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SMS415 > Ch.6- telecommunications and networks > Flashcards

Ch.6- telecommunications and networks Flashcards

1
Q

telecommunications

A

electronic transmission of signals for communications

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2
Q

telecommunications medium

A

material substance carries an electronic signal between a sending/ receiving device

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3
Q

Networking protocol

A

-rules, algorithms, messages, other mechanisms, -enable software and hardware to communicate effectively

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4
Q

Synchronous

A

as soon as sent

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5
Q

Asynchronous

A

some delay

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6
Q

Simplex channe;

A

data in only 1 direction,

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7
Q

Half duplex channel

A

data in either direction, but not simultaneously (same time)

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8
Q

full duplex channel

A

transmission in both directions + at same time

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9
Q

channel bandwith

A

rate that data exchgd (bits per second)

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10
Q

Broadband communication

A

telecommunications system that can exchg data very quickly

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11
Q

circuit switching

A
  • dedicated

- sets up circuit between sender and receiver before any communications can occur

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12
Q

Packet switching network

A

no fixed path created

-The data broken into packets, sent individually

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13
Q

Transmission media- 2 categories:

  1. Guided transmission
  2. wireless
A
  1. guided along solid medium
  2. signal broadcast over airways
    - electromagnetic radiation
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14
Q

Twisted pair wire

A

Twisted pairs of copper wire, shielded/unshielded

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15
Q

coaxial cable

A

Inner conductor wire surrounded by insulation

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16
Q

Fibre optic cable

A

Extremely thin strands of glass bound together

-uses light beams to send signal

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17
Q

broadband over power lines

A

data transmitted over standard high voltage power lines

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18
Q

Guided transmission types: 4

A

Twisted-pair wire

Coaxial cable

Fibre optic cable

Broadband over power lines

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19
Q

Near field communication

A

very short range wireless connectivity technology designed for cell phones and credit cards
○ When 2 NFC devices are close to each other or touching- they exchange data

  • ○ Only 2 devices = peer to peer
    ○ By touching the “ hot spot” causes peer to peer network to be established and communications flow
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20
Q

Bluetooth

A
  • wireless communications specifications, describes how

- electronic devices can be interconnected over distances of 3-10 meters, rate of 2bps

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21
Q

Ultra wideband (UWB

A

-extremely short pulses (50-1000 picoseconds) -transmitted across broad range radio freq. of several gigahertz

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22
Q

iNFRARED TRANSMISSION

A

sends signal at freq of 300ghz and above

- ○ Requires line of sight and short distances

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23
Q

zIGbEE

A

Form of wireless communications freq used in security systems and heating and cooling trol systems

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24
Q

wI-FI

A

wireless telecommunications technology brand owned by the Wi-Fi alliance

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25
Q

mICROWAVE TRANSMISSION

A

High freq (300 mhz-300ghz) signal sent through air (see fig.6.4)

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26
Q

communications satellite

A

operates in microwave freq. range

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27
Q

geostationary satellite

A

orbits earth directly over equator– so appears stationary

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28
Q

Low earth orbit (LEO) satellite system

A

employs many satellites spaced so that from any point on earth at any time, at least 1 satellite visible

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29
Q

Very small aperture terminal (VSAT)

A

satellite ground station w/ dish antenna smaller than 3 metres in dia.

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30
Q

WIRELESS MESH

A

t uses many wifi access points to link series of interconnected local area networks to form wide area network capable of serving large campus or entire city

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31
Q

mICROWAVE TRANSMISSION

A

High freq (300 mhz-300ghz) signal sent through air

32
Q

3G WIRELESS COMMUNICATION

A

supports wireless voice and broadband communications—3G= 3rd generation of solutions for wireless voice and data

33
Q

Global system for Mobile (GSM)

A

globally accepted standard for digital cellular communications

34
Q

4G WIRELESS COMMUNICATION

A

4th generation broaband mobile wireless- more enhanced versions

35
Q

Worldwide Interoperability for microwave access (WiMAX)

A

set of IEEE 802.16 wireless metro area network standards that support various types of communications access

36
Q

cOMPUTER NETWORK

A

communications media, devices, software to connect 2 or more computer systems or devices.

