CS 3413 Data Communications Second Midterm Exam Review: Fall 2004

The exam will cover chapters 5-7 of the text and some material from class that is not in the text. The book material will start with section 5.2. The main material that is not from the book is the Data Link Layer Protocol code from the notes.

It may be necessary to understand the material from the first midterm exam to do some of the problems on the second midterm exam. You should be able to use the Nyquist and Shannon formulas.

You should understand the following concepts:

• Amplitude shift keying (ASK), frequency shift keying (FSK), phase shift keying (PSK).
• Pulse Amplitude Modulation (PAM), Pulse Code Modulation (PCM), Delta Modulation
  Know the difference between PAM and PCM.
  The Sampling Theorem.
• Amplitude modulation, frequency modulation, phase modulation.
  Note that ASK, FSK and PSK are for analog signals representing digital data, while these are for analog signals representing analog data.
• Asynchronous transmission, start and stop bits, clock skew
• Synchronous transmission
• Error detection and correction, Hamming distance
• CRC code generation
• Data Link Layer protocols.
  Stop-and-wait
  Sequential receive (Go-back-N)
  Nonsequential receive (Selective reject)
  Make sure you understand the protocol code from the notes.
  Look at the review questions.