Three Line Concentrator. The LC-3 Line Concentrator allows up to three emergency phones to share a single line. A call initiated by any emergency phone is given the line. If a second emergency phone attempts to make a call while another emergency call is in use, the LC-3 will provide a busy signal until the line is available. Viking emergency phones can be programmed to redial on busy. All inbound calls are answered by the LC-3. The emergency personnel then dials a touch tone command to connect to one of three phones. A Fire Floor Phone port is provided as a means for local dedicated telephones to directly connect to any of the three emergency phones. A secondary mode of operation allows two emergency phones to share an existing analog line of a phone system. Applications Sharing one line with three Emergency Phones Where elevator code requires a means for emergency personnel within the building to establish two way voice communication to each car individually Features Automatic answering of inbound calls Inbound calls can be Touch Tone transferred to any port Connects up to 3 emergency phones, or 2 phones can share a line with a phone system Fire Floor Phone port provided to meet elevator code Modular connection for easy installation During power outages, the emergency phones are all connected to the phone line.