发明名称 |
Security system with two signal reporting |
摘要 |
A security system having two distinct channels of communication and which uses a single communication device provides improved security. The system monitors a host of security alarm panels connected to a telephone system. A status signal is communicated between each control panel and a scanner placed at a switching station of the telephone system to confirm the integrity of the communication channel. An alarm event continues to be reported to a monitoring station using the telephone system in the normal manner.
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申请公布号 |
US5956388(A) |
申请公布日期 |
1999.09.21 |
申请号 |
US19970838012 |
申请日期 |
1997.04.22 |
申请人 |
DIGITAL SECURITY CONTROLS LTD. |
发明人 |
PARKER, JAMES;PILDNER, REINHART K. |
分类号 |
H04M11/04;(IPC1-7):H04M11/04 |
主分类号 |
H04M11/04 |
代理机构 |
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代理人 |
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主权项 |
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地址 |
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