Chapter 4 making connections
Download
1 / 16

Chapter 4 Making Connections - PowerPoint PPT Presentation


  • 56 Views
  • Uploaded on

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

loader
I am the owner, or an agent authorized to act on behalf of the owner, of the copyrighted work described.
capcha
Download Presentation

PowerPoint Slideshow about ' Chapter 4 Making Connections' - todd


An Image/Link below is provided (as is) to download presentation

Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author.While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server.


- - - - - - - - - - - - - - - - - - - - - - - - - - E N D - - - - - - - - - - - - - - - - - - - - - - - - - -
Presentation Transcript
Chapter 4 making connections

Chapter 4Making Connections


Modem
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)


Types of modems
Types of Modems

  • Internal

  • External


Types of modems1
Types of Modems

  • Modems for Laptops

  • PCMCIA cards

  • PC Cards

  • Cardbus (32bit PC card)



Modem pools
Modem Pools

  • Multiple workstations sharing a modem.

  • External users to dial into a business or corporate network


Traditional interface standards
Traditional Interface Standards

  • Specified the interface between a DTE and DCE

    • EIA-232F

    • RS-232m

    • RS-449

    • X.21

    • Bell Interface Standards

    • Hayes


High speed interface protocols
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


High speed interface protocols1
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


Asynchronous connections
Asynchronous Connections

  • Data link layer.

  • Unit: frame

    • Start bit

    • Stop bit

    • Parity bit to detect errors


Synchronous connections
Synchronous Connections

  • Data link layer

  • A large package (frame)

    • header and trailer flags

    • control information

    • optional address information

    • error detection code (checksum)

    • data.


Terminal to mainframe computer connections
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.



Connections in action1
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


ad