WorksheetsDCN5511: Chapter 5 - 7
Total questions: 15
Worksheet time: 7mins
In TDM, multiple signals
share a common bandwidth
modulate subcarriers
are sampled high speeds
take turns transmitting
In FDM, each signal may use the full bandwidth of the channel
True
False
Converting analog signals to digital is done by sampling and __________.
quantizing
compounding
multiplexing
mixing
Identify type of multiplexing.
FDM
WDM
AM
TDM
What is the purpose of cladding in an optical fiber?
Covert the electric current pulse to light pulse.
To keep the light reflecting in core instead of being refracted until its destination.
Preserve fiber strength, absorb shock and provide extra fiber protection.
Convert the received light pulses back to pulses of electrical current.
A parabolic dish antenna is a(n) ___________ antenna.
unidirectional
bidirectional
omnidirectional
transdirectional
Transmission media are usually broadly categorized as ___________.
shielded and unshielded
fixed or unfixed
guided or unguided
metallic or nonmetallic
Twisting in a twisted-pair help reduce the __________.
length
cost
noise
interference
In fiber optics, the signal source is __________waves.
light
electrical
radio
infrared
A ____________________ error means that two or more bits in the data unit have change.
bit
double bit
burst
complex
What should the value of ? be if the byte ?0110110 is transmitted using even parity
0
1
In Go-Back-N ARQ, if an error is detected what should the receiver do?
Receiver corrects the error
ask to retransmit the data
Ignore the error
Do nothing
In the _________ method, after the station finds the line idle, it sends its frame immediately. If the line is not idle, it continuously senses the line until it finds it idle.
p-persistent
nonpersistent
1-persistent
none of the above
__________ tells the sender how much data to send.
Error Control
Flow control
Medium Access
Multiple Access
In CSMA/CD after the occurrence of collision, station waits for some random __________ and then retransmits.
I'll be back
backoff time
backout time
backin time
