Deck 9: Telephone Networks

Question 1

Which of the following is a set of rules designed to force the devices sharing a channel to observe orderly communications procedures?
A.Framing
B.Public data network
C.Handshaking
D.Protocol

Answer 1

Protocol

Question 2

____________ occurs when calls are unable to reach their destination as a result of excess demand for system capacity.
A.Delay distortion
B.Switching
C.Congestion
D.Attenuation distortion

Answer 2

Congestion

Question 3

Which of the following is the standard carrier system in North America?
A.MUX
B.T carrier
C.E carrier
D.TDMA

Answer 3

T carrier

Question 4

A square-wave signal is a digital ______________.
A.waveform
B.circuit
C.transmission
D.distortion

Question 5

Who provides the switch for the frame relay network?
A.Subscribers
B.FCC
C.Computer services
D.Commercial carriers

Question 6

A __________ is a packet switching network designed to carry data traffic over a public data network (PDN).
A.frame relay
B.trunk
C.local loop
D.loopback

Question 7

What type of effect does noise have on a signal?
A.Harmonic
B.Distorted
C.Additive
D.Amplified

Question 8

The CSU/DSU has three alarm modes for advising the user about problems on the link. What does a blue alarm indicate?
A.Failure in the link has been detected
B.Incoming signal has been corrupted
C.Total loss of incoming signal
D.Incoming signal has been detected

Question 9

What is the primary function of the private branch exchange (PBX)?
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 10

The connection paths for telephone service were all initially designed for what type of transmission?
A.Electronic
B.Digital
C.Wireless
D.Voice

Question 11

What is the purpose of framing?
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 12

Transmission of information in a communications link is defined by three protocol techniques: half duplex,full duplex,and __________.
A.asynchronous
B.framing
C.simplex
D.synchronous

Question 13

Which of the following do line codes enable?
A.Communication in both directions
B.Error detection
C.Traffic measurement
D.Traffic capacity

Question 14

___________ involves conveying two or more information signals over a single transmission channel.
A.Transitioning
B.Framing
C.Synchronizing
D.Multiplexing

Question 15

What type of control keeps message blocks from being lost or duplicated and ensures that they are received in the proper sequence?
A.Line
B.Sequence
C.Flow
D.Character

Question 16

The world's public switched telephone networks,both wireline and mobile,communicate with each other by means of a signaling protocol known as __________________.
A.private branch exchange (PBX)
B.Signaling System 7
C.public switched telephone network (PSTN)
D.public data network (PDN)

Question 17

Regardless of whether signals are modulated or not,what must first happen to data?
A.It must be sequenced.
B.It must be controlled.
C.It must be coded.
D.It must be framed.

Question 18

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?
A.Point of presence
B.Loopback
C.Sequence control
D.Handshaking

Question 19

_____________ is (are)generated by "overlaying" on an oscilloscope all the digital bit signals received.
A.Eye patterns
B.Impedance
C.Digital pulses
D.Noise on the pulse

Question 20

What part of the BORSCHT function applies for alerting the central office to on- and off-hook conditions?
A.Ringing
B.Supervision
C.Hybrid
D.Coding

Question 21

What type of cable is universally used by the phone company to extend the range of a connection?
A.Coaxial
B.Loaded
C.Fiber-optic
D.Copper

Question 22

What is the busiest day of the week for telephone traffic?
A.Sunday
B.Monday
C.Saturday
D.Friday

Question 23

The measure of calls lost during a busy hour period is known as _____________.
A.grade of service
B.congestion
C.holding time
D.traffic measurement

Question 24

What causes transmitted data to be routed back to the originating location by the receiver or,in telephone and wireline data systems?
A.Signaling systems
B.Packet switching
C.Virtual path connection
D.Loopback capability

Question 25

The ______ for almost all telephone transmissions is a two-wire twisted-pair cable.
A.local loop
B.cable infrastructure
C.trunk line
D.loopback