The JBX02179 1000BASE-BX40-D SFP Transceiver represents a premium solution for extending network reach across single-mode fiber infrastructure. Engineered to support 40-kilometer transmission distances, this module is specifically designed for organizations requiring long-distance gigabit connectivity without the expense of additional amplification equipment. **Key Features & Specifications:** This transceiver operates at 1GB data rates using 1550/1310nm wavelengths in a simplex configuration, allowing bi-directional communication over a single fiber strand. The 9/125 micron single-mode fiber core ensures signal integrity across extended distances. With dimensions of 5x4x2 inches and a compact SFP form factor, installation integrates seamlessly into existing network infrastructure. **Compatibility & Performance:** Direct replacement for Cisco's GLC-BX40-D-I module, this unit maintains full compatibility with Cisco networking equipment while delivering identical performance characteristics. The simplex LC/UPC connector provides positive retention and minimal insertion loss, critical for maintaining signal quality over 40km spans. **Reliability & Certification:** Manufactured with quality standards from Vietnam and China, this module meets rigorous compliance requirements including RoHS/ELV directives and EU Directive 2002/95/EC. Safety certifications include Class 1 Laser, FDA 21CFR 1040.10, TUV, and UL approvals, ensuring safe operation in enterprise environments. The extended operating temperature range of -40 to 85°C (-40 to 185°F) accommodates both indoor and outdoor deployment scenarios. **Applications:** Ideal for metropolitan area networks (MANs), point-to-point links, and campus interconnects. Perfect for telecommunications carriers, ISPs, and enterprises building resilient fiber networks. The 90-day limited warranty provides additional peace of mind for mission-critical deployments. **Shipping & Support:** Enjoy free standard shipping on orders exceeding $99, with convenient fulfillment from Danville, CA or Beaufort, SC locations. Custom brand programming available for organizations requiring white-label solutions.