There’s NO WAY this works - Debunking bogus network splitters.

try to connect 2 different wifi routers to the same computer. by using the network splitter you built

what about having 2 different lan cables plugged in to 1 pc?

I bought one on Amazon that worked, just has a slower connection for both

I wanna see how it works when you try it the opposite the 2ethernet port has 2 wifi then plug it to a pc.

About 4 years ago I had ( a very uncommon) situation that couldn’t be solved just by adding a switch so I built a couple of splitters like the ones Linus made on the second half of the video.

In the laundry room I had the ISP modem > router > 16 ports switch > patch panel . Obviously The latter distributing the connections around the house

One of those connections went to the main bedroom where I had an Apple TV AND a TV decoder (rom the same ISP supplier. There was only 1 Ethernet jack below the TV.

The problem was that the I really wanted to connect by wire the Apple TV and the tv decoder needed to be connected to a “special” port in the modem independent from the “regular “ Ethernet ports.

So then the splitters were used to do two connections: from the special modem port to the tv decoder and from the switch to the Apple TV.

As you can see Using a switch was not a solution whereas this bizarre thing solved it.

Bottom line is these products, both one-to-two RJ45 couplers and one-to-two Fast Ethernet splitters do work, but the buyer needs to be aware of the difference (both between the two identical variants and why a network switch is nearly always the preferable solution) and that many sellers don't accurately represent what they're selling, either intentionally or out of ignorance. Know what you're looking for and buy a product that explicitly includes a pin mapping, or clearly demonstrates use.

As for practical uses, a Fast Ethernet splitter can be handy for basic streaming setup at a TV location, where a single wall outlet is available but you have a couple Ethernet-capable boxes. Employing a pair of these splitters at each end of the CatX line to get both boxes networked may not save much money, but it may be preferable to adding another powered device at the TV location.

Use cases for the one-to-two RJ45 coupler are fewer, because, yeah, the whole "only one device powered at at time" constraint is pretty insane. Personally, I found value in using a pair of such couplers because it allowed me to easily create a pair of 2-line phone+Fast Ethernet splitters simply by creating a custom 4-wire-only Fast Ethernet patch cable ([1278] to [1236]) allowing me to get our Ooma base station both networked (matching the Fast Ethernet capability of the Ooma network port) and its phone line interconnected to our central phone block via a single CatX cable.

The video, though entertaining, wasn't very informed or informative.

ama using this for CCTV. Works great.

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Linus nobody said 100 megabit was slow

Actual Ethernet “splitters” do exactly what you did, and split 4 along each line. And I have seen applications where it was the most practical solution, where we had a buried line under asphalt and needed to have two physically separated connections.

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A new thought occurred to me. I have actually used this successfully. I do remember reading that it technically violates the ethernet spec, primarily in that it may introduce crosstalk in very long lines, reducing the 100 meter maximum. In practice, I’ve used it to about 25m. Ad in most hacks, your mileage may vary.

Its not uncommon in live audio/lighting situations to transmit analog signals like dmx512 or balanced audio over cat 5 using products like the sneaksnake. These splitters could prove useful in such systems

Oh and btw, I think you only need one of the half duplex splitters you made. The switch should be able to cope with that. single cable from switch to wall. Then splitter from wall to equipment in the garage.

Stunning they go to the effort of creating these splitters and didn't just wire them for half duplex. I guess maybe it's a few cents cheaper and they know they are going to sell hundreds of them to unsuspecting people.

Note there are now 2-port switches on Amazon described as 'splitters' for marketing purposes.

This pisses me off every time I read negative comments on Amazon for these products... These products are just what they are: splitters, therefore pin 1 is connected to pin 1, etc... Sellers are guilty no to mention better that this will not work as some people might expect it to work, as this involves some custom wiring to separate the pairs on both ends. Buyers who don't know basic electronics don't understand how signals flow, which pairs are used for what, and don't make use of the four pairs: they get frustrated because their product doesn't work, and they leave a negative comment. Those who are not technical should ask a basic electronician relative or geek friend to craft them 4 custom Ethernet cables for both ends if they decide to buy these splitters. In some cases they are useful, for instance I bought 2 of those to convey 2 distinct signals over an Ethernet cable (local Ethernet network + analog phone line signal). An Ethernet switch wouldn't have worked. Separating the phone and the Ethernet successfully with custom cables worked fine with these splitters. They are not a "scam". Problem is both the seller who doesn't explain properly, and the buyer who doesn't know about Ethernet wiring (a simple search for "RJ45 pinout" provides the information).

Do a Poe splitter break down

Early 2000's Double headed snake anyone? Those were the days...

