Wireless & Mobile Communications Multiple Choice Questions on “AMPS and ETACS”.
1. US cellular telephone system, AMPS stands for __________
a) Analog Mobile Phone System
b) Analog Modulation Packet System
c) Analog Machine Precision System
d) Analog Mobile Precision System
Answer: a
Clarification: AMPS stands for Analog Mobile Phone System. It was first deployed in late 1983 in urban and suburban areas of Chicago by Ameritech.
2. Who developed the first US cellular telephone system called AMPS?
a) Motorola
b) Ericsson
c) AT & T Bell Laboratories
d) ETSI
Answer: c
Clarification: In the late 1970s, AT & T Bell Laboratories developed the first US cellular telephone system called the Advanced Mobile Phone System (AMPS). In 1983, a total of 40 MHz of spectrum in the 800 MHz band was located by the Federal Communication Commission for AMPS.
3. The AMPS system uses a ___________ cell reuse pattern.
a) One
b) Five
c) Three
d) Seven
Answer: d
Clarification: The AMPS system uses a seven cell reuse pattern. It also provides sectoring and cell splitting to increase capacity when needed.
4. Which of the following is virtually identical to AMPS?
a) ETACS
b) GSM
c) CDMA
d) IS-54
Answer: a
Clarification: ETACS is virtually identical to AMPS. It was developed in middle 1980s and stands for European Total Access Communication System.
5. AMPS and ETACS use ___________ and _____ for radio transmission.
a) FM, TDD
b) FM, FDD
c) AM, TDD
d) FM, FDD
Answer: b
Clarification: Like all other first generation, analog, cellular systems, AMPS and ETACS use frequency modulation (FM) and frequency division duplex (FDD) for radio transmission.
6. US AMPS system provides 42 control channel for each of the two service providers.
a) True
b) False
Answer: b
Clarification: In the US AMPS system, there are twenty one control channels for each of the two service providers in each market. However, ETACS supports forty two control channels for a single provider.
7. In each cellular market, the non wireline service provider is assigned an odd SID.
a) True
b) False
Answer: a
Clarification: In each cellular market, the non wireline service provider (the ‘A’ provider) is assigned an odd SID (system identification number). The wireline provider (the ‘B’ provider) is assigned an even SID.
8. ETACS use ___________ instead of SID (system identification number).
a) Area identification number
b) Analog identification number
c) Digital identification number
d) Dual identification number
Answer: a
Clarification: For ETACS, area identification numbers (AIDs) are used instead of SIDs. ETACS subscriber units are able to access any control or voice channel in the standard.
9. _________ allows base and mobile to distinguish each other from co-channel users located in different cells.
a) SAT
b) VMAC
c) MAC
d) FVC
Answer: a
Clarification: The SAT (supervisory audio tone) has one of the three different frequencies which allow the base and mobile to distinguish each other from co channel users located in different cells.
10. AMPS and ETACS use same physical channels for transmission of voice and control channels.
a) True
b) False
Answer: b
Clarification: AMPS and ETACS use different physical rate channels for transmission of voice and control channels. A control channel is used by each base station in the system to simultaneously page subscriber units to alert them of incoming calls.
11. To increase the capacity of AMPS, Motorola developed ____________
a) P-AMPS
b) N-AMPS
c) H-APMS
d) R-AMPS
Answer: b
Clarification: To increase capacity in large AMPS markets, Motorola developed an AMPS like system called N-AMPS (narrowband AMPS) in 1991. N-AMPS did not become widespread as 2G digital technologies displaced many of the original FM analog systems.
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