Intercom entrance guard system based on public telephone network
A technology of public telephone network and intercom door, applied in CCTV system, two-way working system, etc., can solve the problems of high cost, large renovation cost, high cost, etc., and achieve the effect of low cost
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[0023] Such as figure 1 A schematic diagram of the intercom access control system based on the public telephone network 5 of the present invention is shown. The intercom access control system based on the public telephone network 5 of the present invention includes: a unit door host 1 and indoor extensions; wherein, each building unit is provided with a unit door host 1 and a plurality of indoor extensions 2, and the indoor extensions 2 have multiple A security alarm interface 4, the indoor extension 2 sends alarm signals from the plurality of security alarm interfaces 4 to the owner's communication tool 6 based on the public telephone network 5. The public telephone network 5 (Public Switched Telephone Network), often referred to as the public network, is a global voice communication circuit switching network, including commercial and government-owned. The public telephone network 5 is a circuit-switching network based on analog technology. Among many wide area network inter...
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