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Electrical Communications Systems 0909.331.01 Spring 2005

Electrical Communications Systems 0909.331.01 Spring 2005. Lab 4: Pre-lab Instruction. Shreekanth Mandayam ECE Department Rowan University http://engineering.rowan.edu/~shreek/spring05/ecomms/. Plan. Digital Communications Transceiver PCM m -Law Quantization T1-Line TDM Protocol

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Electrical Communications Systems 0909.331.01 Spring 2005

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  1. Electrical Communications Systems0909.331.01Spring 2005 Lab 4: Pre-lab Instruction Shreekanth Mandayam ECE Department Rowan University http://engineering.rowan.edu/~shreek/spring05/ecomms/

  2. Plan • Digital Communications Transceiver • PCM m-Law Quantization • T1-Line TDM Protocol • Lab Project 4

  3. ECOMMS: Topics

  4. Digital Communications Transceiver Anti- aliasing Filter Error Control Encoder Data Encryption Encoder Channel/ Line Encoder Source Encoder Sampling Quantization Modulator MUX ADC Analog i/p CODEC MODEM Multiple access channel Analog o/p Error Control Decoder Data Encryption Decoder Source Decoder Audio Amp Reconstruction/ DAC Equalization / Decision Circuits Demod-ulator DEMUX

  5. Channel 1 Channel 24 Channel 2 1 1 1 2 2 2 3 3 3 4 4 4 5 5 5 6 6 6 7 7 7 8 8 8 T1-Line TDM Format 1 Frame = (24 Channels + F) = 125 ms F 193 bits Frame Sync Bit Even Frames: 0 0 1 1 1 0 Odd Frames: 1 0 1 0 1 0 Every Sixth Frame LSB (8th bit) is a Signaling bit Bipolar R-Z Line Encoding

  6. Lab Project 4:Digital Baseband Communications http://engineering.rowan.edu/~shreek/spring05/ecomms/lab4.html

  7. Test Circuit

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