The COM-2 Communications Card plugs into the ITC-2001 Intelligent Transmission Cabinet Motherboard, DAB-7 Distributed Addressable Motherboard or CAM-2700 Central Audio Motherboard. When installed in the ITC-2001 Motherboard or the DAB-7 Motherboard, the COM-2 communicates with all installed option cards. The COM-2 broadcast status changes (Alarms & Troubles) from any option card onto the network so other nodes can act upon the information if required. The COM-2 uses Echelon® LonTalk® Communications to communicate to other nodes in the system.