Ingeniería informatica Redes Tema 4
1 Polar and bipolar encoding are types of _______ coding.
2 ___________ conversion involves three techniques: line coding, block coding, and scrambling.
3 In ______ schemes, the voltage level oscillates between a positive and a negative value although it may remain at zero level between the two values.
4 In _____, the level of the voltage determines the value of the bit.
5 In ______, the change or lack of change in the level of the voltage determines the value of the bit.
6 The idea of RZ and the idea of NRZ-L are combined into the ________ scheme.
7 The idea of RZ and the idea of NRZ-I are combined into the ________ scheme.
8 In Manchester and differential Manchester encoding, the transition at the middle of the bit is used for __________.
9 In _______encoding, we use three levels: positive, zero, and negative.
10 The _____ scheme uses data patterns of size 2 and encodes the 2-bit patterns as one signal element belonging to a four-level signal.
11 _______ encoding has a transition at the middle of each bit.
12 _______ encoding has a transition at the beginning of each 0 bit.
13 Which of the following encoding methods does not provide for synchronization?
14 Which encoding method uses alternating positive and negative values for 1s?
15 Block coding can help in _______ and _________ at the receiver.
16 ________ is the process of converting digital data to a digital signal.
17 _______ provides redundancy to ensure synchronization and inherent error detection.
18 ________ is normally referred to as mB/nB coding; it replaces each m-bit group with an n-bit group.
19 ________ provides synchronization without increasing the number of bits.
20 Two common scrambling techniques are ________.
21 PCM is an example of _______ conversion.
22 The most common technique to change an analog signal to digital data is called __________.
23 The first step in PCM is ________.
24 ______ finds the value of the signal amplitude for each sample; ____ finds the change from the previous sample.
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