The IBM 21H3890 Turboways 155 PCI Adapter is a high-speed network interface card designed to facilitate fast and reliable data communication across ATM (Asynchronous Transfer Mode) networks. With its support for 155 Mbps transfer rates, this adapter is engineered to meet the demands of high-performance computing environments, multimedia applications, and broad-scale corporate data networks. Deployed in PCs and servers equipped with PCI (Peripheral Component Interconnect) slots, the IBM 21H3890 makes it possible for these systems to connect to ATM networks, which were known for their ability to handle various types of traffic, such as voice, video, and data, within a single infrastructure. This allows organizations to consolidate their network resources and improve the efficiency and scalability of their communications infrastructure. The adapter's robust build quality and advanced features ensure compatibility with existing network standards while providing a pathway for integrating newer technologies.