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Basic components III (06.523)

Basic components III (06.523). Basic components of communication networks III Lecture 3. Reminder - network layers. Application layer Network layer Data link layer Physical layer. Standards. Role of standards IEEE ANSI ISO Character encoding. Types of standards. Formal Defacto.

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Basic components III (06.523)

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  1. Basic components III (06.523) Basic components of communication networks III Lecture 3

  2. Reminder - network layers • Application layer • Network layer • Data link layer • Physical layer

  3. Standards • Role of standards • IEEE • ANSI • ISO • Character encoding

  4. Types of standards • Formal • Defacto

  5. Forms of communication • Basics of a protocol • UART, ADB, USB • Serial vs. Parallel • Synchronous vs. Asynchronous • Duplex

  6. Synchronous transmission • Packet/Frame at a time (fixed length) • Fixed length block • Checksum or CRC rather than parity

  7. Asynchronous transmission • Character at a time • Start, stop and parity bits

  8. Duplex • Simplex • One way, No control structure needed • Example: Television • Half duplex • RTS/CTS (Clear/Request to Send) or XON/XOFF (Transmission On/Off) • Example: Walkie talkie, Older modem protocols • Full duplex • Send and receive simultaneously • Example: Telephones

  9. UART • Like a miniature FEP • Parallel -> serial at the right rate • Start, stop, and parity bits • Handshaking (which level?)

  10. ADB • Only used by Apple and NeXT, now dead • No conversion or control bits • Standard bit rate • Dynamic device ID, no handshaking

  11. USB • Dynamic device ID, no handshaking • Hubs • Guaranteed transfer rates • Master/slave protocol

  12. Serial • Slow • Example: Modems, Ethernet • Mainly used between computers

  13. Parallel • Fast • Example: Printers, Fiber optics, Internal bus • Rarely used externally due to timing problems (5m limit).

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