NM-CEM-4SER Cisco 4 Ports Expansion module

Cisco 4 Ports Expansion module. The Cisco 4 Ports Expansion module is a network module designed for the Cisco 2800, 3800, 2900, and 3900 series routers. It provides four additional serial ports for connecting to a variety of devices and applications. The expansion module provides four additional serial ports for connecting to a wide range of devices, including modems, terminals, and other serial devices. The module supports asynchronous communication at speeds of up to 115.2 kbps, providing reliable and flexible connectivity options.