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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
mICROWAVE TRANSMISSION
High freq (300 mhz-300ghz) signal sent through air (see fig.6.4)
26
communications satellite
operates in microwave freq. range
27
geostationary satellite
orbits earth directly over equator-- so appears stationary
28
Low earth orbit (LEO) satellite system
employs many satellites spaced so that from any point on earth at any time, at least 1 satellite visible
29
Very small aperture terminal (VSAT)
satellite ground station w/ dish antenna smaller than 3 metres in dia.
30
WIRELESS MESH
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
31
mICROWAVE TRANSMISSION
High freq (300 mhz-300ghz) signal sent through air
32
3G WIRELESS COMMUNICATION
supports wireless voice and broadband communications---3G= 3rd generation of solutions for wireless voice and data
33
Global system for Mobile (GSM)
globally accepted standard for digital cellular communications
34
4G WIRELESS COMMUNICATION
4th generation broaband mobile wireless- more enhanced versions
35
Worldwide Interoperability for microwave access (WiMAX)
set of IEEE 802.16 wireless metro area network standards that support various types of communications access
36
cOMPUTER NETWORK
communications media, devices, software to connect 2 or more computer systems or devices.
37
Personal area network (PAN)
support interconnection of information technology in range of 10 metres or so--- i.e. home network
38
Local area network (LAN)
connects computer systems and devices within small area (office, home, several floors of a building)
39
metropolitan area network
connects users and their computers in geographical area that spans campus or city
40
Wide area network
network that connects large geographic regions
41
3 basic processing alternatives
- Cetralized - decentralized - distributed
42
Centalized processing
processing occurs in single location (CENTRALIZED- has center)
43
Decentralized processing
processing devices placed at various remote locations (not centralized, no center)
44
Distributed processign
processing devices placed at remote locations but connected to each other thru a network
45
File sever system
hare data through file server computing | File server sends file containing data requested
46
client server architecture
servers are dedicated to special functions like database mgmt, printing, communications, program execution ○ Each server accessible by all computers in network
47
modems
elecommunications hardware | Converts (modulates/demodulates) communications signals so they can be transmitted over communications media
48
modulation
rom digital to analog
49
demodulation
analog to digital
50
multiplexer
combines data from multiple data sources in to a single output signal that carries many channels
51
demultiplexer
receiving end; choses correct destination from many possible destinations
52
front end processors
special purpose computers that manage communications to and from large computer
53
Private branch exchange (PBX)
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
SWITCH
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
BRIDGE
connects 2 LAN's using same telecom
56
ROUTER
forwards data packets (???) across 2 or more networks towards their destinations through routing.
57
gATEWAY
serves as entrance to another network
58
NETWORK OPERATING SYSTEM (NOS)
software that controls computer systems and devices on network and allows them to communicate with each other
59
NETWORK MANAGEMENT SOFTWARE
enables mgr on networked desktop to monitor use of individual computers and shared hardware
60
ENCRYPTION
converting original message into a form that can be understood only by receiver
61
ENCRYPTION KEY
value that is applied (using algorithm) to set of unencrypted text to produce encrypted text or, to decrypt encrypted text
62
VITRUAL PRIVATE NETWORK (VPN)
private network that uses public network (i.e. internet) to connect many remote locations
63
DIGITAL SUBSCRIOBER LINE
using existing phone lines to deliver high speed internet access to homes and small biz
64
ASYMMETRIC DSL (ADSL
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
SYMETRIC DSL (SDSL)
used mainly by small businesses, doesn’t allow using phone same time
66
VOICEMAIL
enables users to send, receive, store verbal msgs to and from other ppl
67
VOICEMAILO TO TEXT
captures voice mail msg-->converts to text---> send to email acct
68
REVERSE 911
delivers emergency notifications to users in a selected geographical area
69
ELECTRONIC DOCUMENT DISTRIBUTION
allows sending and receiving of doc's in digital form
70
CALL CENTRE
where organization handles customer and other phone calls usually with some amount of computer automating
71
AUTOMATIC CALL DISTRIBUTOR (ACD)
phone facility that manages incoming calls, handles the based on number called, and associated database of instructions
72
TELECOMMUTING
use of computing devices and networks so that employees can work effectively away from office
73
VIDEO CONFERENCING
enable ppl at various locations to communicate using simultaneous (same time) 2 way video and audio
74
ELECTRONIC DATA INTERCHANGE (EDI)
way to communicate data from one company to next and from one app to another in standard format,
75
ELECTRONIC FUNDS TRANSFER
trf money from one bank to another without any paper money exchanging hands

SMS415 (8 decks)

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