| 摘要 |
PROBLEM TO BE SOLVED: To provide a monitoring/calling system used for an apartment house and allowing a reduction in the number of using paired lines when new construction is performed, and using the existing paired lines, as they are, when a renewal is performed. SOLUTION: A call voice and control data are transmitted and received between an intercom device 3 in a lobby and the house information board 1 of each dwelling unit or an alarm monitoring board 2 in a building manager office. The speech voice and control data are used as packet communication data and are transmitted or received, with multiplex transmission through the paired lines L2. COPYRIGHT: (C)2005,JPO&NCIPI
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