The Agere Systems KB5817 D-1156#/A1A Modem Card 5187-5216 is a PC Card (PCMCIA) Type II modem designed for use with Ethernet (RJ-45) external interfaces. It offers a single port for connectivity and has a maximum data rate of 100 Mbps. This modem card is compatible with PCI internal interfaces, making it suitable for integration into a variety of systems. With the Agere brand reputation and reliable performance, this modem card is a reliable choice for those in need of high-speed, efficient communication capabilities.