs of solid
or stranded copper twisted along each other

A

Twisted Pair

42
Q

is the unintentional transfer of signals from
one channel to another channel, creating
interference.

A

crosstalk

43
Q

type of cable has the ability to block
interference and does not depend on a
physical shield for this purpose

A

Unshielded twisted-pair (UTP)

44
Q

-type of cable consists of a special jacket to
block external interference
- It is used in fast-data-rate Ethernet and in
voice and data channels of telephone lines.

A

Shielded twisted-pair (STP)

45
Q

-It uses the concept of reflection of light
through a core made up of glass or plastic.
=It is used for transmission of large volumes of
data.

A

Optical Fibre

46
Q

Has a larger core diameter that lets multiple
modes of light propagate
- The amount of light reflections increase as they
travel through the core, which allows more data
to pass through

A

Multi Mode Cables

47
Q

-It is also referred to as Wireless or Unbounded
transmission media.
- No physical medium is required for the
transmission of electromagnetic signals

A

Unguided Media or Unbounded

48
Q

is to provide the rules and regulations that allow computers with different disk operating systems, languages, cabling and locations to share resources.

A

Data Communication

49
Q

is defined as the rate of transference of error ­free data.
it is measured by the response time.

A

performance

50
Q

is the elapsed time between the end of an inquiry and the beginning of a response

A

response time

51
Q

the speed that the data will be transmitted at measured in bits per second (bps).

A

Transmission Speed

52
Q

the type of physical connection used to connect nodes together.

A

Media Type

53
Q

is the predictability of response time and accuracy of data.

A

consistency

54
Q

is the measure of how often a network is usable.

A

Reliability

55
Q

is a measure of the average time a component is expected to operate between failures, and is normally provided by the manufacturer.

A

MTBF (Mean Time between Failures)

56
Q

is the network’s ability to return to a prescribed level of operation after a network failure.

A

Recovery

57
Q

is the protection of hardware, software and data from unauthorized access.

A

security

58
Q

the transmitter of data.

the starting point of the data.

A

Source

59
Q

The communications stream through which the data is being transmitted.

A

Medium

60
Q

the interface between the source and the medium, and the medium and the receiver.

are a physical piece of equipment.

refers to computer hardware devices used to establish, maintain and terminate communication network sessions between a data source and its destination.

A

DCE (Data Communication Equipment)

61
Q

is the telecommunications name given to the source and receiver’s equipment.

also be called tail circuits.

is an end instrument that converts user information into signals or reconverts received signals.

DTE (Data Terminal Equipment)

A

DTE (Data Terminal Equipment)

62
Q

This includes storage and retrieval of information, reducing the need for paper traffic and record keeping in paper format, as well as rationalizing the time that staff spends producing correspondence and accounts.

A

Business

63
Q

it is standard procedure to use networks to share data and use remote computers to carry out large computations

A

Scientific Use

64
Q

defines the direction of signal flow between two connected devices.

also known as communication mode.

means transferring of data between two devices

A

Transmission Modes

65
Q

is the process of sending data one bit at a time, sequentially, over a communication channel or computer bus

Bit serial transmission is necessary in data communications if only a single channel is available.

one channel will pass only one bit at a time.

A

Serial communications

66
Q

is a method of sending several data signals simultaneously over a transmission link at one time.

it comprises of several wired channels in parallel.

there is a onetime transfer of data from source to destination.

A

Parallel communications

67
Q

the communication is unidirectional, as on a one-way street. Only one of the two devices on a link can transmit, the other can only receive.

the simplex mode can use the entire capacity of the channel to send data in one direction.

it is rarely used for data communication.

A

Simplex Mode

68
Q

is used in cases where there is no need for communication in both direction at the same time.

can alternately send and receive data but not at the same time. When one device is sending, the other can only receive, and vice versa

A

Half­ Duplex Mode

69
Q

both stations can transmit and receive simultaneously.

signals going in one direction share the capacity of the link with signals going in other direction.

is used when communication in both direction is required all the time.

A

Full Duplex Mode

70
Q
A

Prelims(2nd sem) (4 decks)

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