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Hello Gentlaman,The subject is quite old. But I just wanted to share my working example.I use this for the cases with limited cable installation for some of the departments.This chart is for the installation in the system room.You will just use the same on the wall sockets and distribute two ends to two user.So briefly,1. one and to the patch pannel and two ends are to the main switch to get the line.2. with the users room's wall socket, one end to the wall socket and two ends to two users.This perfectly works for me without ant signal loss.I hope it helps somebody.
Because one might try to connect a phone device or a phone line into a data jack. An analog phone line rings at 90 Volt AC and it talks at 48 Volt. One can easily see that a user mistakes might blow up an entire cheap switch. since people usually try before they think, this complex wiring scheme has probably saved more than 1 000 000 ethernet switch in 20 years.
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It's a little late now. I found my dad's old ethernet splitter from the 80's and it works fine. But thank you for answering my question anyway, it might be useful someday :) - JonE13
Yes. It works. I have done exactly that 10+ years ago because I couldn't run a 2nd cat5 cable through the tubes (filled with telephone cables already). Make sure you follow the right paring: pairs should end on 1&2 and 3&6 on the wall socket. You will be limited to FastEthernet (100 MBit) though. - treysis
Well, I see what you did, but the original wiring diagram is there for a reason. While the cable is SIMPLY transmitting the signal, it is NOT A SIMPLE cable! Ethernet-cables are twisted-pair-cables. That means, the wires inside the cable are twisted in pairs. This is important to minimize crosstalk between the cables (interference so to say). So the pairs in an Ethernet cable are as follows:1&2, 3&6, 4&5, 7&8The first socket should be using the original wiring of 1&2, 3&6. So the data runs completely through 2 twisted pairs. The other socket should follow the pairing-structure. So from the second port, the 1&2 should go to one twisted pair, and the 3&6 should also go to one twisted pair. As you can see, you have 4&5 and 7&8 left. Therefor you should now connect (from the 2nd socket) 1&2 to 4&5 and 3&6 to 7&8. You could also mix it up totally, e.g. like this:1st socket: 1&2 to 4&5, 3&6 to 3&62nd socket: 1&2 to 7&8, 3&6 to 1&2It is only important that pairs are again transmitted through pairs. Otherwise you might severely compromise the speed/reliability of your connection.I hope my explanations were ok. Otherwise, please ask. - treysis
PS: Why the ethernet standard used such a confusing wiring from the beginning (i.e. not aligning the pairs 1&2, 3&4, 5&6, 7&8) is beyond me... - treysis
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