Network Media

• Guided Media( transmit the data over a wire)– Twisted Pair Cable– Coaxial Cable– Fiber Optic

• Unguided Media( Transmits the data through air)– Satellite Transmission – Microwave Transmission

Advantages & Disadvantage of twisted Pair

Advantage:• It supports analog as well as digital

transmission• Inexpensive transmission mediaDisadvantages:

- Noise prone- Transmission limits

Advantages & Disadvantage of Coaxial Cable

Advantages:• High transmission rate• Higher noise immunityDisadvantages:- comparatively costly- security problem

Fiber Optics

• Advantages:- high transmission rate - better noise immunity- it can transmit the data at longer distance- more data security- high transmission quality

Fiber optic (disadvantages)

• Expensive• Difficult to configure• Expensive maintenance

Advantages of Satellites

• The advantages of satellite communication over terrestrial communication are: The coverage area of a satellite greatly exceeds

that of a terrestrial system. Transmission cost of a satellite is independent of

the distance from the center of the coverage area. Satellite to Satellite communication is very precise. Higher Bandwidths are available for use.

Basics: Disadvantages of Satellites

• The disadvantages of satellite communication: Launching satellites into orbit is costly. Satellite bandwidth is gradually becoming used up. There is a larger propagation delay in satellite

communication than in terrestrial communication.

Advantages Fiber Optic

• SPEED: Fiber optic networks operate at high speeds - up into the gigabits• BANDWIDTH: large carrying capacity• DISTANCE: Signals can be transmitted further without needing to be "refreshed" or strengthened.• RESISTANCE: Greater resistance to electromagnetic noise such as radios, motors or other nearby cables.• MAINTENANCE: Fiber optic cables costs much less to maintain.

Microwave Transmission

• Microwave signals are also used to transmit the data & voice over the long distances through air without wires. In microwave transmission directional parabolic antennas are used to transmit the signals. Repeater are installed for sending and receiving signals along a line of sight.

Advantages & Disadvantages

Advantages:• It involves less costly technology as compared

to satellite• Its transmission rate is high than twisted pair,

coaxial and fiber optic cablesDisadvantages- Difficult to maintain repeaters- Signal noise