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. 
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      Applications 
            Features 
            Specifications 
            - Power: 120V AC/13.8V AC 1.25A UL listed adapter provided  
- Dimensions: 127mm x 127mm x 38mm (5™ x 5™ x 1.5™)  
- Shipping Weight: 0.9 Kg (2 lbs)  
- Environmental: 0™C to 32™C (32™F to 90™F) with 5% to 95% non-condensing humidity  
- Talk Battery Voltage: 32VDC  
- Connections: (5) RJ-11 modular jacks