Aging effect on bulk cables

MD ELEKTRONIK at the International On-board Power System Congress in Ludwigsburg


How will the future of automotive on-board power systems look like? Which requirements and mega trends are to be expected? These and many other questions were the topics of the “7th International Conference Automotive Wire Harness” which took place in the middle of March 2018 in Ludwigsburg (Germany). Besides numerous presentations from top-level speakers of the automotive industry, Johannes Trä, Director Development at MD ELEKTRONIK, presented the findings of the “Aging Effects on Bulk Cables for Ethernet Applications” within the framework of the annual industry meeting.

Continuously Increasing Data Rates

Connectivity is one of the most important mega trends of the automotive industry. For a secure realization, a powerful and reliable network is required. “The future E/E-vehicle architecture will require bus systems with considerably higher data rates than those currently available”, emphasized Johannes Trä during his presentation. “For high-resolution displays and camera systems, data rates which can only be achieved by gigabit Ethernet are already required. For future backbones in vehicles, another increase in data rates will be required.” The necessary cables were examined and tested at MD ELEKTRONIK.

Advantageous Findings

The presented findings and solutions were gained within the framework of an examination of unshielded (UTP) and shielded (STP) cables for the Automotive Ethernet. During this examination, the RF and EMC behavior such as the insertion loss and the shielding efficiency were measured. “Shielded cables are hardly vulnerable to radio frequency aging effects due to chemical reactions. However, a foil shield may age very strongly, as bending tests, which were carried out in our accredited test laboratory, showed. If such effects occur during the vehicle service life, we will lose the radio frequency performance”, is one of the results which were presented by Johannes Trä. New solutions are required such as special Coax cables or shielded pair cables in order to be able to ensure the security of electronic on-board power systems.

The outlook on possible alternatives and the state of the specification of the future MultiGig Ethernet completed the interesting presentation and enabled the expert audience to gain valuable insights into the development and service portfolio of MD ELEKTRONIK. Johannes Trä was pleased with the response: "Our presentation was very well received and we got a lot of positive feedback." Gerd Mittermaier, Global Vice President Research & Development at MD ELEKTRONIK, was also very satisfied: “A reliable network is a decisive factor for the increasing digitization of mobility which we enable with our service portfolio. Furthermore, the long-term consideration of functionality becomes more important within the framework of the functional safety. The positive response of the expert audience shows that we are on the right track and that we have our finger on the pulse.”