1. Guided and Unguided Media
All types of communications need some kind of medium.
The information is encoded in a signal that is carried through a medium.
Quality depends on the characteristics of the medium.
Two main groups of transmission media, namely the guided medium and the wireless medium.
UTM, 23 May 2012

2. Guided and Unguided Media
For the guided medium, there is a physical path (such as a cable) for electromagnetic wave propagation.
For the wireless medium, the electromagnetic wave is transmitted through air, water, or vacuum (space).
A wireless medium is also called an unguided medium.
UTM, 23 May 2012

3. Wireless Network Features
Wireless networks are treated as having more vulnerabilities than wired networks because of their
shared nature
naturally broadcasted states
unclear perimeters
invisible access
UTM, 23 May 2012

4. What other “Wireless”? 4G Wireless Networks
In telecommunications, 4G is the fourth generation of cell phone mobile communications standards. It is a successor of the third generation (3G) standards.
4G system provides mobile ultra-broadband Internet access, for example to laptops with USB wireless modems, to smartphones, & to other mobile devices.
Conceivable applications include amended mobile web access, IP telephony, gaming services, high-definition mobile TV, video conferencing, 3D television.
UTM, 23 May 2012