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3.2) Examples of Communication
• This section examines three examples
of communication systems:
• messaging systems
• electronic commerce
• Teleconferencing is the use of an
electronic transmission to allow a
meeting to occur at the same time in
• It refers to an audio or video
• An audio conference is a telephone call
involving three or more separate callers
at different locations.
• Video conferences allow people in
different locations to hear and see each
• Teleconferencing simulates a face-to-
face meeting and reduces costs such
• However, teleconferencing does
remove the inter-personal relationships
that are built through real meetings
• A messaging system involves creation,
exchange, storage, and management
• Traditional messaging systems have
• telephone answering machines
• facsimile (fax) machines
• More recent messaging systems
• voice mail
• instant messaging
• electronic mail
• Voice mail allows people to receive,
store, manage and retrieve messages
sent to their phone
• It is useful because more people have
access to their phone than a computer
• Lately, voice mail has been superseded
by instant messaging services.
• Instant messaging allows short
messages of text, images and video to
be sent via computer or phone.
• Email is a fast, economical and
convenient way to send messages
• Email addresses are unique and made
up of two parts separated by an @
• The first part is the user name and the
second part is domain name.
• The domain name specifies the server
where the person’s email messages are
• Email messages have two main parts:
• the header
• the body
• The header contains the address,
carbon copy (Cc), blind carbon copy
(Bcc) and the subject of the message
• The body contains the text to be sent.
• Once people receive a message they
can reply or forward the message
• Attachments can also be added to
emails to allow the sending of files,
images, programs and video.
• Electronic commerce (e-commerce) is
the buying and selling of goods and
services across the Internet and the
transfer of money.
• It can include:
• electronic banking
• online auctions
• Internet shopping
• various ‘deal’ sites
• For any of these items to function
effectively they need strong security
and encryption, reliable backups and
HSC IPT - Topic 3: Communication - Section 3.2: Examples of Communication Systems