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Chapter 4 Making Connections

Chapter 4 Making Connections. Modem. Modulates digital data onto analog signal and then demodulate analog signal back to digital data Features: Standard telephone operations (auto-dial, etc.) Connection negotiation (fallback and forward) Compression and error correction Fax Security

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Chapter 4 Making Connections

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  1. Chapter 4Making Connections

  2. Modem • Modulates digital data onto analog signal and then demodulate analog signal back to digital data • Features: • Standard telephone operations (auto-dial, etc.) • Connection negotiation (fallback and forward) • Compression and error correction • Fax • Security • Self-testing (loop-back – local, remote)

  3. Types of Modems • Internal • External

  4. Types of Modems • Modems for Laptops • PCMCIA cards • PC Cards • Cardbus (32bit PC card)

  5. Types of Modems

  6. Modem Pools • Multiple workstations sharing a modem. • External users to dial into a business or corporate network

  7. Traditional Interface Standards • Specified the interface between a DTE and DCE • EIA-232F • RS-232m • RS-449 • X.21 • Bell Interface Standards • Hayes

  8. High-speed Interface Protocols • FireWire • A bus that connects peripheral devices such as wireless modems and high-speed digital video cameras to microcomputers, at 400 Mbps. • Designated as IEEE 1394. • asynchronous connections • isochronous connections (provides a guaranteed data transport at a pre-determined rate

  9. High-speed Interface Protocols • Universal Serial Bus (USB) • Modern standard for interconnecting modems and other peripheral devices to microcomputers. • Plug and play • Power provided by the USB cable • High-speed connection (USB 1.0 is only 12Mbps, but USB 2.0 is 480 Mbps

  10. Asynchronous Connections • Data link layer. • Unit: frame • Start bit • Stop bit • Parity bit to detect errors

  11. Synchronous Connections • Data link layer • A large package (frame) • header and trailer flags • control information • optional address information • error detection code (checksum) • data.

  12. Terminal-to-Mainframe Computer Connections • A point-to-point connection is a direct, unshared connection between a terminal and a mainframe computer. • A multipoint connection is a shared connection between multiple terminals and a mainframe computer. • The mainframe is called the primary, and each terminal is called a secondary.

  13. Connections in Action

  14. Connections in Action • 1 and 2 - DIN connectors for keyboard and mouse • 3 USB connectors • 4 and 6 - DB-9 connectors, Serial-port • 5 Parallel port connector DB-25 (Centronics) (USB someday?) • 7, 8 and 9 - audio connectors

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