The JBX05154 4m Arista CAB-Q-S-4M Compatible 40GBASE-CR4 QSFP+ to 4x SFP+ Direct Attach Copper Cable is engineered for data center professionals seeking reliable, cost-effective high-speed network connectivity. This passive breakout DAC cable bridges the gap between modern QSFP+ infrastructure and legacy SFP+ equipment with exceptional performance and durability. **Technical Specifications:** Manufactured using premium 26AWG copper twinax with plastic jacketing, this cable delivers 40 Gigabit Ethernet performance across its 4-meter length. The QSFP+ male connector interfaces with four SFP+ ports, enabling efficient bandwidth distribution in modular network architectures. Full compliance with IEEE 802.3ba standards ensures compatibility across enterprise-grade equipment. **Compliance & Certifications:** The cable meets RoHS (EU directive 2002/95/EC), TUV, and UL safety certifications, making it suitable for regulated environments including healthcare, finance, and telecommunications sectors. Its passive design eliminates heat generation and power consumption, reducing operational complexity in densely packed network equipment. **Performance Advantages:** Unlike active DAC solutions, this passive copper cable provides immediate plug-and-play functionality without requiring external power sources or firmware updates. The 4-meter length accommodates typical data center rack-to-switch distances while maintaining signal integrity. Operating across 0-70°C temperature ranges, the cable performs reliably in various environmental conditions. **Application Scenarios:** Ideally suited for: • Data center top-of-rack (ToR) switch deployments • High-frequency trading environments requiring low latency • Cloud infrastructure buildouts requiring cost optimization • Server-to-switch interconnections in modular data centers • Network upgrades from 10G to 40G Ethernet architectures **Quality Assurance:** Backed by a 90-day limited warranty and shipped from strategically located distribution centers in California and South Carolina, ensuring rapid delivery. Custom brand programming is available for OEM and enterprise deployments. **Compatibility:** Directly compatible with Arista networking equipment as a replacement for OEM part CAB-Q-S-4M, this cable integrates seamlessly into existing infrastructure without requiring reconfiguration or compatibility testing.