Overview

Cisco 4000 Series Integrated Services Router T1/E1 Voice and WAN Network Interface Modules (NIMs).These flexible interface cards allow for multiple integrated data and voice applications, making it easier to migrate from data-only to packet voice solutions. They also support both T1 and E1, providing additional flexibility for voice and WAN applications simultaneously. The modules include drop-and-insert multiplexing capability, eliminating the need for external third-party channel service units/data service units (CSUs/DSUs) and drop-and-insert multiplexers Please note that these NIMs are not supported with Cisco 2900 and 3900 Integrated Services Routers  For more detailed specifications, you can refer to the official Cisco datasheet.