I would like to run two 100 Mbit Ethernets including a common PoE over a single cable which will be about 3-5m long. Since 100 Mbit needs 4 wires I will need 8 plus some wires for the PoE which is at least 10 or better 12 wires altogether. I wont mind having even more wires (14, 16...).
Do I need a twisted pair for such cable length? Are there any standards for cables (twisted/non-twisted) with more than 8 wires that UTP has? The environment for the setup is a passenger car.
The reason I want to do this is that I am synchronizing 2 devices with Ethernet and am not able to put a switch close to them so I need to run 2 Ethernet lines down to the switch. Also, the 2 devices can't do PoE by themselves - I will inject and split the power from the cable manually by hand (and lead it to DC inputs on those devices for power). The cable I intend will have 2 RJ-45 connectors on each side plus the power lines.