Questions tagged [ethernet]

A family of networking technologies for LANs. Ethernet encompasses bother the physical connection between devices and part of the protocols which define how the connected devices can communicate.

Ethernet is based on the idea of points of the network by sending the message boards, in what is essentially similar to a radio system, captive of a common wire or channel, formerly called the ether. This is an oblique reference to the luminiferous ether, the means by which nineteenth-century physicists believed light traveled.

Each point has a key 48-bit globally unique address known as MAC, to ensure that all systems in an Ethernet have distinct addresses.

It has been observed that Ethernet traffic has self-similarity properties, with important consequences for traffic engineering telecommunications. Current standards of the Ethernet protocol are as follows:

  • 10 megabits / sec: 10Base-T Ethernet (IEEE 802.3)
  • 100 megabits / sec Fast Ethernet (IEEE 802.3u)
  • 1 gigabit / sec: Gigabit Ethernet (IEEE 802.3z)
  • 10 gigabits / sec: 10 Gigabit Ethernet (IEEE 802.3ae)
2555 questions
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Why does no small Rj45 port exist?

While I bought my last Tablet I noticed that no Tablet (and most smaller notebooks /convertibles) has a Rj45 port. Which I finde quite dissatisfying since I like to use RJ45 in numerous places. I think a reason could be that Rj45 is simply too big…
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What are the LEDs on RJ45 connector for?

I just noticed (in fact a non-technical colleague of mine told me) that there are 2 LEDs on a RJ45 connector. I always thought there was only 1. Could somebody tell me what they're for? I'm pretty sure that the one on the right that flashes all the…
lang2
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Ethernet cable only works in certain positions

I am stumped. I have a Dlink PoE switch connected at point A. There is an Ethernet socket at point B which is connected to point A through a cable running between walls. I have recently run a 50m CAT6e cable from point B to point C. I had an Archer…
uberqe
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Check MAC address of a device on the other end of an Ethernet cable

Assuming I have a machine with Windows / Mac / Linux OS installed that's connected via Ethernet to an unknown device (e.g.: router, another computer, LAN printer), how can I figure out that device's MAC address?
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What is IEEE 802.3 Ethernet's communication type: Synchronous or Asynchronous?

In the IEEE 802.3 frame structure there is a 7 byte preamble section for synchronization. If it is really for synchronization does that mean Ethernet is synchronous and not asynchronous? Ethernet structure for reference:
Baran
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Ethernet cable connections from coaxial cables

I have two unused coax cables in my the garage. Considering that Ethernet uses only 4 conductors, can I use these two coax cables as my 4 conductors? I could wire the ends to Cat 5 connectors.
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Difference between Ethernet and Ethernet cables?

Though I have read definitions of Ethernet on many websites and everywhere, what I read is that it is a technology. I do not get what do they exactly mean by technology. Is Ethernet the same as an Ethernet cable or are they different?
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Is it Ok to run 2nd Ethernet cable along the wall right on the top of 1st one?

My router has 5 jacks :) so I want to place another (also flat) Ethernet cable along the same wall. Is it any danger of a quality loss if I place this 2nd cable on the top of the 1st one? Or I'd better place 2nd one along the floor line (as 1st one…
Paul G
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Hardware Ethernet On/Off switch

Does anyone know if an hardware ethernet on/off switch exists to buy? Or if it would be possible to build one? I currently have an issue in my software development environment that can only be resolved by pulling the ethernet cable out of my my…
Jon
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RJ45 locking clip breaks when I crimp, how do I crimp without breaking?

I purchased a crimping tool from Ace Hardware, and every time I crimp with it, it presses down on the locking tab so that when I pull the plug out of the crimping tool it doesn't work as a lock anymore. How do I do this without breaking that piece? …
GiH
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Speed of my internet connection

When I plug in my computer to the "World wide web" with an Ethernet cable, does its length affects my internet speed?
E Be
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Why won't a 150 foot cat 5e cable run acquire an IP from my router?

Background: the Uverse guy gave me a big spool of cat5e "in case I needed it later" which was great. Here is the setup: My uverse router is in my house. One cable goes from it down into the crawlspace, into a 10/100 switch which feeds various…
Phil
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Looking for a tool to test my Ethernet connection

I would like to build an instrument to test my Ethernet connection. I would like it to show me if there is a 10/100 or 1000MB Link as well as the IP, subnet, and gateway addresses. Does anyone have any suggestions?
Peter
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Can I split up a telephone line into two ethernet cables?

I have a telephone line and I was wondering. Is there a way to convert the telephone line into ethernet and splitting it so I would be able to have internet on my PS3 and my computer? I already have one ethernet cable and it's plugged into my…
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How do I tell if exposed ethernet cable is plenum grade?

I've found a series of ethernet cables running through various exposed* areas in my house and I'm wondering how to tell if they are plenum grade. *exposed areas are running through duct work and along the base board from the duct vent.
hafichuk
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