Pages in this set

Page 1

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Role of Communication
Systems

Page 2

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Introduction
The information age
­ Made possible by development of telecommunications
­ Modern business dependent upon telecommunications
· Telephone
· Fax
· Various computer links
­ Public lines
­ Private cables
­ Microwave
­ Fibre-optic links
­ Satellite

Page 3

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Communication systems
The Internet
LAN (Local Area Network)
WAN (Wide Area Network)
The World Wide Web
Electronic bulletin boards
Intranets

Page 4

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The Internet
Essentially an enormous WAN
­ LAN ­ Local Area Network
­ WAN ­ Wide Area Network ­ connects computers and
networks over a large geographical area
Developed from ARPANet ­ US Department of
Defense late 60s
­ Creators first to see computers as communication
devices rather than just…

Page 5

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The World Wide Web
A collection of pages stored on computers
throughout the world joined by hypertext links.
­ A link may be text or graphics
­ When you click upon them you be taken automatically to
a related web page
Access provided and facilitated by browsers such
as Netscape…

Page 6

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Bulletin Boards
Information exchange and discussion areas
Set up by:
­ Academics
­ User groups
­ Also used for illicit activities such as terrorism
and paedophilia

Page 7

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Intranets
Essentially a private internet
Set up by companies or schools
­ Allow sharing of information
· Documents
· Databases
· Applications
Microsoft Office software allows businesses
to view documents as web pages

Page 8

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Electronic mail (E-mail)
E-mail has many advantages over both ordinary mail
and the telephone. For example:
­ A message can be sent from your desk to anywhere in
the world at the price of a local call
­ The same message can be sent simultaneously to a
group of people…

Page 9

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Disadvantages of e-mail
Overload
Viruses
Easy to overlook
Misuse

Page 10

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Accessing the Internet
Basic hardware requirements
Computer
Telephone line
­ Standard line is cheapest option ­ theoretically up to 56K
bps (bits per second)
­ ISDN (Integrated Subscriber Digital line) 128K bps
­ ADSL (Asymmetric Digital Subscriber Line) 8M bps
downstream, 640K bps upstream
Modem (Modulator/Demodulator) for analogue lines
­…

Comments

Mr A Gibson

This contains some useful information which could be used as initial notes for the topic. Accessible due to the layout and flow of material. Gives some good definitions to dispel common myths.

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