Question

what are Media Selection Criteria? Include in your descriptions Cost, Speed, Distance and expandability, Environment and Security. Why each criteria is important?

Answer 1

Solution

Media Selection Criteria

Media Selection Criteria that includes

1. Cost
2. Speed
3. Distance and expandability
4. Environment
5. Security

Cost

The various kinds of costs available in Media selection criteria are

1. Initial Cost
2. Maintenance Cost

Initial Cost

Initial cost means what does a particular kind of medium cost to purchase?

what does a particular kind of medium cost to install?

Maintenance Cost

Maintenance cost also known as Support Cost

Return on Investment(ROI)

If one medium is inexpensive to purchase & install but is not cost effective now the important question arise is that where are the savings

Speed

The 2 different types of speed is

1. Propagation Speed
2. Data Transfer Speed

Propagation Speed

Propagation speed means time to send the first bit across medium

Propagation speed depends upon the medium

Airwaves & fiber are speed of the light

Copper wire is considered two third of the speed of the light

Data Transfer speed

Data transfer speed the time to transmit the rest of the bits in the message

Data transfer speed measured in bps(bits per second)

Distance and expandability

There is certain types of media easily lend themselves to expansion

The important thing is to be considered is right of way issue for conducted media & line of sight for certain types of wireless media

Environment

There are many kinds of environments are dangerous to certain types of media

1. Electromagnetic noise
2. Scintillation
3. Movement
4. Extreme environmental condition

Security

The important thing is that data should be secured during transmission

It is very important that the medium not to be easy to tap

• Making the wire impervious to the electro-magnetic wire-tapping
• Encrypting the signal going over the medium

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all the best