The JBX02177 1000BASE-BX40-D SFP Transceiver represents a premium solution for organizations requiring extended-reach gigabit ethernet connectivity over singlemode fiber infrastructure. With 40km transmission capability, this module enables cost-effective network expansion without intermediate equipment, making it ideal for metropolitan area networks, service provider backhaul, and enterprise campus interconnections. **Technical Specifications:** This bidirectional SFP transceiver operates at 1GB data rates using wavelength division multiplexing with transmit wavelength of 1490nm and receive wavelength of 1310nm (or vice versa depending on configuration). The 9/125 micron singlemode fiber core ensures low dispersion and minimal signal loss over extended distances. The simplex LC/UPC connector provides industry-standard connectivity with low insertion loss and excellent return loss characteristics. **Key Features:** - Extended 40km reach over singlemode fiber - Bidirectional (BiDi) transmission technology - 1GB Ethernet performance - Simplex LC/UPC connectors - Metal case construction for superior EMI protection - Precision laser transmitter for reliable signal transmission - Operating temperature range: 0-70°C (32-158°F) **Compatibility and Standards:** Juniper SFP-GE40KT14R13 compatible, ensuring seamless integration with existing Juniper networking equipment. Qualified to SFF-8472 extended-reach specifications, exceeding standard IEEE 802.3ah requirements. RoHS/ELV directive compliant and certified for Class 1 laser safety by UL, FDA, and TUV. **Applications:** Ideal for campus interconnections, metropolitan networks, disaster recovery site connections, and service provider deployments. The 40km reach reduces equipment costs while maintaining gigabit performance levels. **Quality Assurance:** Manufactured with precision engineering and rigorous quality control. Includes 90-day limited warranty. Custom brand programming available for OEM requirements. Ships from US warehouses with free standard shipping on orders exceeding $99.