Data Communication and Networking Worksheet (Extraction)

In which encoding scheme does the signal return to zero halfway through each bit interval?

• NRZ-L

• NRZ-I

• RZ

• Manchester

According to the Nyquist theorem, the sampling rate must be at least:

• Equal to the highest frequency

• Twice the highest frequency

• Half the highest frequency

• Same as the bandwidth

Which modulation method is most susceptible to noise?

• ASK

• FSK

• PSK

• QAM

In bipolar AMI encoding, binary 1s are represented by:

• Positive voltage only

• Negative voltage only

• Alternating positive and negative voltages

• Zero voltage

If the bit rate is 2400 bps and each signal element carries 3 bits, the baud rate is:

• 2400 baud

• 1200 baud

• 800 baud

• 400 baud

Unipolar encoding uses both positive and negative voltage levels.

• True

• False

In differential Manchester encoding, a transition at the beginning of the bit interval indicates binary 0.

• True

• False

In FM, the bandwidth required is twice the bandwidth of the modulating signal.

• True

• False

In ______ encoding, the inversion at the middle of the bit is used for synchronization, and the presence or absence of an additional transition at the beginning identifies the bit.

• Manchester

• NRZ-I

• Differential Manchester

• Bipolar AMI

The Nyquist theorem states that the sampling rate must be at least ______ the highest frequency of the signal.

• equal to

• twice

• half of

• the same as the bandwidth of