I use a splitter for my TV and receiver, it just give me 100mbit/s on each. And since both endpoint only have 100mbit/s interfaces, I don’t care

Talk about what's going with the employees

I'm confused. I have an active splitter where I have 3 simultaneous connections and it works just fine

do not plug in to enterprise network please :) switches will notice you mac problems :)

Well i found one from old days laying around, but it really safed me setting up my new 3d printer as i had no cable that was long enough so i just took 2 3m cables and combined them with the old adapter and done 6m lan...
Not how they say they should be used but a good use case

Great Explain. Thank you So much🙂🤝

Very nice and amazing video

You can also daisy-chain a few computers by conecting the TX to RX signal of all computers and retunring to the first one. More or less like token ring !

I have the "ethernet splitter" working fine providing both of the things with internet over one single cable.

What a great video

I already use this trick to my lan network single cable i used for multiple connection

Use a switch

mine works

bro 100 mpbs is a blessing, i only average 15 Mbps.............

I bought One of these on a local cable store a year or so ago and it works flawlessly. It was less than 1€ btw. 👍 I do not have a gigabit connection though. Not sure but I believe it would split a full gigabit connection. Forgot to mention, it also feels cheap af. It works though 🤷😂

Oh those were known as "collider" splitter.
They could work some time ago, when the devices were much less smart.

They worked as a dumb hub (not switch!) by hoping that two devices won't transmit at the same time, and if they did it caused a "collision" so the devices detected it and tried to retransmit later.

The difference from an actual hub was that a network collision only meant the packet won't go through - or only one of them will (higher numbered ports got a priority). Whereas this plug sends reverse voltages during such an event relying on built-in protection to save the devices from being fried. Of course if such protection was not built in, some very cheap very early devices could in fact die, although more likely just failed to function.

Nowadays devices don't expect dumb hubs and re-transmitting a thousand times to local network at all, and a discrepancy is seen as a network connectivity loss. Sometimes you can configure that behavior in driver configuration and OS configuration, but I don't think Windows is capable of that anymore.

disclaimer: I'm a sysadmin but not a networking expert in any capacity so what I wrote may be not very accurate - don't quote me, I never used one of those - resorting to Linus's 100MB splitters in dire need.

In fact, in Russia old informal networks were wired in such a way because most of our houses were built in USSR only expecting at most a 1-pair phone cable to each flat, and a single TV and radio cable for entire house, so in most cases there was no space for additional 30-something cables. Switches were also too expensive and prone to being stolen to put them on every floor, especially if there were like 2-5 different internet providers in the same building who couldn't use each other's connection. Pulling a cable often involved a lot of oil and considerable force. So branching.off an existing cable was often the only viable option. Until a decade ago internet speed more than 100Mbit was not even an option most providers would offer.

You can get from high end computer vender they do sell splitters that to work, and are normal are send and receive modules. These are extremely popular add-ons in the point of sell computers and they are preferred over switches, especially in areas. They are prone to afternoon thunderstorms. With locations like this with the power flickering off and on if there’s not battery back ups on everything, the network can get split into two networks are some people call an ARP bubble were multiple networks switches cannot see each other. The only way to resolve this is to power down all devices. All networks switches for five minutes then bring them up in the correct order. These are great connect multiple locations or remodels to one centralized networks switch. Again as you said they are 100 Mbps are 10 Mbps, which in this network configuration is perfectly fine enough ❤bandwidth for everything to work with no delays.

I had a Radio Shack splitter. It did work, kind of. When used with 2 devices, if either of them were using network a lot (such as downloading newest Ubuntu), collision will occurs often and the speed will drop a lot. But when there's light traffic, those worked well. I connected 2 networked printer with Radio Shack splitter and didn't have any issue with that splitter.

The $9 option still provides up to 100 Mbps, so it's not worth considering.

I found one that works. However it has to be connected to power which makes think it works as a small router.

This almost goes back to the days of crosscable connections :P

Honestly, 100Mbps is perfectly fine for most simple applications, but like you said, why would you 'cheapen' out on something fixed so easily...

When I saw one of those "splitters" I immediately thought that it would only be able to serve one device at a time.

So my area 100meg is high speed internet 🤣 my old house I got 2-4 Meg. Im in nw ohio

Would the use case scenario for these not be for splitting a video over Ethernet signal to 2 displays?

My previous chief used to buy 2 splitters for 10€, 5 years ago

I dared say to him that we could have 5 ports 100mbps for 10€ , and not have 2 single points of failures on one cable, but rather one, cheap and easily replaced
He denied the idea

His director didn't, and threw away both the splitters and my chief "buy" rights

They're selling hubs

It might worked on the obsolete ISDN protocol.