The JBX01449 100GBASE-LR4 QSFP28 Transceiver represents a cost-effective solution for enterprises and service providers upgrading to 100GB Ethernet infrastructure. Designed to meet the demanding requirements of modern data center environments, this module combines high performance with proven reliability. **Technical Specifications:** Operating at 100GB per second, this transceiver utilizes single-mode fiber technology with a 9/125µm core diameter, standard across enterprise networks. The duplex LC/UPC connectors ensure low insertion loss and return loss characteristics, critical for maintaining signal integrity over extended distances. With a maximum transmission range of 10km on standard single-mode fiber, it's perfectly suited for metropolitan area network (MAN) and campus network deployments without requiring regeneration equipment. **Performance & Reliability:** The module features a robust metal case with integrated laser transmitter, operating safely within the 0-70°C temperature range. It maintains IEEE 802.3bm and QSFP28 MSA specifications, ensuring interoperability with certified equipment. Multiple safety certifications including Class 1 Laser, TUV, UL, and FDA 21CFR 1040.10 compliance guarantee safe operation in production environments. **Cisco Compatibility:** This transceiver is fully backward compatible with Cisco systems, directly replacing OEM part numbers QSFP-100G-LR4-S and MA-QSFP-100G-LR4, making upgrades seamless without requiring system reconfiguration or costly downtime. **Compliance & Support:** RoHS and ELV compliant, this transceiver meets stringent environmental standards. Custom brand programming is available for OEMs and integrators. Backed by a comprehensive 90-day limited warranty, coupled with free standard shipping on orders exceeding $99, it delivers exceptional value for budget-conscious network architects. **Applications:** Ideal for data center fabric upgrades, campus backbone connectivity, metropolitan area networks, and high-speed interconnects between network facilities requiring 100GB throughput without intermediate regeneration.