The JBX05749 2m 100GBASE-CR4 QSFP28 Passive Direct Attach Copper Cable represents a cost-effective, high-performance solution for modern datacenter infrastructure. As an Arista-compatible alternative to original equipment manufacturer (OEM) cables like the CAB-Q-Q-100G-2M, this QSFP28 DAC delivers exceptional value without compromising reliability or performance. **Technical Specifications:** This cable meets the stringent demands of 100Gbps Ethernet transmission, qualified to IEEE 802.3bj specifications and the QSFP28 Multi-Source Agreement (MSA). The 28AWG twinax copper construction provides superior signal fidelity for short-reach datacenter connections, while the passive design eliminates the power requirements associated with active cables. **Performance & Reliability:** Operating across a wide temperature range of 0-70°C (32-158°F), this cable maintains consistent performance in various datacenter environments. The robust copper connectors ensure secure QSFP28-to-QSFP28 connections with minimal crosstalk and signal degradation. Full RoHS and EU directive 2002/95/EC compliance, combined with TUV and UL safety certifications, guarantees compliance with international standards. **Application & Compatibility:** Ideally suited for connecting Arista switches, servers, and storage arrays in high-density environments, this 2-meter DAC cable minimizes latency while reducing overall system power consumption. The 2m length provides optimal reach for top-of-rack (ToR) and end-of-row (EoR) configurations without excessive cable runs. **Why Choose This Cable:** Compared to active cables or fiber optics, passive DAC cables offer superior cost-efficiency, lower power consumption, and reduced latency—critical factors in demanding datacenter environments. The Arista compatibility ensures seamless integration with existing infrastructure. **Warranty & Support:** Backed by a 90-day limited warranty and available with custom brand programming options. Ships from strategically located US facilities (Danville, CA and Beaufort, SC) with free standard shipping on orders exceeding $99. Manufactured to exacting standards in Vietnam and China, this cable represents reliable, enterprise-grade infrastructure at competitive pricing.