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What is a Medium?

Data, Medium and Signal

Types of mediums

Difference between Analog and Digital

Binary Digit (bit)

Operating Frequency

Media Selection considerations

Scenario 2

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Data is being transferred by a medium

using signals.

Mediums: Fiber Optic, Coaxial.. Etc.

Signals: Radio frequency, light.. Etc.

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Medium: Something that allows conveying a

message through and fore from a server &

client. Examples: air & cables.

Its purpose: To make sure that a data or

message is being delivered

Limitations: Speed, distance, environment

and cost

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Type Length Speed Cost Advantages Disadvantages

UTP 100m 10 mbps -1000 mbps

LeastExpensive

Easy to install,widely used andwidely available.

Limited distanceand susceptible tointerference

STP 100m 10 mbps -

100 mbps

Less

expensive than

UTP

More resistant to

EMI thanU

TP orCoaxial (Thinnet)

Limited distance

More difficult toinstall than UTP.

Coaxi

al

500m&

185m

10mbps

100 mbps

Relativel

yinexpensive

Less susceptible

to EMI than rest ofcopper medialike UTP

Damaged cable

can bring downentire network.Limited bandwidth

Fiber

Optic

10km &

2km

100mbps-

100gbps

10mbps-9.92gbps

Expensiv

e

Higher security,

High distance,Not susceptible to

EMI

Difficult to terminate

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Analogue signal differs from a digital signal,small fluctuations in the signal are meaningful.

Analogue signals use continuously variableelectric currents and voltages to reproducedata being transmitted while digital signals usebinary data strings (0 and 1) to reproduce databeing transmitted.

Digital signals are easier to transmit and offerless room for errors to occur while analoguehas higher room for errors to occur.

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A Binary Number is made up of only 0s and

1s.

BIT short for binary digit, which, in acomputer, is the smallest unit of storage.

In the computer world "binary digit" is often

shortened to the word "bit

" For the first 16 numbers:

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The amount of data sent can be

dependent on the operating frequency.

Example:

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Security

Cost

Distance

Speed

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You wantedto connectthe computingdevices locatedin two branches of acompany, 1km apart. (Security, cost,

distance, speed. Distance:1km (2km and farther Multimode)

Speed:100Mbps to 9.92 Gpbs (Multimode)

Cost:

Expensive Security:Cannot be tapped, thus it has better

security.

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http://www.skullbox.net/dva.php

http://www.ntt-

east.co.jp/isdn_e/e_page/e_faq02/faq003.html

http://wiki.answers.com/Q/What_is_the_

difference_between_digital_and_analog_signals

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THANKYOU