The Cisco QSFP-H40G-AOC20M Compatible QSFP+ Active Optical Cable is a direct-attach fiber cable with QSFP+ connectors that operates over multi-mode fiber (MMF). It adheres to the SFF-8436 QSFP+ MSA standards, offering a cost-effective alternative to using separate optical transceivers and patch cables. This AOC is ideal for 40Gbps connections within and between adjacent racks and can be used in a wide variety of applications, including high-capacity I/O in Storage Area Networks, Network Attached Storage, and Storage Servers; switched fabric I/O such as ultra-high bandwidth switches and routers; data center cabling infrastructure; and high-density connections between networking equipment.