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802.3 Auto Negotiation Introduction.ppt

发布时间：2022-06-17 发布人：admin 分类：说明书 资料大小：0.51M 资料格式：ppt 举报 版权申诉
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    This is good stuff folks. By Matthew Hersh © UNIVERSITY of NEW HAMPSHIRE INTEROPERABILITY LABORATORY
    • To portray the concept of Auto-Negotiation (ANEG) • To exhibit how devices choose the appropriate link speed and duplex. • To compare copper and fiber Auto-Negotiation methods. UNIVERSITY of NEW HAMPSHIRE INTEROPERABILITY LABORATORY Auto-Negotiation (It’s the way to go)
    • What is ANEG? Some devices support more than one speed, i.e. 10BASE-T and 100BASE-TX. A device that supports multiple speeds and/or duplex’s needs a mechanism to decide what speed and duplex to link at. ANEG is that mechanism. UNIVERSITY of NEW HAMPSHIRE INTEROPERABILITY LABORATORY Auto-Negotiation (It’s the way to go)
    • Lets look at an example. – Two men are stranded on two different islands. Each one is very lonely and wants to talk to someone. – So one day the first man “James” carves a note into a piece of bark and throws it into the ocean. – To his great surprise and excitement many days later a piece of bark floats onto his beach, but when he picks it up, the note he finds is in a different language. UNIVERSITY of NEW HAMPSHIRE INTEROPERABILITY LABORATORY Auto-Negotiation (It’s the way to go)
    – James isn’t about to give up, so he sits down and tries to figure out a way to communicate, first he decides they need to speak the same language, but he doesn’t know what language(s) his friend speaks. – While he is thinking a second piece of bark floats onto the beach. He looks at it and finds that is identical to the first one, so he still can’t read it, but he realizes that the man he is talking to is very smart. – By throwing more than one piece of bark with the same note, it increased that chance that he would receive it UNIVERSITY of NEW HAMPSHIRE INTEROPERABILITY LABORATORY Auto-Negotiation (It’s the way to go)
    – So now James starts to carve a new note. He writes down each of the languages he can speak, and if he speaks it fluently or not. Then he copies it many times and throws them into the ocean. – Days later, he starts to get pieces of bark back. His friend had gotten the idea, and all of these pieces of bark listed the languages his friend could speak. – So he circled a language they could both speak fluently and threw them back into the ocean. UNIVERSITY of NEW HAMPSHIRE INTEROPERABILITY LABORATORY Auto-Negotiation (It’s the way to go)
    – The next piece of bark he received was a hello note from his new friend “Chris” in a language that he could read, and from then on they were great pen pals. UNIVERSITY of NEW HAMPSHIRE INTEROPERABILITY LABORATORY Auto-Negotiation (It’s the way to go)
    • A device will always be sending stuff, even when not connected to another device. – If the device only supports one speed/duplex combo, then the device will be transmitting link signaling according with that speed (Does not support ANEG – Legacy device). – If the device supports more than one speed (or duplex), then the device will be transmitting FLPs (Does Support ANEG). UNIVERSITY of NEW HAMPSHIRE INTEROPERABILITY LABORATORY Auto-Negotiation (It’s the way to go)
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