The 845398-B21 is a 25Gb SFP28 S 100m Transceiver developed by Hewlett Packard (HP), a leading technology company known for its innovative and reliable networking products. This transceiver module is designed to deliver high-speed, low-latency network connectivity for servers, storage, and networking hardware in data centers and enterprise IT networks. The 845398-B21 supports a data rate of 25 Gbps, providing a significant bandwidth boost for applications requiring high throughput, such as data analytics, high-performance computing, and cloud services. It uses the SFP28 interface, which is an enhanced version of the popular SFP+ configuration, enabling better signal integrity and greater speeds over short distances (up to 100 meters on OM4 multimode fiber). The compact form factor and low power consumption of this transceiver make it an eco-friendly and cost-effective solution for upgrading network infrastructure, ensuring compatibility and straightforward integration into existing systems with SFP28 ports.