Will a LAN splitter work?

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Hello. I need a LAN splitter, at least I think that is what I require. I live in shared fibre building where phone is line coming from downstairs to my flat. I have a socket where I plug in my cable and I have internet. Now is it possible to connect more devices using something like a splitter. Basically intert this thing into socket which has two other exits, into those exits i can plug in two more devices, does that make sense? Thanks
 
A switch will give you multiple additional ports, a router will also work, but likely cause double NAT which may or may not be an issue for you.
 
This would do:
https://www.overclockers.co.uk/tp-l...rts-plastic-case-tl-sg1005d-v7-nw-174-tp.html

Assuming there's router sharing fiber into your room.
If it's more direct "bridged" connection there could be IP limit from ISP.

What kind IP address command line command ipconfig gives?
Does it start with 10.0 or 192.168?

Router downstairs is BThub and ip does start with 192.168, I also have a full access to the router with admin rights.. I assume I need a switch then. I will need to plug in this switch then take lan cable insert into socket which gives me internet then plug other side of the cable into switch, is this right? Then i add tv and firestick via lan cables as well. Will i still max out 80mbps with a switch?

Thanks.

EDIT 2 - This is how it looks downstairs.

https://imgur.com/a/lMRog0n is this a bridged connection?
 
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That's local network address, so you could likely have at least dozens and dozens devices sharing connection.

Network switch is active "smart" device and knows what IP adress device is connected to what port.
So it doesn't matter into what port you connect them.
Any traffic sent to outside LAN address space is always addressed first to router (that gateway in ipconfig) and switch always routes it into router's port.
Same for answer from web server of the page you want to visit...
Which is actually sent to public IP of router, which then checks if that transmission is answer to request/transmission from LAN, before passing it through and routing it to correct LAN IP.

Because of that intelligence, devices using different pair of ports could actually have own communication between them going on simultaneously.
Old "hubs" were again dumb devices which just repeated transmission coming into single port to all other ports.
(and single transmission would always prevent any other simultaneous traffic in LAN)

Auto MDI/MDIX tells that ports of the switch automatically detect what kind cable is used for connection.
Before that (and Gbit ethernet) you needed crossover cable to connect two same "type" devices. Like if you wanted to add another switch to expand network.



That's some shoddily made cables, when outer sleeve doesn't reach into connector to minimize pull on actual wires...
 
Yikes with that picture on so many levels. There's a blue box in that picture that I think is a switch if you want to know what one looks like. You need one on the end of your cable - like the one @EsaT linked to. Doesn't matter which physical ports any of the cables go into from your devices or from the feed.
 
When electricians install network cables...

The house we moved into last year the regular telephone cabling looked like that only at least 3 different gauges from really thin stuff to chunky mains grade stuff :( the best thing to do was just cut the line off at the wall (BT engineer installed a new master socket as we couldn't find one) and do a new internal run and rip the rest out at our leisure - it was holding the FTTC connection back to half its downstream and 1/5th its upstream!
 
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