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Most of the CAN bus/CAN Open physical layer options use twisted-pair copper cable with common ground. Between each of the cables there is a 120 Ohm resistor to stabailize stabilize the voltage and lessen external noiceexternal noise.

There is not really an official standard for Can Bus as each company uses their own internal standardization

The predominant choice for the physical layer of CAN bus and CAN Open communication involves employing twisted-pair copper cables with a shared ground. In this setup, a pivotal component is the inclusion of a 120 Ohm resistor positioned between each cable, serving to enhance voltage stability and mitigate the impact of external noise.

It's worth noting that the realm of CAN Bus lacks a universally accepted standard. Instead, each enterprise adopts its unique internal standardization approach, fostering adaptability and tailoring to specific requirements.