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Split Ethernet cable - two devices on one twisted pair

the_eye777 32307 25
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How can I connect a PS4 to the internet using the existing modem-to-router Ethernet cable without running a new long cable?

Buy a pair of RJ45 LAN splitters and use them to turn one 8-wire Ethernet run into two separate 4-wire links, each limited to 100 Mb/s [#16185001][#16185212][#16185338] Put one splitter at each end of the existing cable, so one link can stay between the modem and router while the second link carries the Ethernet connection back to the PS4 [#16186461] If needed, add short RJ-45 patch cords, and you can also make the splitters yourself with a crimping tool and RJ-45 plugs [#16186270]
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  • #1 16184695
    the_eye777
    Level 14  
    Posts: 240
    Rate: 50
    Hello.
    I have a Toya modem in one room.
    From it comes the cable to the router in the other room.
    I have a PS4 in this room with a modem.
    I need a cable to connect the internet to the ps4, but from the modem.
    What do I need to buy to connect the modem router to the line and bring the cable to the console?
    I know I could from the router, but then I would have to run a 10m cable in the strips and through the wall and that's too much of a hassle.
    Please help.
    Regards [/ code]
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  • #2 16184710
    dedito
    Level 39  
    Posts: 4770
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    Buy a LAN splitter, cost ~ 10 PLN or make it yourself.
    You can find the diagrams in the search engine.
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  • #3 16184898
    the_eye777
    Level 14  
    Posts: 240
    Rate: 50
    I see.
    It's cool how such a low cost
  • #4 16185001
    m.jastrzebski
    Network and Internet specialist  
    Posts: 5238
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    the_eye777 wrote:
    Hello.
    I have a Toya modem in one room.
    From it comes the cable to the router in the other room.
    I have a PS4 in this room with a modem.
    I need a cable to connect the internet to the ps4, but from the modem.
    What do I need to buy to connect the modem router to the line and bring the cable to the console?
    I know I could from the router, but then I would have to run a 10m cable in the strips and through the wall and that's too much of a hassle.
    Please help.
    Regards [/ code]


    As above. 2 x RJ45 splitter. Just a small note. If I got you right.
    From two such distributors, you will make 2 100mbit connections in one cable.

    And now with this 100mbit connection you connect the modem output with the router's WAN input.
    And with the second cable you connect one of the LAN sockets of the router and "Return" to it, near the modem, connect it to the PS4.
  • #5 16185166
    hermes-80
    Level 43  
    Posts: 12013
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    From the modem you will not connect to the PS if you have a router. - As a colleague wrote above, such a combination of the return signal should be made with the router's WAN cable - it can be done as much as possible, you just have to surprise the idea itself.
  • #6 16185181
    the_eye777
    Level 14  
    Posts: 240
    Rate: 50
    Well, I don't have to buy anything, only pull the cable from the router and that's it
  • #7 16185185
    m.jastrzebski
    Network and Internet specialist  
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    the_eye777 wrote:
    Well, I don't have to buy anything, only pull the cable from the router and that's it
    This is how I understood you that you do not want to pull this cable because it is related to some demolition, forging or drilling.
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  • #8 16185188
    the_eye777
    Level 14  
    Posts: 240
    Rate: 50
    Well, my point is to leave the modem
  • #9 16185194
    m.jastrzebski
    Network and Internet specialist  
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    the_eye777 wrote:
    Well, my point is to leave the modem

    It was you Hermes who wrote that you can't get out of the modem.
  • #10 16185195
    the_eye777
    Level 14  
    Posts: 240
    Rate: 50
    Well, once that I am far from the router, and two that I would have to hide the entire cable under the slats

    Added after 1 [minutes]:

    Well, I understood that I can not leave the modem.
    And what would I have to connect a modem router on the line to get out of this? Second router? Because I have one not used at the moment
  • #11 16185212
    m.jastrzebski
    Network and Internet specialist  
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    the_eye777 wrote:
    Well, once that I am far from the router, and two that I would have to hide the entire cable under the slats

    Added after 1 [minutes]:

    Well, I understood that I can not leave the modem.
    And what would I have to connect a modem router on the line to get out of this? Second router? Because I have one not used at the moment

    You have to buy 2x splitter for a few zlotys.

    The cable you have connected to the modem -> the router has 8 wires inside. You use 4 wires to connect the modem + router.

    You use the remaining 4 wires to release the connection from the router in the other room from the LAN socket.

