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[image:2.720.23.685.83.383.2]
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[image:3.720.53.627.109.487.2]
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[image:4.720.58.620.90.464.2]
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[image:5.720.45.676.80.385.2]
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Unipolar encoding uses only one voltage level.

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[image:7.720.38.693.228.385.2]
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Polar encoding uses two voltage levels

Polar encoding uses two voltage levels

(positive and negative).

(positive and negative).

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[image:9.720.39.676.84.354.2]
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In NRZ-L the level of the signal is

In NRZ-L the level of the signal is

dependent upon the state of the bit.

dependent upon the state of the bit.

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In NRZ-I the signal is inverted if a 1 is

In NRZ-I the signal is inverted if a 1 is

encountered.

encountered.

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[image:12.720.48.653.101.476.2]
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[image:13.720.91.600.178.424.2]
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A good encoded digital signal must

A good encoded digital signal must

contain a provision for

contain a provision for

synchronization.

synchronization.

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[image:15.720.66.647.189.406.2]
(16)

In Manchester encoding, the

In Manchester encoding, the

transition at the middle of the bit is

transition at the middle of the bit is

used for both synchronization and bit

used for both synchronization and bit

representation.

representation.

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[image:17.720.72.655.177.418.2]
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In differential Manchester encoding,

In differential Manchester encoding,

the transition at the middle of the bit is

the transition at the middle of the bit is

used only for synchronization.

used only for synchronization.

The bit representation is defined by the

The bit representation is defined by the

inversion or noninversion at the

inversion or noninversion at the

beginning of the bit.

beginning of the bit.

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[image:19.720.65.624.155.410.2]
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[image:20.720.74.667.112.415.2]
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Gambar

Figure 4.1    Line coding
Figure 4.2    Signal level versus data level
Figure 4.3    DC component
Figure 4.5    Line coding schemes
+7

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