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Chapters 9,10,11

Chapters 9,10,11. Dr. Abraham Professor UTPA. Already discussed. These chapters were discussed in previous lectures. A summary is given here. Chapter 9 Transmission modes. Parallel transmission Faster. More wires required including controls. Serial Transmission

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Chapters 9,10,11

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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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