    Splitter only splitter of 8-wire cable into two 4-wire plugs.
  • #12 16185308
    the_eye777
    Level 14  
    Posts: 240
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    Oh, now I understand.
    It is on one cable that the signal will be distributed
  • #13 16185338
    m.jastrzebski
    Network and Internet specialist  
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    the_eye777 wrote:
    Oh, I understand now.
    It is on one cable that the signal will be distributed

    NOTHING will break apart there. The signal "splits" the router. On different wires inside the twisted pair, you will make 2 different connections in a way that is totally independent of one another. As if you had 2 cable to connect the router to the PS4.
    As if you wrap 2 cables in one insulation.
  • #14 16185422
    the_eye777
    Level 14  
    Posts: 240
    Rate: 50
    Approx.
    How do I buy these 2 distributors, how should I connect them?
    And how are these distributors supposed to look like? Are they to have only female entrances or what? Because there are some of them on the net and there are those with 1 plug and 2 inputs
  • #15 16185436
    m.jastrzebski
    Network and Internet specialist  
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    the_eye777 wrote:
    Approx.
    How do I buy these 2 distributors, how should I connect them?
    And how are these distributors supposed to look like? Are they to have only female entrances or what? Because there are some of them on the net and there are those with 1 plug and 2 inputs

    I connect yes. I take the splitter in my left hand into my right cable and press it and I will hear "click".

    And for real. Take se and draw what you have been translated 5 times, so it couldn't be easier. If you don't know from the drawing, I won't be able to help; (
  • #16 16186270
    LucekB
    Network and Internet specialist  
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    Split Ethernet cable - two devices on one twisted pair
    You can buy 2 such splitters and then you need 4 more short RJ-45 LAN cables (patchcord) and plug the cables from the socket.

    Instead of a splitter, you can do it yourself with a crimping tool and RJ-45 terminals, where you can buy one for home works for PLN 20-30.
  • #17 16186292
    dedito
    Level 39  
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    LucekB wrote:
    You can buy 2 such splitters and then you need 4 more short RJ-45 LAN cables (patchcord) and plug the cables from the socket.
    These splitters still need to be converted to serve as LAN splitters.
  • #18 16186321
    LucekB
    Network and Internet specialist  
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    They will be described with splitters and this is what the author of the post should stick to: the_eye777
    Such as these
    Split Ethernet cable - two devices on one twisted pair
  • #19 16186461
    dedito
    Level 39  
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    the_eye777 wrote:
    how should I connect them?

    So in a way, on the example of the photo above:
    1. You are buying a set of such splitters (they are sold in pairs).
    2. Disconnect the cable from the modem and connect it to the LAN socket in the first splitter.
    3. Connect the modem cable to PC1 (in the place where the router cable was previously)
    4. Connect the PS4 cable to PC2
    5. Disconnect the cable from the router and connect it to the LAN socket of the second splitter.
    6. To PC1 you connect the router cable to the WAN port (in the place where the modem cable was previously)
    7. Connect the cable to the router to the LAN port to PC2.
  • #20 16186492
    hermes-80
    Level 43  
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    What is your internet bandwidth from ISP? Because if it turns out that 250Mb / s, you will shoot yourself in the knee with these splitters and all this smack.
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  • #21 16186510
    nici
    VIP Meritorious for electroda.pl  
    Posts: 4961
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    Why so much trouble, if the PS4 has WiFi, which, by the way, is better than LAN?
  • #22 16193708
    the_eye777
    Level 14  
    Posts: 240
    Rate: 50
    nici wrote:
    Why so much trouble, if the PS4 has WiFi, which, by the way, is better than LAN

    It has WIFI, but I have a download speed of 3-4Mb wirelessly and 10 on the cable.
    Ok, I know everything. Thanks a lot for your help.
    Tomorrow I will get it when I buy these tees.
    And I have 100Mb net
  • #23 16193722
    jprzedworski
    Network and Internet specialist  
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    And not better to give a switch?
  • #24 16193735
    nici
    VIP Meritorious for electroda.pl  
    Posts: 4961
    Help: 266
    Rate: 977
    the_eye777 wrote:
    nici wrote:
    Why so much trouble, since the PS4 has WiFi, which, by the way, is better than LAN

    It has WIFI, but I have a download speed of 3-4Mb wirelessly and 10 on the cable.
    Ok, I know everything. Thanks a lot for your help.
    Tomorrow I get on with it when I buy these tees.
    And I have 100Mb net


    I have identical connection parameters.
  • #25 16193913
    Przemek2011
    Level 17  
    Posts: 308
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    It's not easier to move this router to the place where the modem is?
  • #26 16195620
    the_eye777
    Level 14  
    Posts: 240
    Rate: 50
    Przemek2011 wrote:
    it wouldn't be easier to move this router to the place where the modem is

    I live in a block of flats, there are probably about 20 networks around, each generating interference. In the place where it stands now, I have the best range in the whole apartment, it does not break my connections, etc.
    Subject solved.
    Can be closed.
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Topic summary

