App note from NXP introducing their network solution TJA1101B to handle Ethernet in automotive environment. Link here (PDF)
The TJA1101B is a 100BASE-T1 compliant Ethernet PHY optimized for automotive use cases. The device provides 100 Mbit/s transmit and receive capability over a single unshielded twisted pair cable, supporting a cable length of at least 15 m. Optimized for automotive use cases like IP camera links, driver assistance systems and back-bone networks, the TJA1101B has been designed for automotive robustness and ISO 26262 ASIL-A compliance, while minimizing power consumption and system costs.