Data Encoding Techniques - WPI
Physical Layer ? Part 2 Data Encoding Techniques
Networks: Data Encoding
1
Analog and Digital Transmissions
Figure 2-23.The use of both analog and digital transmissions for a computer to computer call. Conversion is done by the modems and codecs.
Networks: Data Encoding
2
Data Encoding Techniques
? Digital Data, Analog Signals [modem] ? Digital Data, Digital Signals [wired LAN] ? Analog Data, Digital Signals [codec]
? Frequency Division Multiplexing (FDM)
? Wave Division Multiplexing (WDM) [fiber]
? Time Division Multiplexing (TDM)
? Pulse Code Modulation (PCM) [T1]
? Delta Modulation
Networks: Data Encoding
3
Digital Data, Analog Signals
[Example ? modem]
? Basis for analog signaling is a continuous, constant-frequency signal known as the
carrier frequency.
? Digital data is encoded by modulating one of the three characteristics of the carrier: amplitude, frequency, or phase or some combination of these.
Networks: Data Encoding
4
A binary signal
Amplitude modulation
Frequency modulation
Phase modulation
Figure 2-24.
Networks: Data Encoding
5
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