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                                   CHAPTER THREE ANSWERS TO REVIEW QUESTIONS
 

 1. Conducted media is media, which can be touched physically, and radiated media is media that cannot be seen readily.

 2. The category of UTP with the greatest data-carrying capacity is Category 5 UTP.

 3. A company would want to lease T-carrier circuits because T-carriers are used to transmit digital data over long distances.

 4. Broadband cable is used to transmit many signals on the same cable (such as for cable television). Baseband cable transmits a single signal. Coaxial cable is used for both cables.

 5. Fiber-optic cable allows faster transmission of data. light is used to transmit data instead of electricity, thus fiber-optic cable is not prone to electrical interference.

 6. The three types of fiber-optic cable currently available are: multimode step index, multimode graded index , and single-mode. The fastest fiber-optic cable is single-mode.

 7. Four types of broadcast radio are listed in this chapter; Amplitude Modulation (AM) radio, Frequency Modulation (FM) radio, shortwave radio, and citizens band (CB) radio.

 8. Broadcast radio is considered to be omnidirectional because the antenna used to receive the signal does not have to be placed in a specific direction.

 9. The difference between terrestrial microwaves and satellite microwaves is in the location of the antennae. The antennae for terrestrial microwave are located on the earth. The antennae for satellite microwave are located in space.

 10. In a straight line.

 11. Frequency hopping spread spectrum radio (SSR) broadcasts a signal over a seemingly random series of radio frequencies. Direct sequence spread spectrum distributes the signal over several frequencies simultaneously. SSR is used for wireless LANs.

 12. A footprint.

 13. Propagation delay is the amount of time it takes a signal to travel from the earth to a satellite and from the satellite back down to the earth. The delay for data transmission is .5 seconds and for voice transmission is 3 seconds.

 14. Transponder – the part of the satellite that transmits.
  Uplink – transmission from the earth up to the satellite.
  Downlink – transmission from the satellite down to the earth.

 15. A geosynchronous orbit means the satellite is in a fixed spot above the earth. To achieve this type of orbit, the satellite is placed 22,300 miles above the equator. The difference between LEOS, MEOS and GEOS is in the position each satellite is placed above the earth.
  LEOS – low earth orbiting satellite positioned 325 to 1,000 miles up.
  MEOS – medium earth orbiting satellite positioned 6,000 to 10,000 miles up.
  GEOS – geosynchronous orbiting satellite positioned 22,300 miles up.

 16. Cellular.

 17. Twisted pair is the least expensive conducted medium, while fiber-optic cable is the most expensive.

 18. Fiber-optic is the medium with the capabilities to transmit data the fastest.

 19. Weather (snow, fog), sunspots, and other microwave signals may cause errors in microwave transmissions.

 20. Fiber-optics is the most secure medium.