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Ethernet: The Basics

126 点作者 electroagenda大约 1 年前

9 条评论

userbinator大约 1 年前
It&#x27;s worth noting that the IEEE 802.3 standards are legally freely available, if you want to go for the definitive reference: <a href="http:&#x2F;&#x2F;ieeexplore.ieee.org&#x2F;browse&#x2F;standards&#x2F;get-program&#x2F;page&#x2F;series?id=68" rel="nofollow">http:&#x2F;&#x2F;ieeexplore.ieee.org&#x2F;browse&#x2F;standards&#x2F;get-program&#x2F;page...</a><p>Once you get over the copious standardese, and the fact that the standards describe some things that seem like a good idea yet have never been implemented (e.g. 100BASE-T2), they are a good source of very detailed and authoritative information.
willis936大约 1 年前
Is that 100 Mbps Ethernet vs telephone pin assignment correct? I thought that the inner pairs that are treated like RJ11 would be the telephone lines and the outer pairs would be Ethernet.<p>Edit: apparently it is right. I hate how intuition based on principles of simplicity and signal integrity are betrayed at every level of classic Ethernet.<p><a href="https:&#x2F;&#x2F;en.wikipedia.org&#x2F;wiki&#x2F;Modular_connector#8P8C" rel="nofollow">https:&#x2F;&#x2F;en.wikipedia.org&#x2F;wiki&#x2F;Modular_connector#8P8C</a>
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atoav大约 1 年前
Tangentially related question: Does anybody have a good <i>overview</i> resource how to configure networking in a linux system (exluding graphical tools)?<p>I know there are multiple ways to do similar things and settings are somewhat scattered into different files, but this is why I wondered if there is some kind of <i>overview</i> that I could use as a starting point.
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shmerl大约 1 年前
SFP+ got much cheaper now, so you can get 10 Gbps way easier than in the past.<p>The issue seems to be switching. To switch so much data you need either a powerful CPU or some kind of ASIC and apparently all those ASICs are proprietary and no one wants to make 10 Gbps switches with open firmware becasue of that.
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theogravity大约 1 年前
Wish it talked about the cursed adapter. Would you have two of these adapters on each end, and the single cable would be split into two separate pairs for 100 Mbps ea?
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the_arun大约 1 年前
I wish I had seen this earlier. In the days of WiFi, do we use Ethernet?<p>The site is well designed with neatly organized comments.
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mbreese大约 1 年前
Is it just me, or are the pin numberings (not the order) wrong on their 568A&#x2F;B pinouts? I’m having a hard time getting past that…
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AlbertCory大约 1 年前
&gt; It used to be that you could use a coaxial cables for Ethernet and wire a single cable between computers, but those days are long gone, and the speeds were low enough that the major reason to miss those times is nostalgia.<p>ah yes. I tried to make drama out of Xerox&#x27;s whole Ethernet going down, because of a storm just like we&#x27;re having now (except no lightning).<p>========= &quot;Lightning Strikes&quot; chapter of <i>Inventing the Future</i> =====<p>Thursday, January 5, 1978. Janet was visiting Palo Alto again, something she never tired of. Today, she was just supposed to check in with people and learn whatever she could about the Pilot operating system, the product hardware, Ethernet, user interface, and all that.<p>In one of those magic changes of name that Xerox never officially announced because that would let an enemy keep track of code names, the product was now called “Star,” She hoped she wouldn’t slip up today and call it “Janus.”<p>This time she took an earlier flight than she had been lately, the 7:00 am PSA flight out of LAX. She hated having to get up at an obscene hour, but really, if you took a more reasonable flight, you got to the office at 10:45 or later, and that made it a pretty short day. This morning, the roads were all wet and littered with tree branches and leaves. Apparently, it had stormed the night before.<p>She first went to Grant’s office to talk about the latest marching orders from corporate management. Grant was pacing back and forth, frowning, holding the base of the phone in his right hand and the receiver in his left. He glanced at Janet, smiled briefly, and motioned to the guest chair.<p>“How much of the network is down?” The answer seemed to make him even more worried. “Does Michael know? Okay, I’ll tell him.”<p>“Who’s looking into this?” He wrote down some names on a yellow pad.<p>“Um, yeah. We have Peter McColough and Bill Glavin flying out tonight for a demo.” He stared at Janet, knowing he just dropped the name of the Chairman of the Board. Janet knew McColough was adamant that no exec would ever touch a keyboard—that was for their secretaries. The idea of an expensive computer like Star for knowledge workers, whatever that meant, was dubious to him. His rule of thumb was that you shouldn’t buy a piece of equipment for a secretary that cost more than her annual salary. The execs were already a hostile audience. A bad demo was about the last thing Grant needed.<p>“I’ll let you get back to it. Keep me posted.” He hung up and turned to Janet, “The entire Ethernet is down. Excuse me, but I need to work this out.” He started for the door, then paused. “On the other hand, do you want to help out?” Grant strode briskly toward Michael’s office with Janet trying to keep up.<p>=====================
KryptoKnight大约 1 年前
Nothing new but thanks for the refresher