Ethernet
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Ethernet

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This presentation briefly focuses on fast ethernet, gigabit ethernet and switched ethernet.

This presentation briefly focuses on fast ethernet, gigabit ethernet and switched ethernet.

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Ethernet Ethernet Presentation Transcript

  • ETHERNET
    -BY 09BIT059
    (MIHIKA SHAH)
  • ETHERNET
    • Firstly created by Robert Metcalfe
    • Known as DIX ethernet
    • IEEE standardized 802.3
    • Uses manchester encoding
    • Ethernet framing
    • CSMA/CD algorithm
  • FAST ETHERNET (802.3u)
    • Fast Ethernet was designed to compete with LAN protocols such as FDDI (Fiber Distributed Data Interface) or Fiber Channel.
    • IEEE created Fast Ethernet under the name 802.3u.
    • Fast Ethernet is backward-compatible with Standard Ethernet, but it can transmit data 10 times faster at a rate of 100 Mbps.
  • Fast Ethernet Topology
  • Fast Ethernet Implementation
    • Bit rate is reduced to 10 ns from 100 ns.
  • GIGABIT ETHERNET (802.3z)
    • The need for higher data rate resulted in the design of the Gigabit Ethernet (1000 Mbps).
    • The IEEE committee calls the standard 802.3z.
    • All configurations of gigabit Ethernet are point to point.
    • Point-to-point, between two computers or one computer – to –switch.
    • It supports two different modes of operation: full duplex mode and half duplex mode.
    • full duplex is used when computers are connected by a switch.
    • No collision, CSMA/CD isnot used.
    • Half duplex is used when computers are connected by a hub.
    • Collision in hub is possible and so CSMA/CD is required.
    • The 802.3z committee considered a radius of 25 meters to be unacceptable and added two new feature to increase the radius.
    • Carrier Extension tells the hardware to add its own padding bits after the normal frame to extend the frame to 512 bytes.
    • Frame Bursting allows a sender to transmit a concatenated sequence of multiple frames in a single transmission.
    • If the total burst is less than 512 bytes, the hardware pads it again.
  • SWITCHED ETHERNET
    • The heart of the system is a switch containing a high speed back-plane and room for typically 4 to 32 plug-in cards, each containing one to eight connectors.
    • When a station wants to transmit a frame,it outputs a frame to switch.The plug-in card checks to see if the frame is for the other station on the same card.
    • If so, it is copied there otherwise it is sent over high speed back-plane to destination station’s card.
    • What happens if two machines attached to the same plug-in card transmit frames at the same time?
    • It depends in how the card is constructed. All ports on the same card are wired together to form a local on-card LAN.
    • Collisions on this on-card LAN are detected and handled using CSMA/CD protocol.
    • One transmission per card is possible at any instant.
    • All the cards can transmit in parallel. With this design each card forms its own collision domain.
    • In other design, each input port is buffered, so incoming frames are stored in the card’s on board RAM.
    • It allows all input ports to receive(and transmit) frame at same time.
  • THANK YOU