ISO/IEC 14908-4:20 11规定了使用隧道机制在互联网协议(IP)网络上传输用于商业局域网的控制网络协议(CNP)分组，其中CNP分组被封装在IP分组内。它适用于CNP节点和CNP路由器。ISO/IEC 14908-4:20 11的目的是确保希望使用IP网络来使用CNP进行通信的各种CNP设备之间的互操作性。

ISO/IEC 14908-4:2011 specifies the transporting of the Control Network Protocol (CNP) packets for commercial local area control networks over Internet Protocol (IP) networks using a tunnelling mechanism wherein the CNP packets are encapsulated within IP packets. It applies to both CNP nodes and CNP routers.

The purpose of ISO/IEC 14908-4:2011 is to ensure interoperability between various CNP devices that wish to use IP networks to communicate using the CNP.