Internet technology

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Chapter 10 Internet Technology
Electronic Mail
A system that allows users to send messages between each other via computers
on a network, messages can e sent to internal or external networks.
An email has a header:
Name and email address of sender and recipient
Date and time it was sent at
Subject of email
And a body:
Text of an email
Any Attachments sent
Advantages Disadvantages
Very Fast Spam emails
(Broadcasting) can be sent to more than one person Security very easy to send confidential files away
Recipient does not have to be online People receive 100s of emails per day
Accurate record of communication
Video Conferencing
Allows people to see and converse each other in real time using screens,
cameras and microphones. Typically delivered through high bandwidth communication
line, can link to more than one party across the globe.
Advantages Disadvantages
No travel saves time and money Equipment and Bandwidth lines are expensive
Can see recipient Body Language Relevant documents can not be passed around
Can be recorded for accurate record or meeting Technology Fail=meeting over
Mobile Telecommunications
Provide a wide number of benefits to businesses in many scenarios. It provides
more features of traditional voice calls.
Advantages Disadvantages
Directory and Caller ID Allows user to store an address book of contacts. This means users can browse this
contact list to save time typing in a full number
Short Messaging Sends information to a contact where a call is not needed, May contain 160
Service (SMS) characters. Used to provide premium rate services, such as television competition.
Multimedia Messaging Enhancement of SMS. Allow monger text messages to be sent, images and videos
Service (MMS)
Video Calling Very similar to webcam video conferencing i.e. Allows user to see each other but poor
quality video/sound.
Voicemail Development of traditional answering machines except message is saved on network
provider's server. Voicemail can record a message while the phone is in use.

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Equipment needed to access the internet
Hardware Software
Computer Dialup Software to comment to ISP (provided by
Modem/Router Web browser to display pages e.g. Firefox
Telephone Line Email packages e.g. MS Outlook
ISDN Adopter FTP client e.g. WSFTP
ADSL Adopter
Network Interface Card
Parts of an IP Address
An IP address is a 32 bit address, written in the format of 4whole numbers (0255)
separated by dots.
194.28.12.…read more

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Communication Technology
Integrated Services Digital Network (ISDN)
Allows you to connect to the internet and transmit data over copper cables.
Advantages Disadvantages
High Bandwidth Hardware must be installed by engineer
Internet and the phone can be used at the Fibre Optic Cables
same time
Offer same upload and download speed Expensive
Asynchronous Digital Subscriber line (ADSL)
Also called Broadband. ADSL carries a number of different signals (video/audio
etc) simultaneously over a single communication line.…read more

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Another example of a PAN technology designed for sensors or remote control
devices that transmit at intervals. It can be arranged as a mesh and has 3 types of
Zigbee Coordination (ZC)
Zigbee End Divice (ZED)
Zigbee Router (ZR)
Advantages Disadvantages
Consumes little power Not widely supported
If a router fails, signals can be rerouted Requires battery backup in critical
through network systems e.g.…read more


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