WorksheetsDCN_Unit2
Total questions: 10
Worksheet time: 10mins
A digital signal with a bit rate of 2 Mbps is transmitted over a medium with a propagation speed of 2 × 10⁸ m/s. What is the bit length?
1 m
10 m
100 m
0.1 m
During a video call, some packets arrive late and out of order. What issue is the user experiencing?
Latency
Jitter
Attenuation
Bandwidth mismatch
How would poor frame synchronization affect a synchronous TDM system?
Bit rate would increase
Output becomes continuous
Bandwidth will be over-utilized
Data from one source may be received by another
Why might a virtual-circuit network experience variable packet delay even if all packets take the same path?
Resources are allocated dynamically
Packets are encoded differently
Transmission uses different channels
Addressing errors
What happens if bandwidth-delay product is large in a network link?
Less data can be in transit
More bits can be in transit
Jitter is zero
Signal-to-noise ratio improves
Which of the following situations would require modulation of a digital signal before transmission?
When the channel is low-pass
When the bit rate is very low
When the medium only supports analog bandpass signals
When using a fiber-optic link
Which transmission impairment would most likely occur if different frequency components of a signal arrive at different times?
Distortion
Attenuation
Noise
Jitter
How would using 8 signal levels in a noiseless channel with 3 kHz bandwidth impact the data rate? (Nyquist's formula)
It would provide a data rate of 18 kbps
It would provide a data rate of 6 kbps
It would create interference
It would decrease bandwidth
If you’re transmitting a 4 MB file over a channel with 1 Mbps bandwidth, ignoring delay and losses, what is the ideal transmission time?
8 seconds
4 seconds
32 seconds
16 seconds
Which multiplexing method would be most appropriate for combining multiple optical signals?
FDM
TDM
CDM
WDM