37
Q

Personal area network (PAN)

A

support interconnection of information technology in range of 10 metres or so— i.e. home network

38
Q

Local area network (LAN)

A

connects computer systems and devices within small area (office, home, several floors of a building)

39
Q

metropolitan area network

A

connects users and their computers in geographical area that spans campus or city

40
Q

Wide area network

A

network that connects large geographic regions

41
Q

3 basic processing alternatives

A
  • Cetralized
  • decentralized
  • distributed
42
Q

Centalized processing

A

processing occurs in single location (CENTRALIZED- has center)

43
Q

Decentralized processing

A

processing devices placed at various remote locations (not centralized, no center)

44
Q

Distributed processign

A

processing devices placed at remote locations but connected to each other thru a network

45
Q

File sever system

A

hare data through file server computing

File server sends file containing data requested

46
Q

client server architecture

A

servers are dedicated to special functions like database mgmt, printing, communications, program execution
○ Each server accessible by all computers in network

47
Q

modems

A

elecommunications hardware

Converts (modulates/demodulates) communications signals so they can be transmitted over communications media

48
Q

modulation

A

rom digital to analog

49
Q

demodulation

A

analog to digital

50
Q

multiplexer

A

combines data from multiple data sources in to a single output signal that carries many channels

51
Q

demultiplexer

A

receiving end; choses correct destination from many possible destinations

52
Q

front end processors

A

special purpose computers that manage communications to and from large computer

53
Q

Private branch exchange (PBX)

A

telephone switching exchg that serves single org.
Enables users to share certain number of outside lines (trunk lines) to make telephone calls to ppl outside org.

  • ○ Dial only 3-4 digits to reach anyone in org (extension?)
54
Q

SWITCH

A

uses physical dev. Addr in each incoming msg. on network to determine to which output port it should send msg to reach another device on same network.

55
Q

BRIDGE

A

connects 2 LAN’s using same telecom

56
Q

ROUTER

A

forwards data packets (???) across 2 or more networks towards their destinations through routing.

57
Q

gATEWAY

A

serves as entrance to another network

58
Q

NETWORK OPERATING SYSTEM (NOS)

A

software that controls computer systems and devices on network and allows them to communicate with each other

59
Q

NETWORK MANAGEMENT SOFTWARE

A

enables mgr on networked desktop to monitor use of individual computers and shared hardware

60
Q

ENCRYPTION

A

converting original message into a form that can be understood only by receiver

61
Q

ENCRYPTION KEY

A

value that is applied (using algorithm) to set of unencrypted text to produce encrypted text or, to decrypt encrypted text

62
Q

VITRUAL PRIVATE NETWORK (VPN)

A

private network that uses public network (i.e. internet) to connect many remote locations

63
Q

DIGITAL SUBSCRIOBER LINE

A

using existing phone lines to deliver high speed internet access to homes and small biz

64
Q

ASYMMETRIC DSL (ADSL

A

provide connection speed from the internet to the user (download speed) hat is 3 - 4 times faster from user back to internet (upload speed)

65
Q

SYMETRIC DSL (SDSL)

A

used mainly by small businesses, doesn’t allow using phone same time

66
Q

VOICEMAIL

A

enables users to send, receive, store verbal msgs to and from other ppl

67
Q

VOICEMAILO TO TEXT

A

captures voice mail msg–>converts to text—> send to email acct

68
Q

REVERSE 911

A

delivers emergency notifications to users in a selected geographical area

69
Q

ELECTRONIC DOCUMENT DISTRIBUTION

A

allows sending and receiving of doc’s in digital form

70
Q

CALL CENTRE

A

where organization handles customer and other phone calls usually with some amount of computer automating

71
Q

AUTOMATIC CALL DISTRIBUTOR (ACD)

A

phone facility that manages incoming calls, handles the based on number called, and associated database of instructions

72
Q

TELECOMMUTING

A

use of computing devices and networks so that employees can work effectively away from office

73
Q

VIDEO CONFERENCING

A

enable ppl at various locations to communicate using simultaneous (same time) 2 way video and audio

74
Q

ELECTRONIC DATA INTERCHANGE (EDI)

A

way to communicate data from one company to next and from one app to another in standard format,

75
Q

ELECTRONIC FUNDS TRANSFER

A

trf money from one bank to another without any paper money exchanging hands

SMS415 (8 decks)

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