modern possibilities of access and transport networks
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Modern Possibilities of Access and Transport Networks. Vladislav Skorpil. The principle of Time Division Multiplex. The Principle of Pulse Code Modulation (PCM). The Principle of Delta Modulation (DM) and Adaptivre delta Modulation (ADM). Adaptive Diferential PCM - ADPCM. - PowerPoint PPT PresentationTRANSCRIPT
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Modern Possibilities of Access and Transport Networks
Vladislav Skorpil
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The principle of Time Division Multiplex
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The Principle of Pulse Code Modulation (PCM)
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The Principle of Delta Modulation (DM) and Adaptivre delta
Modulation (ADM)
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Adaptive Diferential PCM - ADPCM
• For signal with no constant midle power, samples are adapted to constant midle power
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The basic block diagram for TDM system with digital modulation
• Older type
• Common codec
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Transmiter part
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Receiver part
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The basic block diagram for TDM system with digital modulation
• Modern type
• Individual codec
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Quantizing step encoder
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Weighting encoder (Bit encoder)
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Counting Analogue to Digital Convertor
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Tracking A/D Convertor
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Parallel A/D Convertor
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Compenzating A/D Convertor
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Shannon decoder
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Shannon decoder response
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Shannon Rack decoder
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Shannon-Rack Decoder Response
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Weighting Decoder (Bit Encoder)
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Operational Amplifier
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D/A Convertor with weighting resistors
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D/A Convertor with cross piece structure of resistor networks
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D/A Convertor with current sources
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Compandors and non-linear encoders
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Compression and expansion characteristics
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A-low compression characteristic
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Unipolar and Bipolar Signal, Signal NRZ, RZ, TPC, SPC, HDB3,AMI
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Code HDB3
• Maximal 3 zeroes in sequence• When the sequence of 4 or more zeroes
exist, then forth one is encoded as the impulse with the same polarity as the previous one
• This bipolarity interruption must be positive after negative and negative after possitive (zero direct current part)
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Isolation impulse
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Identification of impulse
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Decision eye – bipolar signal
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Decision eye – unipolar signal, basic noise
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Influence of impulse interference
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Influence of jitter
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Generation of AMI signal
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Quantizing distortion
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Peak limiting
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Time behaviour of sampling
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Spectrum of sampling signal – PAM 1st sort
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Ideal PAM 1st order (wide of samples approaches to zero
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Spestrum of sampling signal -2nd order
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Spectrum of PAM 2nd order – wide of samples equals to sampling
periode
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• This is the end of my slides to the theme Modern possibilities of access and transport networks
• If you have any questions, you can write e-mail to: