This standard specifies the technical requirements and inspection methods for networked visual intercom systems (hereinafter referred to as systems)、 and is the basic basis for designing、 manufacturing、 and inspecting networked visual intercom systems. This standard applies to networked visual intercom systems. In addition to the requirements for visual functions and video characteristics、 this standard also applies to networked non visual intercom systems. 2 Normative References: The clauses in the following documents become clauses of this standard through reference in this standard. For dated reference documents、 all subsequent amendments (excluding corrected content) or revisions are not applicable to this standard. However、 all parties who have reached agreements based on this standard are encouraged to investigate whether new versions of these documents can be used. For undated references、 the latest version of * applies to this standard. GB/T6996.1 Comprehensive Test Charts for Transmission Television GB/T 6996 12. Transmission Television Gray Scale Test Chart A Type GB12663-2001 General Technical Conditions for Burglar Alarm Controllers GB/T 15279-2002 Technical Conditions for Automatic Phones GB 50348-2004 Technical Specifications for Security and Prevention Engineering GA/T 72-2005 General Technical Conditions for Building Intercom Systems and Electric Control Burglar Doors GA/T 368-2001 Technical Requirements for Intrusion Alarm Systems 3 Terminology and Definitions. The following terms and definitions established in GA/T72-2005 apply to this standard. 3.1 Networked Video Intercom Connected Networks System is a system composed of management machine、 visual doorstep machine、 visual indoor machine、 intermediate transmission control equipment、 system power supply、 etc. It has functions such as call selection、 intercom、 monitoring、 electronic control、 and network management. 3.2 Center management unit is a device that can receive、 manage、 and control calls and/or monitoring、 event information、 etc. from doorstep and indoor devices. 3.3 The video outdoor unit of the visual doorstep machine is installed at the entrance of the population、 and has functions such as selective calling、 intercom、 camera、 and control. 3.4 A device that can be installed in the user's room as an indoor unit and has functions such as calling、 intercom、 monitoring、 and unlocking control. 3.5 A device in the intermediate transfer and control unit system that has functions such as receiving、 relaying、 regenerating、 amplifying、 distributing、 forwarding、 exchanging、 or controlling various signals. 3.6 Audio channel The channel through which audio signals are transmitted. It is divided into main calling channel、 response channel、 and networking channel

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