The JBX02167 1000BASE-BX40-D SFP Transceiver represents a high-quality, cost-effective solution for organizations requiring extended-reach optical networking over long distances. Engineered to replace Cisco's GLC-BX40-DA-I, this module delivers exceptional performance and reliability for 40km single-mode fiber deployments. **Technical Specifications:** This 1000BASE-BX40-D transceiver operates at 1GB data rates using bidirectional wavelength division multiplexing technology, transmitting at 1490nm and receiving at 1310nm simultaneously over a single fiber strand. The 9/125 micron single-mode fiber core supports distances up to 40km with minimal signal loss, making it ideal for enterprise campus interconnects and metropolitan area networks. **Design & Construction:** The module features a robust metal case housing an integrated laser transmitter, ensuring durability and optimal thermal management. The simplex LC/UPC connector provides a standardized interface compatible with most modern network infrastructure. At just 5x4x2mm, it fits seamlessly into any standard SFP transceiver slot without requiring additional adapters or modifications. **Compliance & Certification:** Full RoHS and ELV compliance ensures environmental responsibility, while Class 1 laser certification (LN #50 7/2001), TUV, UL, and FDA 21CFR 1040.10 approvals guarantee safety and reliability in production environments. This transceiver exceeds SFF-8472 specifications for extended-reach BiDi applications beyond standard IEEE 802.3ah requirements. **Performance & Reliability:** With an operating temperature range of -40°C to 85°C (-40°F to 185°F), this module performs reliably in diverse environmental conditions. The 90-day limited warranty provides peace of mind, and custom brand programming is available for OEM applications. **Applications:** Ideal for metropolitan network connectivity, university campus interconnects, remote data center replication, disaster recovery links, and service provider networks requiring cost-effective long-distance connectivity. **Why Choose JBX02167:** Direct Cisco compatibility ensures plug-and-play installation without firmware updates or compatibility concerns. Extended 40km reach eliminates the need for expensive regenerators or additional equipment. Comprehensive certifications and compliance standards guarantee compatibility with enterprise-grade network management systems. Free standard shipping on orders over $99 makes this an economical choice for network upgrades.