The JBX01259 40GBASE-PSM4 QSFP+ transceiver represents a premium solution for organizations requiring high-capacity, long-distance optical networking capabilities. This parallel single-mode (PSM4) transceiver is specifically engineered to meet the demanding requirements of modern data center architectures and enterprise networking environments. **Technical Specifications:** Operating at 1310nm wavelength, the JBX01259 transmits data at 40Gbps over distances up to 10 kilometers using standard single-mode fiber (SMF-28 compatible, 9/125μm core diameter). The module adheres strictly to IEEE 802.3ba and SFF-8436 standards, ensuring compatibility with certified network equipment and future-proof interoperability. **Connector Technology:** Equipped with MTP/MPO-12/APC connectors, this transceiver enables efficient parallel fiber connectivity, reducing space requirements and improving cable management in high-density network deployments. The APC (angled physical contact) design minimizes back-reflection losses, critical for maintaining signal integrity over extended distances. **Build Quality & Safety:** Constructed with a durable metal case housing and featuring an integrated laser transmitter assembly, the JBX01259 withstands demanding operational environments. It meets all relevant safety certifications including Class 1 Laser certification (LN #50 7/2001), TUV, UL, and FDA 21CFR 1040.10 compliance. Full RoHS and ELV directive compliance ensures environmental responsibility. **Compatibility & Deployment:** Designed as a direct replacement for Juniper JNP-QSFP-4X10GE-LR and QSFPP-4X10GE-LR modules, installation is straightforward. The transceiver supports custom brand programming for OEM applications and white-label deployments. Operating across 0-70°C temperature ranges, it performs reliably in both climate-controlled data centers and field-deployed equipment. **Applications:** Ideal for campus area networks (CANs), metropolitan area networks (MANs), data center interconnects (DCIs), and carrier-grade deployments requiring extended reach without regeneration. Perfect for organizations consolidating multiple 10GbE connections into higher-capacity 40G infrastructure. **Warranty & Support:** Backed by a 90-day limited warranty and featuring free standard shipping on qualifying orders, the JBX01259 offers exceptional value. Ships from multiple US locations (Danville, CA and Beaufort, SC) ensuring rapid delivery.