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Jared Nationals > Signal Transmission > Flashcards

Signal Transmission Flashcards

1
Q

uses the available RF bandwidth much more efficiently than analog modulation

A

Digital modulation

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2
Q

the smallest unit of digital information. can take the value one or zero

A

bit

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3
Q

a group of bits (usually 8) sometimes referred to as a digital word

A

byte

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4
Q

4 bits

A

nibble

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5
Q

8 bits

A

Octet or Byte

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6
Q

a term related to digital communications speed

A

Baud

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7
Q

HSD

A

High Speed Data

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8
Q

bps

A

bits per second

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9
Q

QPSK

A

Quadrature Phase Shift Keying

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10
Q

Data is typically divided into chunks known as

A

blocks, frames, or packets.

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11
Q

QoS

A

quality of Service

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12
Q

specifies certain minimum performance levels for the customer

A

Quality of Service or QoS

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13
Q

OSI

A

Open Systems Interconnection

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14
Q

OSI Layer 1

A

Physical

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15
Q

OSI Layer 2

A

Data link

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16
Q

OSI Layer 3

A

Network

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17
Q

OSI Layer 4

A

Transport

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18
Q

OSI Layer 5

A

Session

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19
Q

OSI Layer 6

A

Presentation

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20
Q

OSI Layer 7

A

Application

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21
Q

OSI Layer that regenerates the physical signal and contains connectorization or the transport medium

A

Layer 1 / Physical Layer

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22
Q

OSI Layer responsible for Switches use media access control or hardware addresses, such as Ethernet for routing and filtering. Layer 2 contains two sublayers: MAC and LLC

A

Layer 2 / Data Link Layer

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23
Q

OSI Layer responsible for routing and path determination, IP, ICMP, OSPF, RIP & BGP

A

Layer 3 / Network Layer

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24
Q

OSI Layer responsible for the end-to-end flow control using TCP or UDP

A

Layer 4 / Transport Layer

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25
Q

OSI Layer responsible for the dialog control for setup, maintenance, and termination of the communication circuit

A

Layer 5 / Session Layer

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26
Q

OSI Layer responsible for the encryption/decryption, compression such as MPEG, MIDI, QuickTime, PICT, TIFF, JPEG, ASCII & EBCDIC

A

Layer 6 / Presentation Layer

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27
Q

OSI Layer responsible for the file, print, message, application, and database services

A

Layer 7 / Application Layer

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28
Q

IP

A

Internet Protocol

29
Q

a defined set of rules for moving digital data through a network.

A

Internet protocol or IP

30
Q

This information at the beginning of a frame in OSI Layer 2 is called

A

header

31
Q

This information at the end of a frame in OSI Layer 2 is called

A

trailer

32
Q

MPEG

A

Moving Picture Experts Group

33
Q

working group that was formed to establish standards for audio and video compression and transmission

A

Motion Picture Experts Group or MPEG

34
Q

method of reducing the number of bits required to transmit a given piece of information

A

compression

35
Q

HEVC

A

High-Efficiency Video Codec

36
Q

SPTS

A

single program transport stream

37
Q

ES

A

elementary streams

38
Q

PES

A

Packetized elementary stream

39
Q

PCR

A

Program clock reference

40
Q

PMT

A

program map table

41
Q

MPTS

A

Multi-program transport stream

42
Q

MTU

A

Maximum transmission unit

43
Q

What is the next-generation compression system that allows operators to compress UHD signals to be sent to their customers?

A

HEVC

44
Q

Digital data modulated onto a digital carrier is known as

A

digital modulation

45
Q

type of modulation typically used for digital data.

A

QAM

46
Q

QAM

A

Quadrature Amplitude Modulation

47
Q

four steps in converting an analog signal to a digital signal.

A

Sampling, Quantitizing, Encoding, Decoding

48
Q

first step in the A/D conversion process; means periodically measuring the amplitude of an analog signal.

A

Sampling

49
Q

second step in the A/D conversion process; thought of as “rounding” the sample to the closest discrete digital value.

A

Quantitizing

50
Q

Third step in the A/D conversion process; assigns each of the quantizing intervals a binary number.

A

Encoding

51
Q

Fourth step in the A/D conversion process; The binary signals that represent each samples are converted back into a sequence of pulses,

A

Decoding

52
Q

produced proof that showed that the full information content of any continuous signal can be recovered if the signal is measured and coded at a rate that is twice the frequency of the highest sinusoidal component of that signal.

A

Harry Nyquist

53
Q

the inverse of the Nyquist frequency is this

A

The Sampling interval

54
Q

The two most common types of multiplexing are

A

Frequency Division Multiplexing (FDM), Time-Division Multiplexing (TDM)

55
Q

the multiplexing technique used in the downstream path to deliver video signals, high-speed data, and voice.

A

Frequency Division Multiplexing (FDM)

56
Q

number of sources are multiplexed over a communication medium by assigning each a different time slot.

A

Time-Division Multiplexing (TDM)

57
Q

WDM

A

Wavelength Division Multiplexing

58
Q

TDMA

A

Time-Division Multiple Access

59
Q

a form of TDM in which multiple users have access to a single communication medium.

A

Time-Division Multiple Access (TDMA)

60
Q

ATDMA

A

Advanced Time-Division Multiple Access (Advanced TDMA)

61
Q

includes the use of higher-order modulation to improve throughput and enhanced coding to improve immunity to interference

A

Advanced Time-Division Multiple Access (Advanced TDMA)

62
Q

S-CDMA

A

Synchronous code division multiple access

63
Q

128 different orthogonal or non-interfering codes are used to encode the data such that up to 128 different data signals to be sent simultaneously.

A

Synchronous code division multiple access (S-CDMA)

64
Q

this type of multiplexing allows multiple cable modem to transmit data to the CMTS over a single connection

A

TDMA

65
Q

In this, users messages are sent within the same RF channel that the STB is tuned to in order to receive the desired program

A

In-band signaling

66
Q

uses a dedicated RF carrier for set-top data and requires a separate tuner to receive messages.

A

Out-of-band signaling

67
Q

The process of re-assigning channel numbers to the individual de-multiplexed television signals is known as

A

channel mapping

68
Q

When channel mapping data is transmitted to set-top boxes within the same RF channel that the STB is tuned to that is known as what kind of singling

A

In- Band

Jared Nationals (14 decks)

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