✨ The discussion revolves around connecting a PS4 to a Toya modem using a LAN splitter instead of running a long cable from the router. Users suggest purchasing two RJ45 splitters to utilize the existing Ethernet cable, which contains eight wires. Four wires will connect the modem to the router, while the remaining four will allow a connection from the router to the PS4. The setup involves disconnecting the modem cable from the router and using the splitters to create two independent connections. Some users also mention the possibility of using a switch instead of splitters and discuss the limitations of WiFi in terms of speed compared to wired connections.
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FAQ

TL;DR: Splitting a Cat5e run lets two 100 Mbps links share one cable because 100BASE-TX uses only 2 of 4 pairs (“You will make 2 100 Mbit connections in one cable.” [Elektroda, m.jastrzebski, post #16185001]; [IEEE 802.3u]).

Why it matters: You can avoid drilling walls and still get wired speed to both router and PS4.

Quick Facts

• 100BASE-TX uses pairs 1-2 and 3-6 only, leaving two pairs free [IEEE 802.3u]. • RJ45 splitter pair costs approx. 10–20 PLN (US $3–5) [Elektroda, dedito, post #16184710] • Maximum segment length stays 100 m at 100 Mbps after splitting [TIA/EIA-568]. • Gigabit (1000BASE-T) needs all four pairs, so splitters force 100 Mbps [IEEE 802.3ab]. • DIY crimping kit for custom splitters: 20–30 PLN [Elektroda, LucekB, post #16186270]

Can I run two Ethernet connections over one Cat5e cable?

Yes. A Cat5e has four twisted pairs. 100BASE-TX uses only two pairs, so the remaining pairs can carry a second 100 Mbps link [IEEE 802.3u]. Splitters at both ends map each 4-wire set to its own RJ45 jack [Elektroda, m.jastrzebski, post #16185212]

What speed will each split link support?

Each path negotiates up to 100 Mbps. The cable cannot provide 1 Gbps when pairs are divided [IEEE 802.3ab]. In the thread, the user confirmed a 100 Mb ISP plan, so no bottleneck occurred [Elektroda, the_eye777, post #16193708]

Which wires carry the two signals?

Link 1 uses pins 1-2 (pair 1) and 3-6 (pair 2). Link 2 usually re-uses pins 4-5 and 7-8 (pairs 3 and 4) [IEEE 802.3u]. Splitters route these pairs into separate plugs [Elektroda, dedito, post #16186461]

What hardware do I need?

Buy one pair of LAN splitters (sold as a set) and four short patch cords. Cost is roughly 10–20 PLN for splitters and 5–10 PLN for cords [Elektroda, dedito, post #16184710]

How do I connect the splitters correctly?

Follow this 3-step sequence:
  1. Near modem: plug building cable into splitter port LAN, run patch cords from PC1 → modem, PC2 → PS4.
  2. Near router: plug other cable end into second splitter LAN, run patch cords PC1 → router WAN, PC2 → router LAN.
  3. Power devices; links should show 100 Mbps [Elektroda, dedito, post #16186461]

Will Gigabit Ethernet still work after splitting?

No. Gigabit needs all four pairs for data and echo cancellation [IEEE 802.3ab]. Switches will downshift to 100 Mbps; throughput caps at ≈94 Mbps net [Pang et al., 2015].

Could I just add a switch instead?

Yes, placing a small unmanaged switch (≈40 PLN) near the modem gives multiple full-speed ports without rewiring. It still needs one free cable pair, so you may face the same pulling issue [Elektroda, jprzedworski, post #16193722]

Is Wi-Fi really slower than a split cable?

In congested apartments, 2.4 GHz Wi-Fi often drops below 10 Mbps due to interference [Cisco, 2021]. The thread author measured 3–4 Mbps on Wi-Fi versus 10 Mbps on cable [Elektroda, the_eye777, post #16193708]

How much does a DIY solution cost?

A crimp tool plus four RJ45 plugs costs 20–30 PLN [Elektroda, LucekB, post #16186270] If you already own tools, the extra plugs cost under 2 PLN total.

What edge cases cause this setup to fail?

If your ISP upgrades speed above 100 Mbps (e.g., 250 Mbps plan) the split cable becomes the bottleneck [Elektroda, hermes-80, post #16186492] Also, Power over Ethernet will not pass through many passive splitters, risking device power loss PoE Guide."

Does splitting increase crosstalk or cable length limits?

No significant change occurs. The same pairs still follow TIA/EIA crosstalk limits, and 100 m remains the maximum segment length [TIA/EIA-568].

How can I revert to full Gigabit later?

Remove both splitters and connect the cable directly to one device; or pull a second Cat5e. Restoring all four pairs lets devices auto-negotiate 1 Gbps again [IEEE 802.3ab].
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