TRUE/FALSE
1. AMPS was the original mobile phone system in America.
ANS: F
2. AMPS is an analog system.
ANS: T
3. AMPS is a circuit-switched system.
ANS: T
4. Originally, only one carrier was allowed to operate an AMPS system in any given region.
ANS: F
5. High path loss makes it easier to reduce interference in a cellular system.
ANS: T
6. Adjacent cell sites usually have some overlap.
ANS: T
7. Portable handheld cell phones have a maximum ERP of 4 watts.
ANS: F
8. All cell sites in a region are connected to a central office.
ANS: T
9. AMPS provides for direct cell phone-to-cell phone connection.
ANS: F
10. AMPS reuses frequencies over a relatively short distance.
ANS: T
11. AMPS uses narrowband FM.
ANS: T
12. With AMPS, each individual cell uses all available voice channels.
ANS: F
13. Besides voice channels, AMPS uses a set of control channels.
ANS: T
14. In AMPS, some control functions are done over the voice channels.
ANS: T
15. Paging signals are sent over voice channels in AMPS.
ANS: F
16. For efficient handoff, an optimum cell-site radius is a bit less than 0.5 km.
ANS: F
17. With AMPS, a cell phone can receive a voice channel and a control channel simultaneously.
ANS: F
18. "Blank-and-burst" control signaling is done over the voice channel.
ANS: T
19. There is no encryption in AMPS.
ANS: T
20. The MIN represents the 10-digit phone-number of the cell phone.
ANS: T
21. The MIN is stored in the NAM.
ANS: T
22. If used, the ESN must be keyed in by the cell phone user.
ANS: F
23. Both the ESN and the MIN are required for proper billing.
ANS: T
24. The power a cell phone transmits is controlled by the land station.
ANS: T
25. It is possible to have a "collision" when two cell phones try to use the same control channel at the same time.
ANS: T
26. The DCC is used to tell a cell phone it is "roaming".
ANS: F
27. With AMPS, handoffs always involve a change in the voice channel.
ANS: T
28. With AMPS, handoffs result in a 100-msec interruption of the voice signal.
ANS: T
29. The AMPS system was designed to ensure privacy.
ANS: F
30. It is relatively easy to "clone" an AMPS cell phone.
ANS: T
31. The AMPS system is full-duplex.
ANS: T
32. Analog cell phones require linear RF amplifiers.
ANS: F
33. The optimum size of a cell depends on the amount of traffic.
ANS: T
34. Calls can never be blocked on a cell phone.
ANS: F
35. Calls can be "dropped" when a cell phone moves into another cell.
ANS: T
36. Capacity can be increased by using fewer cells.
ANS: F
37. Digital data cannot be sent over an AMPS system.
ANS: F
38. Digital cellular systems actually use less bandwidth than analog systems.
ANS: T
39. Digital cellular systems in North America use the same frequencies, power levels, and channels as AMPS.
ANS: T
40. Privacy using the digital cellular system is much better than using AMPS.
ANS: T
MULTIPLE CHOICE
1. AMPS stand for:
| a. | American Mobile Phone System | c. | Advanced Mobile Phone System |
| b. | Analog Mobile Phone Service | d. | Advanced Mobile Phone Service |
ANS: D
2. PCS stands for:
| a. | Personal Communications Service | c. | Personal Cell phone Service |
| b. | Personal Communications Systems | d. | Portable Communications Systems |
ANS: B
3. RCC stands for:
| a. | Radio Common Carrier | c. | Regional Cellular Carrier |
| b. | Radio Cellular Carrier | d. | none of the above |
ANS: A
4. MSC stands for:
| a. | Mobile Switching Center | c. | Maximum Signal Carrier |
| b. | Mobile Service Cellular | d. | Minimum Signal Carrier |
ANS: A
5. MTSO stands for:
| a. | Minimum Transmitted Signal Output | c. | Mobile Telephone Switching Office |
| b. | Maximum Transmitted Signal Output | d. | Mobile Transmission Time-Out |
ANS: C
6. MIN stands for:
| a. | Manual Identification Number | c. | Maximum In-band Noise |
| b. | Mobile Identification Number | d. | Minimum In-band Noise |
ANS: B
7. NAM stands for:
| a. | Numerical Access Mode | c. | Number Access Module |
| b. | Numerical Assignment Mode | d. | Number Assignment Module |
ANS: D
8. ESN stands for:
| a. | Electronic Serial Number | c. | Emission Strength Number |
| b. | Emitted Signal Number | d. | none of the above |
ANS: A
9. SCM stands for:
| a. | Service Class Mark | c. | Signal Class Mark |
| b. | Station Class Mark | d. | Serial-Code Mode |
ANS: B
10. SCM identifies the:
| a. | code number of a cell phone | c. | signal classification (analog or digital) |
| b. | base-station class | d. | maximum power level of a cell phone |
ANS: D
11. SID stands for:
| a. | Sequential Interrupt Demand | c. | System Identification Number |
| b. | Standard Identification Number | d. | Signal Intensity Descriptor |
ANS: C
12. The SID is used by a cell phone to:
| a. | identify the type of system (analog or digital) |
| b. | recognize an AMPS system |
