自動車用イーサネット ケーブル ハーネスの設計: CAT6 と CAT7 のパフォーマンス データ

自動車システムがより高度になるにつれて, 車内での高速データ通信の需要が大幅に増加. イーサネット ケーブル ハーネスは車載ネットワークの標準となっています, 特にADASなどのアプリケーション向け (Advanced Driver Assistance Systems), infotainment systems, and autonomous driving platforms. CAT6 and CAT7 cables are the most widely considered standards for these systems. This article explores the differences in design, performance, and practical application of CAT6 and CAT7 Ethernet cable harnesses in the automotive industry.

The Role of Ethernet in Automotive Systems

Replacing legacy protocols like CAN and FlexRay

Supporting high-bandwidth data transfer

Enabling sensor fusion and real-time communication

Overview of CAT6 and CAT7 Standards

CAT6 Ethernet Cables:

Bandwidth up to 250 MHz

Data rate up to 1 Gbps over 100 meters

UTP or STP construction options

CAT7 Ethernet Cables:

Bandwidth up to 600 MHz

Data rate up to 10 Gbps over 100 meters

Always shielded (S/FTP or F/FTP)

Impact on Cable Harness Design

CAT6: Easier to handle and terminate, more cost-effective, suitable for non-critical systems.

CAT7: Bulkier and harder to bend, but ideal for safety-critical applications needing superior shielding.

Design Considerations

Bend Radius and Routing Constraints: Especially critical in tight automotive spaces.

Connector Compatibility: CAT7 often requires GG45 or TERA connectors, while CAT6 uses RJ45.

Environmental Resistance: Must meet automotive-grade thermal, chemical, and vibration standards.

テストプロトコル: Use of TDR (Time-Domain Reflectometry) and insertion loss testing to verify integrity.

アプリケーションの適合性

CAT6: Rear-seat entertainment, telematics, diagnostics

CAT7: ADAS systems, camera networks, autonomous driving modules

結論

Choosing between CAT6 and CAT7 for automotive Ethernet harnesses involves balancing performance, 料金, and design complexity. While CAT6 remains a solid choice for many general applications, CAT7 offers enhanced shielding and higher data rates essential for critical and high-speed systems. Engineers must consider the specific use case to determine the most suitable solution.