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Quiz 1 Flashcards

(47 cards)

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1
Q

Information Source: (Communication System)

A

generates the message to be transmitted

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2
Q

Transmitter: (Communication System)

A

converts the message to be transmitted

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3
Q

Transmission Medium/Channel: (Communication System)

A

carries the signal from the transmitter to the receiver

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4
Q

Nodes:

A

Users, transmitters, recievers

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5
Q

Receiver: (Communication System)

A

converts back the received signal

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6
Q

Transmission Link:

A

Channel that provides information exchange between two or more nodes

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7
Q

Information sink: (Communication System)

A

user of the received message

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8
Q

Elements of a communication system, in order:

A

Information Source, Transmitter, Channel, Receiver, Information Sink

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9
Q

Wide Area Network:

A

Covers a large geographical area, consists of interconnected switching nodes

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10
Q

Local Area Network:

A

Covers the scope of a building(s), provides a means for info exchange between connected devices and in some cases communication outside the LAN

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11
Q

Communication System

A

Set of elements that transmit useful information from one point to another

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12
Q

Baseband Transmitter elements, in order

A

Network and protocol layers, modulator, amplifier/channel interface

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13
Q

Personal Area Network

A

The scope of a room or 10m, interconnects a variety of devices for info exchange between them

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14
Q

Circuit Switching

A

Establishes a circuit, transfers info, then disconnects the circuit. Rather inefficient and only uses one path through nodes.

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15
Q

Network and Protocol Layers: (Baseband & Bandpass Transmission)

A

Allow sharing the same channel between different users and package information

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16
Q

Modulator: (Baseband & Bandpass Transmission)

A

the information is impressed within a certain bandwidth in a manner that can be suitably recovered by the receiver

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17
Q

Amplifier/Channel Interface: (Baseband Transmission)

A

increases the power of the signal and changes its shape or form to adapt it to the transmission medium

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18
Q

Criteria of Communication Network Deployment

A

Reliability (reliable info exchange between nodes)
Cost-effectiveness (sharing resources when possible)
Quality of Service
- Data Rate (quantity of info transmitted over time)
- Latency (Time between transmission and reception)
- Error Rate (# of erroneous info units over time)

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19
Q

Baseband Transmission drawbacks

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A

Excessively large antenna heights, signals get mixed up, short range of communication

20
Q

Open System Interconnection (OSI Model)

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A

Network functions are organized in a layered architecture. Each layer can be designed independently and communicates with 1 layer above and beneath it. The layers are PLNTSPA

21
Q

Baseband vs. Bandpass

Study These Flashcards
A

Wired vs. Wireless

22
Q

Bandpass elements, in order:

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A

Network and protocol layers, modulator, up-conversion and filter, amplifier, antenna

23
Q

Up-Conversion and filter: (Bandpass Transmission)

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A

this block converts the baseband signal at the output of the modulator to bandpass signal around a RF carrier

24
Q

Amplifier: (Bandpass Transmission)

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A

increases the power of the RF signal

25
Physical Layer
The digital communication link that delivers bits
26
Network Layer
Guides the packets from their source to their destination along any number of links
27
Time varying: (long distance property)
the channel (especially wireless) is a time varying system, its behavior changes versus time
28
Transport Layer
Supervises the end-to-end transmission of packets and can arrange for retransmission of erroneous packets.
29
Nonlinearity: (long distance property)
when a repeater or relay station is used (very long-distance communication), for example in satellite communication
30
Session Layer
Uses transmission layer services to set up and supervise between end systems.
31
Noise: (long distance property)
is mainly introduced by the random motion of electrons in circuits. It is significant in the receiver side because the signal power is low
32
Undesirable signal effects:
distortion, interference, noise
33
Presentation Layer
Handles data compression, security, and format conversions so that nodes that use different representations can communicate efficiently and clearly.
34
Distortion:
linear distortion or frequency selectivity, nonlinear distortion
35
Interference:
information from other signals mixing with current signal
36
Noise:
unwanted random quantity added to the signal
37
Bandwidth: (fundamental limitations)
applies to both signals and systems as a measure of speed. The ability of a system to follow signal variations is reflected in its usable frequency response, or transmission bandwidth. The available bandwidth determines the maximum signal speed, and thus the time required to transmit a given amount of information
38
Noise: (fundamental limitations)
is unavoidable. Thermal noise appears in every communication system. There are also other types of noise
39
Signal to noise ratio
determines the relative strength of a signal: S/N
40
Application Layer
Implements commonly used communication services including file transfer, directory services, virtual terminal, ect.
41
Definition of Channel Capacity formula:
C = B*log2( 1 + S/N ) C: channel capacity B: signal bandwidth
42
Transport Protocols
Transport Control Protocol (TCP) User Datagram Protocol (UDP)
43
Network Protocols
Internet Protocol (IP) Routing Protocols (RPs)
44
Link Protocols
Media Access Control (MAC) Address
45
Relationship between linear and logarithmic signal to noise ratio
linear ratio = 10^(log ratio/10)
46
Physical Protocols
Ethernet 802.11 (WiFi)
47
7 layers, in order:
Physical, Link, Network, Transport, Session, Presentation, Application

471 Quiz (1 decks)

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