Answer the following review questions in short/brief sentences: 1. Why is twiste

Question

Answer the following review questions in short/brief sentences:

1. Why is twisted pair wire called twisted pair?

2. How does crosstalk occur in twisted pair wire?

3. For what purposes are Category 5e, 6, and 7 twisted pair wire used?

4. What are the advantages and disadvantages of shielded twisted pair?

5. What is the primary advantage of coaxial cable compared to twisted pair?

6. What is the difference between baseband coaxial and broadband coaxial cable?

7. Why is fiber-optic cable immune to electromagnetic interference?

8. What are the advantages and disadvantages of fiber-optic cable?

9. What is the difference between terrestrial microwave and satellite microwave?

10. What is an average distance for transmitting terrestrial microwave?

11. What kind of objects can interfere with terrestrial microwave transmissions?

12. List a few common applications for terrestrial microwave.

13. What are the four orbit levels for satellite systems?

14. List a few common application areas for each orbit level satellite system.

15. What is the sequence of events that happens when someone places a call from a cell

phone?

Explanation / Answer

1) since the twisted pair wire in two ormore pairs of one conductor copper wires which are twisted over all one another.

2) because the electromagnetic radiation released from one wire, that is picked up through a second wire .moreover the the wire pairs are twisted ,crosstalk doesnot occur in reality.but is supposed if wiresa re parallel the crosstalk may rises.if wires are perpendicular the crosstalk reduces.Anyway they are unable to generate the twisting of two wired around with one another ,finally keeps the wires running parallely which assists to decrease the crosstalk.

3)cate5: it is outlined to transmit a data of 100 mbs at a distance of 100 meters.

6: to assist the data signal at 200 mhz at a distance of 100 meters

7: to assist 600 mhz of bandwidth at 100 meters distance.

4)Advantages:1.it offers a preferable level of isolation from interference .

2.this kind of scheduling is cheap.

Disadvatages: 1.price is a major disadvatage.

2.they have a surcharge cost

5) it is able to transfer signals through a extreme range of frequencies so that the noise is little.

6) Baseband : 1.utilizes the digital signaling

2.they are with 50 ohms for digital transmission

Broadband co_Axialcable:1.analog signal is utilized for transmission of signal with 75 ohms.

7)yes the fibre optic cable is immune to electromagnetic transmission .they are unable to establish their own EMI.Additionally it is immune to RFI.

8) Advantages: 1.Installation is simple.

2.they don't generate the sparks

Disadvantages: 1.data transmission is terrifically quick.

2.High cost when compared to broad band connection.

9)terrestiral microwave have the ability to transfer high amount of data in digital and analog at large speed.

satelite communication are same as terestial microwave excluding the signals from ground station on earth.

10) nearly 20 to 25 miles ,based on itervening obstacles.several microwave antennas are located on the peak of free standing towers ,the normal distance among microwave towers is nearly 15 to 30 miles ,hence towers found on the mountains are able to transmit signals longer than 30 miles.

11)buildings

hills

snowfalls

forests are the objects can interfer with terestial microwave transmissions.

12) telephone communication

business intercommunication

13) 1.Low earth orbit(LEO)

2.Middle earth orbit(MEO)

3.Geosynchronous earth orbit(GEO)

4.Highly elliptical orbit(HEO)

14) LEO: Video conferencing

remote sensing

spying

MEO : Communication

navigation

HEO: communication satelites

GEO: orbital stability

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