Week 6- Unbounded media and wireless technology

Today, Dr. Dayang taught us about unbounded/unguided media and wireless technology.

Unbounded media

·                     No physical connection is required.

·                     Space or air is the transmission medium for electromagnetic waves.

·                     Source and destination can be static or mobile.

·                     Broad spectrum from low to high bandwidth is available.

·                     Can be quickly implemented.

After that , Dr. Dayang asked us to find the information about radio frequency (RF) and cellular phone.

radio frequency (RF)

Radio frequency is any frequency within the electromagnetic spectrum associated with radio wave propagation. When an RF current is supplied to an antenna, an electromagnetic field is created that then is able to propagate through space. Many wireless technologies are based on RF field propagation.

cellular phone

A mobile phone (also known as a cellular phone, cell phone and a hand phone) is a device that can make and receive telephone calls over a radio link whilst moving around a wide geographic area. It does so by connecting to a cellular network provided by a mobile phone operator, allowing access to the public telephone network.

Wireless technology

Next,we learn about wireless technology. Wireless telecommunications is the transfer of information between two or more points that are not physically connected. Distances can be short, such as a few metres for television remote control, or as far as thousands or even millions of kilometres for deep-space radio communications.It is a term used for mobile IT equipment. It is encompasses cellular phones, personal digital assistants (PDA’s) and wireless wiring. Other examples of wireless technology include GPA units, garage door openers and or garage door, wireless computer mice and keyboards, satellite television and cordless telephones.  

Here is a table to compare and contrast between 3G and 4G wireless technology.

	3G	4G
Technology Used	WDM.A EVDO HSP	LTF Wi Max
Speed	600 KB per sec 1.4 MB per sec (downlink) 5.8 MB per sec (uplink)	10 times faster than 3G 3.6 MB per sec (downlink)
Switching Type	Circuit switching	Packet switching

As always, here is a video for all of you to enjoy. Thanks for reading the post ^^.