A Core Netzwerk BTS module in Nokia's BTS systems is responsible for core network connectivity and functions, such as routing, switching, and processing of data and signaling traffic. It acts as a bridge between the base station and the core network, ensuring seamless communication and transport of voice, data, and control information. Nokia CCP18-A C109093A Core Netzwerk BTS Base Transceiver Station module. It's a specific version or variant that is not widely documented. Nokia uses a variety of modules and equipment in their core network and BTS solutions, and their specific model numbers and descriptions can vary.