The JBX01201 40GBASE-ER4 QSFP+ optical transceiver represents a cutting-edge solution for organizations requiring high-speed, long-distance network transmission. Built to IEEE 802.3ba specifications and SFF-8436 standards, this module delivers exceptional performance in demanding enterprise environments. **Technical Specifications:** This transceiver operates at 40Gbps over single-mode fiber (SMF) for distances up to 40km, utilizing 9/125 micron fiber cores. The duplex LC/UPC connector design ensures reliable signal transmission with minimal insertion loss. Operating across 0-70°C (32-158°F), the module maintains consistent performance in varied environmental conditions. **Cisco Compatibility:** As a drop-in replacement for Cisco's QSFP-40G-ER4 (OEM P/N QSFP-40G-ER4), this transceiver integrates seamlessly with existing Cisco networking infrastructure without configuration modifications. This compatibility eliminates procurement complexity and reduces deployment time. **Safety and Compliance:** Manufactured with Class 1 laser safety certifications, TUV, UL/FDA, and 21CFR 1040.10 compliance, this module meets rigorous international safety standards. RoHS and ELV directive compliance ensures environmentally responsible operation. **Construction and Durability:** The transceiver features a robust metal case housing with integrated laser transmitter technology. Compact dimensions (5x4x2 inches) facilitate easy installation in dense networking environments while maintaining thermal efficiency. **Ideal Applications:** Perfect for enterprise data centers, metropolitan area networks (MANs), campus networks, and long-haul telecommunications. Suitable for organizations requiring reliable 40G connectivity without premium pricing. **Support and Warranty:** Each unit includes a 90-day limited warranty. Custom brand programming is available for OEM and reseller requirements. Free standard shipping applies to orders exceeding $99, with products sourced from Danville, CA and Beaufort, SC locations.