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Comprehensive Overview of Transmission Modes, Modulation, and Multiplexing

This summary encapsulates the key points from Chapters 9, 10, and 11 of Dr. Abraham's lectures at UTPA. Chapter 9 delves into transmission modes such as parallel and serial transmission, covering their differences and applications, including UART for converting formats. It also discusses asynchronous and synchronous transmission, byte framing, and duplex methods. Chapter 10 focuses on modulation techniques, including carriers and signal propagation. Chapter 11 explores multiplexing and demultiplexing methods, including FDM, TDM, and CDM. This summary enhances understanding of advanced communication concepts.

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Comprehensive Overview of Transmission Modes, Modulation, and Multiplexing

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  1. Chapters 9,10,11 Dr. Abraham Professor UTPA

  2. Already discussed • These chapters were discussed in previous lectures. • A summary is given here

  3. Chapter 9 Transmission modes • Parallel transmission • Faster. More wires required including controls. • Serial Transmission • Replacing parallel as computers are faster now. Less prone to errors and longer cable lengths. Parallel data has to be converted to serial using UART. • Transmission order, MSB or LSB (UART is little endian generally).

  4. Asynchronous and Synchronous transmission • Asynchronous: RS-232 – see handwritten notes • Synchronous – sender and receiver are always synchronized, does not require start and stop bits.

  5. Bytes, Blocks and Frames • Sending bytes can be slow. What happens if data is not available to send at all times. • Framing: collect a block of data and then transmit together. Idle bytes and frame start bits are added.

  6. Simplex, half duplex and full duplex transmission • Simplex – transfer data only in one direction (broadcast radio). • Half duplex: shared transmission medium so only one way at a time. Like walkie talkies. • Full duplex – two channels for sending and receiving. • DCE and DTE see my handwritten notes.

  7. Modulation and Modems Chp 10 • Carriers, Frequency and Propagation. A frequency that will propagate for needed length is used and then data is added to it. Refer to AM, FM, PSM from my notes. • Also refer to modem related notes.

  8. Chapter 11 Multiplexing and Demultiplexing • FDM – frequency division • WDM (wavelength division) • TDM – Time Division and variations. • Inverse multiplexing • CDM – code division

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