With the advancement of CASE technologies, particularly automated driving, the demand for high-volume information processing devices like LiDAR is increasing, necessitating faster in-vehicle data communication. Sumitomo (SEI) Electronic Wire, Inc. is actively engaged in developing and manufacturing information transmission sub-harnesses that comply with new global communication standards to enable high-capacity data communication. Additionally, the company has developed automated processing equipment for the efficient production of widely used connectors in sub-harness processing. This paper provides an overview of in-vehicle equipment trends, communication standards, and our wire and terminal processing technology, which are integral to high-speed communication sub-harnesses that connect these devices. © 2024 Sumitomo Electric Industries Ltd.. All rights reserved.