| c. | set its transmitted power level |
| d. | recognize that it is "roaming" |
ANS: D
13. DCC stands for:
| a. | Digital Color Code | c. | Digital Communications Carrier |
| b. | Digital Communications Code | d. | Direct Channel Code |
ANS: A
14. SAT stands for:
| a. | Station Antenna Tower | c. | Supervisory Access Tone |
| b. | Supervisory Audio Tone | d. | none of the above |
ANS: B
15. CMAC stands for:
| a. | Control Mobile Attenuation Code | c. | Central Mobile Access Control |
| b. | Control Mobile Access Code | d. | Carrier Mode Attenuation Control |
ANS: A
16. The CMAC is used to:
| a. | control access to the cell site |
| b. | set the access code of the cell phone |
| c. | set the transmit power of the cell phone |
| d. | select the transmit channel for the cell phone |
ANS: C
17. In an AMPS system, voice is sent using:
| a. | AM | c. | FSK |
| b. | FM | d. | CDMA |
ANS: B
18. In an AMPS system, control-channel signals are sent using:
| a. | AM | c. | FSK |
| b. | FM | d. | CDMA |
ANS: C
19. The ERP of a typical handheld AMPS cell phone is:
| a. | less than 600 mW. | c. | between 1 and 2 watts |
| b. | less than 600 mW. | d. | 4 watts |
ANS: B
20. BSC stands for:
| a. | Base Station Controller | c. | Basic Service Contract |
| b. | Base Signal Controller | d. | Basic Service Code |
ANS: A
21. The combination of the mobile cell phone and the cell site radio equipment is called the:
| a. | BSC | c. | RF interface |
| b. | MTSO | d. | air interface |
ANS: D
22. The optimum cell-site radius is:
| a. | 2 km | c. | as small as possible |
| b. | 0.5 km | d. | none of the above |
ANS: D
23. Phone traffic is measured in:
| a. | calls | c. | number of users |
| b. | erlangs | d. | number of blocked calls |
ANS: B
24. One way to increase the capacity of a cell phone system is:
| a. | increase the number of cells | c. | increase the ERP |
| b. | decrease the number of cells | d. | decrease the ERP |
ANS: A
25. CDPD stands for:
| a. | Code-Division Packet Data | c. | Coded Digital Packet Data |
| b. | Cellular Digital Packet Data | d. | Cellular Digital Pulse Data |
ANS: B
COMPLETION
1. AMPS uses the ____________________-MHz band.
ANS: 800
2. ____________________ is still the most common cellular phone system in North America.
ANS: AMPS
3. Frequency ____________________ is what makes cellular phone systems complex.
ANS: reuse
4. A ____________________ occurs when an in-use cell-phone moves from one cell site to another.
ANS: handoff
5. If a cell-site radius drops below ____________________ km, handoffs will occur too frequently.
ANS: 0.5
6. The number of ERP classes in AMPS is ____________________.
ANS: three
7. A cell phone permanently installed in a car would be ERP class ____________________.
ANS:
I
one
8. The maximum ERP of class III cell phones is ____________________.
ANS: 600 mW
9. A portable, handheld cell phone would be ERP class ____________________.
ANS:
III
three
10. Mobile transmitter power is controlled by the ____________________.
ANS: land station
11. A MAC is a mobile ____________________ code.
ANS: attenuation
12. For security, you should always assume that AMPS transmissions are ____________________.
ANS: public
13. A mobile switching center is also called an ____________________.
ANS: MTSO
14. The optimum size of a cell site depends on the amount of ____________________.
ANS: traffic
15. Telephone call traffic is measured in ____________________.
ANS: erlangs
16. A cell phone moving into a site with no available frequencies will have a ____________________ call.
ANS: dropped
17. The reduction in cell size to increase traffic is called cell ____________________.
ANS: splitting
18. A ____________________ site is a very small unit that can mount on a streetlight pole.
ANS: microcell
19. Very small cells called ____________________ are used for reliable indoor reception.
ANS: picocells
20. Compared with AMPS, digital cellular phones require ____________________ bandwidth.
ANS: less
SHORT ANSWER
1. Give two reasons why digital cell phone systems are more secure than analog cell phone systems.
ANS:
1. Digital is inherently more secure because of its format.
2. Digitized voice signals are easily encrypted.
2. If a 28.8-kbps modem is being used over a cell phone, how many words of text would be lost during a 100-msec handoff interruption assuming 10 bits per letter and 5 letters per word?
ANS:
57.6
3. A certain cell site contains 200 cell phones. The probability that a given cell phone is being used is 15%. What is the traffic in erlangs?
ANS:
30
4. What is "trunking gain"?
ANS:
For a given probability of being blocked, the maximum allowable traffic per channel increases as the number of channels increases.
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