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Network Operations & administration CS 4592 Lecture 8

Network Operations & administration CS 4592 Lecture 8. Instructor: Ibrahim Tariq. Quiz. Quiz. Q3Five 6 Kbps connections are multiplexed together. A unit is 1 bit Find a) The duration of 1 bit at input b) the duration of 1 bit output c) output bitrate d) output frame duration

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Network Operations & administration CS 4592 Lecture 8

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  1. Network Operations & administration CS 4592Lecture 8 Instructor: Ibrahim Tariq

  2. Quiz

  3. Quiz • Q3Five 6 Kbps connections are multiplexed together. A unit is 1 bit Find • a) The duration of 1 bit at input b) the duration of 1 bit output c) output bitrate d) output frame duration • e) Output frame rate [8marks]

  4. Quiz • Q4) Define 3 kinds of Transmission Impairments with example? [3 marks] • Q 5) A channel bandwidth with 1 KHZ and Signal to Noise Ratio 3 db. Calculate Bit rate and Signal Levels required using Shannon capacity formula and Nyquist bit rate and?[4marks]

  5. Figure 4.4 Line coding schemes

  6. Figure 4.5 Unipolar NRZ scheme

  7. Figure 4.6 Polar NRZ-L and NRZ-I schemes

  8. Note In NRZ-L the level of the voltage determines the value of the bit. In NRZ-I the inversion or the lack of inversion determines the value of the bit.

  9. Note NRZ-L and NRZ-I both have a DC component problem.

  10. Figure 4.7 Polar RZ scheme

  11. Figure 4.8 Polar biphase: Manchester and differential Manchester schemes

  12. Note In Manchester and differential Manchester encoding, the transition at the middle of the bit is used for synchronization.

  13. Note The minimum bandwidth of Manchester and differential Manchester is 2 times that of NRZ.

  14. Note In bipolar encoding, we use three levels: positive, zero, and negative.

  15. Figure 4.9 Bipolar schemes: AMI and pseudoternary

  16. Note In mBnL schemes, a pattern of m data elements is encoded as a pattern of n signal elements in which 2m ≤ Ln.

  17. Table 4.1 Summary of line coding schemes

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