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Wednesday, July 24, 2013

PPT On Transmission Media

Presentation On Transmission Media

Transmission Media Presentation Transcript:
1.Transmission Media

2.Classes of Transmission Media

3.Transmission Cable
The bounded media types are wires or network cables.
Signals travels through a physical shielded on the outside (bounded) by some materials. --- bounded media.
Characteristics of each cable type includes :
Cost : cost can be imp when deciding network cable. Ex. Fiber optic – extremely expensive
Installation : fiber optic cable – highly skilled technician to install. If on contract – the installation cost may overweight the actual cost.
Capacity / Bandwidth : cable speed – bandwidth, A bandwidth that cable can accommodate is determined by the cable’s length.

4.Short cable – accommodate greater b.w. than a long cable.
Measured in Mbps – Mega bit per seconds, MBps – Mega Byte per seconds, std. ethernet cable is usually 10 Mbps.
Band Usage
Base Band : Base band transmissions use the entire bandwidth to transmit one signal at a time. Signals can be bidirectional.
Frequently used in LANs – can be used with analog signals. --- limit of 2 km in cable length.
Broad Band : Bandwidth is divided into multiple channels – allows multiple transmissions at once.

5.Less susceptible to attenuation and can transmit farther than baseband.
Signals can be one directional – dual cable configuration uses one cable to transmit and  other to receives.
Split cable configuration -- uses same cable but different frequencies to transmit signals in both directions.
Used only by Analog signals.
Attenuation : fading of the electrical signals over distances
Unable to distinguish b/w the real signals and induced noise after a certain distance.
A measure of flow how much signals weakens as it travels.


7.Immunity from Electromagnetic Interference :
How well the cable  holds up against interference, EMI – consists of outside Electromagnetic noise that distorts the signals in a medium.
Cross Talk : Kind of interference use by adjacent wires – occurs – signals from one wire is picked up by another wire.

8.Coaxial Cable
Coaxial cable gets its name – two conductors that are parallel to each other , or on the same axis.
Support 10 to 100 Mbps of bandwidth.
Components of coaxial cables
Central Conductor : Usually solid copper wire, made up of stranded wire.
Outer conductor : consists of braided wires, metallic foil or both – shield – serves as ground – protects the inner conductor from EMI.
Insulation layer : keeps the outer conductor spaced from the inner conductor.

9.Coaxial Cable

10.Plastic encasement (jacket) : protects the cable from damage.
Single cable failure can take down an entire network down. one piece of cable is break, the entire segment will stop working
Categories of coaxial cables.

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