DIN EN 14908-2:2006-01

This European standard specifies the control network protocol (CNP) free-topology twisted-pair channel and serves as a companion document to CNP, part 1. The channel supports communication at 78.125 kbps between multiple nodes, each of which consists of a transceiver, a protocol processor, an application processor, a power supply, and application electronics. This standard covers the complete physical layer (OSI Layer 1), including the interface to the Media Access Control (MAC) sub-layer and the interface to the medium. Parameters that are controlled by other layers but control the operation of the physical layer are also specified.