How to split 1 ethernet cable into 2 without a switch or splitter
kind of an odd situation I am trying to figure out. This isn't your typical type of network with an ethernet cable split into 2 and I am aware of the use of a splitter and or switch but neither of those solutions will work in this case. Please help if you can or tell me if this will work.
Basically I have a computer that is installed in a vehicle. This computer has 4 ethernet pins dedicated to RX+, RX-, TX+ & TX-. The use of these 4 pins are to wire in an ethernet cable so the device can be plugged into a PC or laptop to be able to access the firmware and transmit / receive data.
What I am trying to do, is have the option of still having the ethernet cable to be able to plug it into the laptop, but at the same time the car will have a wifi router installed so a connection to the vehicle computer can be made from the PC without the need of plugging directly in and having a wireless connection.
Is it possible to splice each of the individual ethernet pins on the vehicle computer into 2? So 1 ethernet cable will go to the router, the other will be plugged into the laptop. I should also mention that nether cables will be used at the same time ever. The router will only ever be switched on when a wireless connection is needed and also the connection to the laptop PC will rarely need to be used. The wire going to the router will also be in a very tight location hard to reach so it will not be as simple as just using the same cable for the laptop and plugging it into the router and vice versa.
I think this will work, but I cant seem to find the answers anywhere as its not your typical type of ethernet network. Hopefully it makes sense what Im trying to do and somebody can help with this. Thank you very much.
61 Answer
Well , you can try , but the extra wire can cause interference. From a simplistic resistive circuit point of view, sure it looks fine, but it is a high frequency circuit. With inductance and it’ll act like an antenna I wouldn’t do it. I'd just run two cables still its probably only 10meg so yes personally I'd find it hard to join the wires so I'd buy a coupler which will take one rj45 in and connect two in parallel don’t get the splitters these take 8cores and put 4 to one out and 4 to the other. I have both so I know they exist
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