NIM-24A= is a 24 Channel Async serial interface for ISR4000 and 8000
The Cisco Asynchronous Serial NIM - 16/24 Port are multi-protocol asynchronous serial network interface modules (NIMs) supported on the Cisco 4000 Series ISRs. This module allows the Cisco 4000 Series ISR platforms to act as a terminal server for out-of-band management of other network and server devices in the network. The feature functionalities are in line with the HWIC-16A module for the ISR-G1 & ISR-G2 series.