The JL Audio 25' Powered Network Cable is designed to connect a compatible MediaMaster source unit to a MediaMaster MMR-40 NMEA 2000 Network Controller or a compatible Multi-Function Display (MFD). It simulates an isolated NMEA 2000 network for reliable connectivity. Note: JL Audio Powered Network Cables support a maximum of two NMEA 2000 devices. For systems with additional NMEA 2000 devices, a genuine NMEA 2000 network must be assembled, which does not support JL Audio Powered Network Cables. Connection of MM100s (not MM100s-BE) requires MMC-DN2K-1 or MMC-DN2K-6 to adapt the Deutsch connector on the MM100s to a NMEA 2000 5-pin Micro-C connector. Required for connecting MM100s (non-BE version) via MMC-DN2K adapters 25 feet of durable cable for flexible installation | JL Audio 25' Powered Network Cable f/ Connection of Compatible NMEA 2000 MediaMaster