Deck 12: Phone Networks

Question 1

The phone network is also called the POTS,which stands for _____.

A)Plain Old Telephone Service
B)Planned Obsolescence Telecommunication Service
C)Plain Out-of-Fashion Telecommunication System
D)People's Open Telephone Structure

Answer 1

A

Question 2

The most important contribution of the Telecommunications Act of 1996 was that it _____.

A)created the seven RBOCs
B)limited AT&T's monopoly in providing long distance phone service
C)was the result of an anti-trust lawsuit filed by the U.S.Government against AT&T
D)created competition in local phone service

Answer 2

D

Question 3

The phone system transmits signals in the range _____.

A)520 kHz - 1,610 kHz
B)87.5 MHz - 108.0 MHz
C)2)44 GHz - 2.46 GHz
D)300 Hz - 3,400 Hz

Answer 3

D

Question 4

In the early years of the 20^th century,the phone network in the US operated as a _____.

A)regulated monopoly
B)regulated duopoly
C)competitive industry
D)regulated oligopoly

Question 5

Once a connection is established using circuit switching,the communicating devices at the two ends of the circuit _______________ for the duration of the connection.

A)share the circuit with neighboring users
B)are connected on an as needed basis
C)are connected on a round-robin basis
D)have exclusive use of the circuit

Question 6

In circuit switching,communicating devices are connected _____.

A)all the time
B)most of the time
C)on demand
D)None of the above

Question 7

The first widely used network to obtain Internet access in homes was _____.

A)the phone network
B)Ethernet
C)ATM
D)frame relay

Question 8

Cell phone systems divide the coverage area into cells because _____.

A)cell phone signals cannot be transmitted beyond the range of a typical cell
B)it keeps the heights of cell towers within permissible limits
C)this enables frequency reuse
D)this is required for regulatory compliance

Question 9

In the phone network,the local loop is _____.

A)shared by all users of the end office
B)shared by users in a neighborhood
C)dedicated to a single user
D)dedicated to business customers

Question 10

The unit of frequency is _____.

A)volts
B)degrees
C)hertz
D)angstrom

Question 11

As a result of frequency reuse,the cell phone system _____.

A)becomes more expensive
B)can operate with shorter towers
C)does not need to use encryption
D)can support as many subscribers as necessary using the limited bandwidth available

Question 12

In the phone network,the interexchange carrier link is _____.

A)shared by users in a neighborhood
B)shared by all users of the end office
C)dedicated to a single user
D)dedicated to business customers

Question 13

In the phone network,end users are connected to each other using _____.

A)packet switching
B)circuit switching
C)routing
D)MPLS

Question 14

The seven local phone companies created as a result of the modified final judgment of 1984 were called _____.

A)Lucent
B)The Regional Bell Operating Companies
C)Bell Labs
D)Verizon

Question 15

In the phone network,interexchange carriers are _____.

A)networks that carry traffic between end offices
B)parcel services that help exchange traffic information between carriers
C)devices that provide the customer's dial tone
D)the links that carry signals from the end office to the customer's premises

Question 16

The technology developed by phone companies to offer basic high-speed data service over existing phone wires was _____.

A)DSL
B)SONET
C)T-1
D)T-3

Question 17

All of the following are true of the modified final judgment of 1984,except _____.

A)it created the seven RBOCs
B)it limited AT&T's monopoly in providing long distance phone service
C)it created competition in local phone service
D)it was the result of an anti-trust lawsuit filed by the U.S.Government against AT&T

Question 18

In the phone network,the local loop is the _____.

A)circuit between the phone company's last switch and the local billing office
B)circuit from the customer's premises to the nearest switch in the phone company's network
C)the phone technician's repair route
D)network inside the customer's premises

Question 19

Typically in DSL _____.

A)downstream data rates are the same as upstream data rates
B)downstream data rates are higher than upstream data rates
C)downstream data rates are lower than upstream data rates
D)None of the above

Question 20

In the phone network,the end office is the location from where the phone company _____.

A)sends the customer's bills
B)provides customer service
C)manages its own network
D)provides the customer's dial tone

Question 21

In the cell phone system,conversations are switched to the most suitable tower by the _____.

A)mobile telephone switching office MTSO)
B)end office
C)central office
D)base station

Question 22

The major development in 2-G cell phone systems compared to 1-G cell phone systems was the _____.

A)use of digital signals instead of analog signals
B)use of CDMA instead of FDM
C)ability to offer very high data rates
D)use of CDMA instead of TDM

Question 23

The major advantage of CDMA over TDM and FDM is that _____.

A)CDMA is simpler to implement than TDM or FDM
B)CDMA combines the benefits of TDM and FDM
C)CDMA can support many more users using the same network resources than TDM or FDM
D)None of the above

Question 24

The multiplexing method used by 3-G cell phone systems is _____.

A)time division multiplexing TDM)
B)frequency division multiplexing FDM)
C)orthogonal frequency division multiplexing OFDM)
D)code division multiplexing access CDMA)

Question 25

In a cell phone system,the process of transferring a call from one tower to another is called _____.

A)routing
B)handoff
C)switching
D)None of the above