True/False
Indicate whether the sentence or statement is true
or false.
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1.
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Telephones usually contain a hybrid coil or an equivalent circuit.
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2.
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In a
telephone system, signal strength is given relative to the zero transmission loss
point.
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3.
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TDM
is being replaced by the newer FDM technology in telephone systems.
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Multiple Choice
Identify the
letter of the choice that best completes the statement or answers the question.
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4.
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PSTN
stands for: a. | Public Switched
Telephone Network | c. | Primary Service
Telephone Network | b. | Private Switched Telephone
Network | d. | Primary Service
Telephone Numbers | | | | |
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5.
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POTS
stands for: a. | Private Office
Telephone System | c. | Primary
Operational Test System | b. | Primary Office Telephone
Service | d. | Plain Old
Telephone Service | | | | |
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6.
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Call
blocking: a. | cannot occur in
the public telephone network | b. | occurs on the local loop when there is an electrical power
failure | c. | occurs only on long-distance cables | d. | occurs when the
central office capacity is exceeded | | |
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7.
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The
cable used for local loops is mainly: a. | twisted-pair copper wire | c. | coaxial cable | b. | shielded
twisted-pair copper wire | d. | fiber-optic | | | | |
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8.
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DC
current flows through a telephone: a. | when it is on hook | c. | as long as it is attached to a local
loop | b. | when it is off
hook | d. | only when it is
ringing | | | | |
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9.
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The
bandwidth of voice-grade signals on a telephone system is restricted in order to: a. | allow lines to
be "conditioned" | c. | allow signals to
be multiplexed | b. | prevent "singing" | d. | all of the above | | | | |
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10.
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ADSL
stands for: a. | All-Digital
Subscriber Line | c. | Allocated
Digital Service Line | b. | Asymmetrical Digital Subscriber
Line | d. | Access to Data
Services Line | | | | |
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