DIGITAL DATA DIGITAL SIGNAL ENCODING, Exams of Data Communication Systems and Computer Networks

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DIGITAL DATA DIGITAL

SIGNAL ENCODING

 (^) In this session, we see how we can represent digital data by using digital signals. The conversion involves three techniques: line coding, block coding, and scrambling. Line coding is always needed; block coding and scrambling may or may not be needed.

SIGNAL ELEMENT VERSUS DATA ELEMENT

EFFECT OF LACK OF SYNCHRONIZATION

UNIPOLAR NRZ SCHEME

CHARACTERISTICS OF UNIPOLAR

SIGNAL

 (^) It uses only one polarity of voltage level  (^) Bit rate is same as the data rate  (^) DC component is present  (^) Loss of synchronization for long sequences of 1’s and 0’s  (^) Simple but obsolete

POLAR RZ SCHEME

POLAR BIPHASE: MANCHESTER AND

DIFFERENTIAL MANCHESTER SCHEMES

BLOCK CODING CONCEPT

USING BLOCK CODING 4B/5B WITH

NRZI LINE CODING SCHEME

4B/5B MAPPING CODES

TWO CASES OF B8ZS SCRAMBLING

TECHNIQUE