What is the technical difference among:Ethertnet,Fastet and GigEthernet?

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Feb 7th, 2009
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Folks, I understand that Ethernet (10Mbps) FastEthernet (100Mbps) and GigEthernet (1Gbps) have same frame (IEEE 802.3) and operate with CSMA/CD.

Then on the GigEthernet, I understand that the CMSA/CD scheme was enhanced with carrier extension and frame bursting.

Is the information above correct or I am missing something to explain how the Fast and Gigbitethernet can deliver higher speeds?

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viyuan700 Sat, 02/07/2009 - 17:45
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In my opinion you get higher speed becuase of better technology available to make Transmitter/Receiver operating at those higher speed, modulation techniques etc.

CSMA/CD is basically reducing your speed when same media is shared by several users whereas most of the network is switched where CSMA/CD is not used.

Enhanced carrier extension and frame bursting for Gig etherent is method to use CSMA/CD for higher speed.

glen.grant Sat, 02/07/2009 - 17:54
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Gigabit speeds are achieved by running data across all 8 wires as opposed to just using wires 1,2,3 and 6 . You must have 4 good pairs of wires within the data path otherwise it wilkl only negotiate 100 meg or lower. For a real technical answer just google it .


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