TTMER5: Equalization of digital line section

Control questions

You must give an answer to 5 questions at the beginning of the laboratory exercise. One wrong answer will make the mark given to the measuring with one grade worse. Two or more wrong answers will result a supplementary measuring!

  1. What kind of transmission characteristic has the network, which has a weight function containing a late or hurrying echo?

  2. Draw the block diagram of the T-filter, review its principle!

  3. Review the build-up of the baseband connection model, and the role of its elements

  4. What speed of data transmission connection can be equalized with a T unit delayed T-filter, and in which band can it be applied, as a broadband equalizer?

  5. Draw the weight function of an N=4-es ideal T-filter, which can provide a near constant amplitude characteristic!

  6. What is the amplitude- and phase characteristic of the T-filter, if cn << c0 ?

  7. Make the approximation of an ideal low-pass filter with a linear phase characteristic with help of a T-filter having 600-Hz of cut-off frequency and specifications of 1/2T=1200Hz, N=4. The coefficients to be set must be determined with a Fourier-serial method. The biggest coefficient value must be 1.
    This task can be made at home in advance, and given in with the name of the student written on it.

  8. Make the correspondence between the elements of the data transmission connection and the tools of the measuring place.

  9. What is the criterion of the distortionless transmssion?

  10. Draw the amplitude and group delay characteristics of a telecommunication channel! Draw a characteristic of a line equalizing amplitude and group delay to it, that if the channel and the equalizer are connected into a cascade, then the resultant transmission characteristic could fulfill the criterion of the distortionless transmission in the operation domain of the telecommunication channel.

  11. On what principle can happen the measurement of the group delay in the EP2 measuring tool?

  12. Why should we switch the DT10 interface tester to a synchronous operation mode (FRAMING SYNC) for the record of the eye pattern during the measurement?

  13. Can we forward the clock signal on the data transmission connection model?

  14. Wny should we switch the DT10 interface tester to an asynchronous operation mode (FRAMING ASYNC) for the measurement of the bit error rate?

  15. What is the eye pattern? How can we display an eye pattern? What conclusions can we draw from the eye pattern relating to the quality of the transmission?

isplay an eye pattern? What conclusions can we draw from the eye pattern relating to the quality of the transmission?