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Your modem uses the ITU V.32 modem protocol. This modem modulates the signal by using 1 of 16 different combinations of phase and amplitude. What modulation scheme is being used?

  1. FSK
  2. QAM
  3. KBPS
  4. DPSK

Answer(s): B



In a digital data communication network, the CSU/DSU receives the signal from the
DTE and converts it into what type of signal format?

  1. FSK
  2. QAM
  3. Line code
  4. Equalized

Answer(s): C



What type of line coding is used by most digital communications systems?

  1. FSK
  2. QAM
  3. Bipolar
  4. Unipolar

Answer(s): C



To maintain synchronization between a sender and a receiver, digital data transmission relies on:

  1. Specialized clocks on the receiving end.
  2. Continuous voltage within the bit stream.
  3. A completely digital transmission channel.
  4. Frequent changes of voltage within the bit stream.

Answer(s): D






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