The JBX01976 100BASE-EX SFP Transceiver represents enterprise-grade optical connectivity engineered for demanding network infrastructure requirements. This single-mode fiber transceiver combines advanced performance with proven reliability, delivering consistent 100Mbps data rates with exceptional reach capabilities. **Key Technical Specifications:** Operating at 1310nm wavelength, this SFP module achieves impressive 40km transmission distances over standard single-mode fiber (SMF), far exceeding typical short-reach transceiver capabilities. The 9/125 micron fiber core provides optimal light transmission and signal fidelity. The duplex LC/UPC connector design ensures secure, low-loss connections with excellent back-reflection performance (-50dB typical). **Performance & Reliability:** Fully IEEE 802.3u compliant, this transceiver delivers 100BASE-EX performance standards with robust error detection and correction. Operating temperature range of 0-70°C accommodates both indoor data centers and outdoor network installations. The module's metal case construction provides superior electromagnetic shielding and thermal management. **Safety & Compliance:** This product adheres to the highest safety standards with Class 1 laser certification, TUV, UL, and FDA compliance (21CFR 1040.10). RoHS/ELV directive compliance ensures environmental responsibility without compromising performance. **Juniper Compatibility:** Designed as a direct replacement for Juniper EX-SFP-1FE-LX40K modules, this transceiver integrates seamlessly into existing Juniper EX series equipment. Custom brand programming is available for OEM applications. **Applications:** Ideal for enterprise campus networks, metropolitan area networks (MANs), and inter-building connectivity. Perfect for network operators requiring cost-effective long-distance fiber optic transmission without premium pricing. **Warranty & Support:** Includes 90-day limited warranty. Ships from strategically located U.S. facilities with free standard shipping on qualifying orders over $99. Manufactured to exacting standards in Vietnam and China.