The JBX02221 1000BASE-EX SFP transceiver represents a critical component for telecommunications infrastructure requiring extended-range Gigabit Ethernet connectivity. This optical transceiver module is specifically designed to deliver 1GB data transmission capabilities over single-mode fiber (SMF) distances of up to 40 kilometers, making it ideal for metropolitan area networks (MANs) and long-distance inter-building connections. **Key Technical Specifications:** Operating at 1310nm wavelength with a 9/125 micron single-mode fiber core, this module ensures minimal signal attenuation and superior optical performance. The duplex LC/UPC connector provides a compact, industry-standard interface compatible with existing fiber infrastructure. Qualified to IEEE 802.3z specifications, the transceiver guarantees interoperability with standards-compliant network equipment. **Compatibility & Integration:** This module is engineered as a direct replacement for Cisco GLC-EX-SMD transceivers, ensuring plug-and-play compatibility with Cisco network switches, routers, and optical equipment. Network administrators can confidently deploy this solution in heterogeneous environments without requiring firmware updates or reconfiguration. **Reliability & Compliance:** Constructed with a protective metal case and precision laser transmitter, the JBX02221 withstands demanding operational environments. It operates across temperatures from -10°C to 85°C, accommodating both climate-controlled data centers and outdoor installations. Multiple safety certifications—including Class 1 Laser classification and UL/FDA compliance per 21CFR 1040.10—demonstrate adherence to international safety standards. Full RoHS and ELV compliance reflects commitment to environmental responsibility. **Enterprise Applications:** Ideal for telecommunications companies, ISPs, data centers, and enterprise networks requiring extended-range connectivity without additional signal regeneration equipment. The 40km transmission distance eliminates the need for intermediate amplification over significant geographic distances. **Warranty & Support:** Each module includes a 90-day limited warranty. Custom brand programming is available for enterprise deployments. Free standard shipping applies to orders exceeding $99, with shipment available from multiple U.S. locations ensuring rapid delivery.