The 747698-B21-ST is a HP 747698-B21 compatible fiber transceiver module that has been designed, programmed & tested to work with HP brand switches & routers. It delivers dependable 40 Gb E connectivity over fiber cable, for 40 G Base-SR4 compliant networks, with a maximum distance of up to 400 m (1312 ft.). This QSFP+ fiber module is hot-swappable, making upgrades & replacements seamless by minimizing network disruptions. Star Tech.com offers a wide variety of QSFP+ modules & direct-attach QSFP+ cables, providing the convenience & reliability you need to ensure dependable network performance.