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allamiro

Why is there a minimum frame size for an 802.3 LAN?

  • one year ago
  • one year ago

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  1. Chris2332
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    http://www.javvin.com/protocolEthernet.html

    • one year ago
  2. allamiro
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    I found that link too when I was searching however I was confused after eading the IEEE standards pdf A minimum frame size is required for correct CSMA/CD protocol operation and is specified by the particular implementation of the standard

    • one year ago
  3. Chris2332
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    The original Ethernet IEEE 802.3 standard defined the minimum Ethernet frame size as 64 bytes and the maximum as 1518 bytes. The maximum was later increased to 1522 bytes to allow for VLAN tagging. The minimum size of an Ethernet frame that carries an ICMP packet is 74 bytes. You can test this by installing a packet analyzer on your desktop and by running a ping packet with no options to a destination inside your network. It will generate a 74 byte packet with a 60 byte IP Header, 8 byte ICMP header, and Ethernet frame size. The maximum size supported is where you can adjust the data options in the ICMP payload to add additional length to the packet. This would be limited by the MTU which in an Ethernet LAN would be 1500 bytes by default. Do you need to know why this was done or are you happy with the above?

    • one year ago
  4. allamiro
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    Based on the article The main disadvantages of the half-duplex are the efficiency and distance limitation, in which the link distance is limited by the minimum MAC frame size. This restriction reduces the efficiency drastically for high-rate transmission.

    • one year ago
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