Ethernet Network

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Networking
What type of modulation does the Ethernet network use (cat 5 cable)?

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I’m not sure that it’s correct to say Ethernet uses modulation at all. Modulation is used to describe transmitting data as waves such as those used by radio or (closer to what you’re asking) modems.

Ethernet transmits bits one at a time using something called “Manchester encoding.” Manchester encoding works by looking at the transition of the signal from 1 to 0 representing 0 and 0 to 1 representing 1. The “preamble” is used to fix the clocks on the source and destination host prior to the transmission of actual data.

Given the scheme uses transitions as a means to encode the bits I suppose you could argue it uses phase modulation but I’d argue you’re wrong. :-)

HTH

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  • Bigshybear
    10BaseT uses Manchester encoding http://www.cisco.com/univercd/cc/td/doc/cisintwk/ito_doc/ethernet.htm#wp1020850 100BaseTX uses 4B5B (Encoding descriptions: http://www.rhyshaden.com/encoding.htm)
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  • ComputerSolutions77
    Because you put '(cat 5 cable?)' in your quesiton I am replying on cables. Use CAT5 for 10/100 mbps and cat6 for 1000 mbps and be sure to get plenium or PVC depending on what your zoning and air exchange requires.
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  • patrickScott12
    I agree with amigus.
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  • patrickScott12
    you can only use the word modulation when you are talking about the RF kinks such as terrestrial microwaves for instances 16 QA M, QPSK and so on. But in the context of Ethernet Network, in standard and modernity we use Cat5 cable as a transmission medium.
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  • BlankReg
    The encoding and modulation are not the same thing. Modulation is the changes made on the physical media to be detected at the following end, encoding is how you use those changes to represent the data. Ethernet on twisted pair (including cat5) uses Pulse amplitude modulation. Have a look at this white paper on the Cisco site. http://www.cisco.com/global/EMEA/sitewide_assets/pdfs/realbroadband/gigabit_ethernet_over_copper_white_paper.pdf
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