Question 1

_____________ is (are)generated by "overlaying" on an oscilloscope all the digital bit signals received.

Accepted Answer

A)  Eye patterns
B)  Impedance
C)  Digital pulses
D)  Noise on the pulse A

Question 2

The ______ for almost all telephone transmissions is a two-wire twisted-pair cable.

Accepted Answer

A)  local loop
B)  cable infrastructure
C)  trunk line
D)  loopback A

Question 3

____________ occurs when calls are unable to reach their destination as a result of excess demand for system capacity.

Accepted Answer

A)  Delay distortion
B)  Switching
C)  Congestion
D)  Attenuation distortion C

Question 4

What is the primary function of the private branch exchange (PBX)?

Accepted Answer

A)  Switching one telephone line to another
B)  To meet the increasing demands of data transmission
C)  To meet the economic objectives of providing service
D)  To maintain order during the interchange of data

Question 5

The connection paths for telephone service were all initially designed for what type of transmission?

Accepted Answer

A)  Electronic
B)  Digital
C)  Wireless
D)  Voice

Question 6

___________ involves conveying two or more information signals over a single transmission channel.

Accepted Answer

A)  Transitioning
B)  Framing
C)  Synchronizing
D)  Multiplexing

Question 7

The measure of calls lost during a busy hour period is known as _____________.

Accepted Answer

A)  grade of service
B)  congestion
C)  holding time
D)  traffic measurement

Question 8

Regardless of whether signals are modulated or not,what must first happen to data?

Accepted Answer

A)  It must be sequenced.
B)  It must be controlled.
C)  It must be coded.
D)  It must be framed.

Question 9

Who provides the switch for the frame relay network?

Accepted Answer

A)  Subscribers
B)  FCC
C)  Computer services
D)  Commercial carriers

Question 10

What causes transmitted data to be routed back to the originating location by the receiver or,in telephone and wireline data systems?

Accepted Answer

A)  Signaling systems
B)  Packet switching
C)  Virtual path connection
D)  Loopback capability

Question 11

Everything facing back to the customer side from the demarc is the customer's responsibility,whereas all equipment and connections facing back toward the carrier side is the carrier's responsibility. What does this statement represent?

Accepted Answer

A)  Point of presence
B)  Loopback
C)  Sequence control
D)  Handshaking

Question 12

What type of control keeps message blocks from being lost or duplicated and ensures that they are received in the proper sequence?

Accepted Answer

A)  Line
B)  Sequence
C)  Flow
D)  Character

Question 13

A square-wave signal is a digital ______________.

Accepted Answer

A)  waveform
B)  circuit
C)  transmission
D)  distortion

Question 14

A __________ is a packet switching network designed to carry data traffic over a public data network (PDN).

Accepted Answer

A)  frame relay
B)  trunk
C)  local loop
D)  loopback

Question 15

What is the purpose of framing?

Accepted Answer

A)  To maintain synchronization of the receiving equipment
B)  To allow one computer to "speak" with another
C)  To meet the increasing demands of data transmission
D)  To separate two-wire subscriber loops into two-wire pairs for transmitting and receiving

Question 16

What type of effect does noise have on a signal?

Accepted Answer

A)  Harmonic
B)  Distorted
C)  Additive
D)  Amplified

Question 17

Which of the following is a set of rules designed to force the devices sharing a channel to observe orderly communications procedures?

Accepted Answer

A)  Framing
B)  Public data network
C)  Handshaking
D)  Protocol

Question 18

What is the busiest day of the week for telephone traffic?

Accepted Answer

A)  Sunday
B)  Monday
C)  Saturday
D)  Friday

Question 19

Which of the following is the standard carrier system in North America?

Accepted Answer

A)  MUX
B)  T carrier
C)  E carrier
D)  TDMA

Question 20

Which of the following do line codes enable?

Accepted Answer

A)  Communication in both directions
B)  Error detection
C)  Traffic measurement
D)  Traffic capacity

Exam 9: Telephone Networks

_____________ is (are) generated by "overlaying" on an oscilloscope all the digital bit signals received.