The IBM 91H0397 is a PCI (Peripheral Component Interconnect) adapter card designed to enable 10/100 Mbps Ethernet connectivity for desktops and servers. This adapter is built to facilitate fast and reliable network connections, supporting both 10 Mbps Ethernet for traditional network environments and 100 Mbps Fast Ethernet for high-speed networking needs. The card features a standard RJ-45 connector, making it compatible with a wide range of network cables and ensuring easy integration into existing network infrastructures. Engineered with IBM's expertise in networking solutions, this adapter card provides secure and stable connections, enhancing data transfer rates and network efficiency. It is ideal for small to medium-sized businesses and home offices that require improved network performance for applications such as file sharing, print services, and Internet access. The IBM 91H0397 Ethernet PCI Adapter is characterized by its easy installation, broad compatibility with network operating systems, and reliability, making it a valuable component for upgrading network capabilities.