Midterm Exam #1 Review• Exam time is Jun. 12 during class time.• The first homework will be fully covered.• Necessary formulas will be provided in the exam

sheet (but without explanation of notations).• You need to compute out the final numerical

results in your answer. Do not simply write down the formula as your answer.– You can bring a calculator (no computer, iPhone, etc)– The numbers in exam are easy to compute without

computing of log10() or log2() using calculator

Question Types– Knowledge questions

– True or false statement (explain why)

– Calculations

Knowledge Question Examples

• What is the relationship between OSI 7 layer model and the TCP/IP 5 layer model?

• What are the three types of transmission impairment? SNR relates to which one of them? dB/m unit relates to which one of them?

• Can you say if a signal is periodic or nonperiodic by looking at the frequency domain plot? How?

• What does SNR represent? Its formula?• What is the full name of MODEM? Does Cable Modem or

DSL use baseband communication? Does Ethernet use baseband communication?

• Why Cable and DSL provide higher downstream bandwidth than upstream bandwidth?

Knowledge Question Examples

• Why optical fiber introduces much less noise to data than Ethernet lines? Why optical fiber cannot bend arbitrarily while Ethernet line can?

• What are the three mode of radio propagation? What mode of propagation is used by FM radio? Cellular tower? Long-wave AM radio?

• In telephone network, does signaling use the same channel as data transmission?

• What are the three types of topology in wired LAN? What topology does current Ethernet use?

Calculation Problem Examples

• All computation questions in Homework 1 • dB of SNR computing (Example 3.31) • bitRate requirement computing (Example 3.18)• Period and frequency computation (Example 3.5)• Attenuation computing (Example 3.26)• dBm and dB/km computation (Example 3.29/30)

• SNRdB (Example 3.31)

• Nyquist theorem usage (Example 3.36)• Shannon theorem usage (Example 3.39)• Throughput and delay (Example 3.47)

Homework 1 Statistics

• Count: 16• Average: 69.8• Median: 73.5• Maximum: 91.0• Minimum: 30.0

MidTerm 1 Statistics