The JBX01124 400GBASE-PLR4 QSFP-DD Transceiver represents the latest advancement in high-speed optical networking technology, specifically engineered to meet the demanding requirements of modern data centers and enterprise networks. As a drop-in replacement for Cisco's QDD-4X100G-LR-S module, this transceiver delivers exceptional performance and reliability for organizations seeking to maximize their network infrastructure investments. **Performance Specifications:** Operating at 400 gigabits per second, this module utilizes advanced 4x100G parallel transmission architecture, maintaining signal integrity over 10-kilometer distances through single-mode fiber (SMF). The 1310nm wavelength is optimized for long-distance transmission, while the 9/125µm fiber core ensures compatibility with standard industry infrastructure. **Connectivity & Integration:** Equipped with MTP/MPO-12/APC connectors, the transceiver provides flexible deployment options for diverse network topologies. Full compliance with IEEE 802.3bs standards and QSFP-DD MSA specifications guarantees interoperability with existing enterprise equipment. The Cisco-compatible design eliminates integration complexities and reduces deployment timelines. **Quality & Safety:** Manufactured with precision-engineered metal housing and advanced laser transmission technology, this transceiver meets rigorous international safety standards including Class 1 Laser certification, TUV, UL, and FDA 21CFR 1040.10 compliance. RoHS and ELV directives ensure environmental responsibility without compromising performance. **Operational Reliability:** The module operates seamlessly across 0-70°C temperature ranges, accommodating diverse data center environments from standard cooling to high-density deployments. The compact 5x4x2 form factor minimizes rack space while the robust design ensures long service life. **Business Value:** With custom brand programming available, organizations can maintain consistent branding across their infrastructure. The 90-day warranty provides peace of mind, while free standard shipping (orders $99+) reduces procurement costs. Whether upgrading legacy systems or building new high-capacity networks, this transceiver delivers professional-grade performance at competitive pricing. **Applications:** Ideal for data center interconnects, metropolitan area networks (MAN), campus backbone connections, and high-bandwidth video delivery systems requiring reliability and longevity.