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I have moved to a new house and wanted to setup in-house networking. In 4 rooms, there are sockets with 2 Ethernet ports mounted into the walls. In the entire house, it makes a total of 8 Ethernet ports, but in the network box, I see only 4 cables. I have figured out that every single cable in the box ends in each socket with two ports. I have never seen such thing ever, can somebody explain it to me how it works?

My idea is to put a router in the network box and connect it with all the 4 cables. What is very intriguing for me is that one cable ends with two ports. How will that work? If I connect 2 devices on the same cable, will that work properly? Will the router properly recognize both devices? Do I need any specialized router? Does this technology have any name?

I am attaching a picture of the network box and pictures of the socket. You can see that there goes only one cable to the socket, but socket has two ports.

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I will be thankful for every answer. The more it is detailed, the better. I am working myself in IT (software engineering), so it is a shame to not know what is going on with my own network in my own house.

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2 Answers 2

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What do you mean, “how it works”? Only one of the two ports is connected. It’s super simple.

Why would anyone do this? Because from my experience, two-port jacks are much easier to acquire.

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  • Ohh I didn't figure out there is only one port connected, I thought this cable hooks both ports. I must be blind. Thank you very much for your answer and for the explanation why would somebody do this!
    – Adam
    Aug 28, 2017 at 16:25
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What is very intriguing for me is that one cable ends with two ports. How will that work?

The socket might have 2 ports but only the one connected to the orange cable will be functional and connected to your network.

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If I connect 2 devices on the same cable, will that work properly? Will the router properly recognize both devices?

Only the device connected to the orange cable will be connected to your network.

Does this technology have any name?

It is called IEEE 802.3

In the entire house, it makes a total of 8 Ethernet ports, but in the network box, I see only 4 cables.

If you only see 4 cables in the network box, it means in your entire house, you actually only have 4 Ethernet ports.

Do I need any specialized router?

Any router which can support 4 Ethernet devices will work.

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  • I didn't notice that there goes one cable per port! Thank you for your answer!
    – Adam
    Aug 28, 2017 at 16:26

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