The IBM 21H7977 Turboways 155 PCI UTP ATM Adapter is a high-speed networking component designed to integrate IBM servers and workstations into Asynchronous Transfer Mode (ATM) networks. Operating over unshielded twisted pair (UTP) cabling, this adapter is specifically engineered for environments requiring fast, reliable communications, such as multimedia applications, complex scientific computations, and large database transactions. With a transfer rate of 155 Mbps, it significantly enhances network performance and efficiency. The 21H7977 supports an array of network protocols, ensuring compatibility with existing systems while providing a scalable path for future expansion. This adapter includes advanced features like hardware-based ATM segmentation and reassembly, traffic management for quality of service (QoS), and support for AAL5 to facilitate efficient packet delivery. Designed to fit into a PCI slot, it offers straightforward integration into a broad range of IBM servers and workstations, providing a cost-effective solution to meet evolving network demands.