The Cisco VN 2900 Network Adaptation Interfaces are part of the Cisco VN 2900 Video Networking System-a high-density video encoder and decoder that receives audio and video streams, performs video processing, and adapts the streams to any standards-based digital broadband network.The Cisco PS2042 OC-3c/STM-1 MMF ATM Network Adaptation Interface provides ATM connections for multimode fiber (MMF) networks up to a distance of 1.2 miles (2 km).