The basic functions of the video intercom include two-way calling, video calling, door machine supervision, remote unlocking, etc., followed by the development of the enhancement and the user's need for additional functions. Today's intercom system also derives the picture capture storage function and the video message. Function, call recording and video function, household pass function, ladder control function, etc. However, as an ordinary user, it feels a bit difficult to purchase a video intercom opportunity. I don't know which aspects to consider. Let's give a detailed introduction to the Xiaobian China Merchants Network. 1. Imported brands do not have to be better than national products. The planning of residential quarters in China is as small as a few hundred, and there are thousands of households, mainly in buildings. This is unbelievable in Western countries with relatively small population density. Therefore, the capacity of foreign intercom systems is far less than domestic. In fact, if only from the point of view of digital intercom skills and quality, some national product brands have already arrived and even surpassed imported brands, and in some respects have greater advantages than imported brands. Therefore, do not fall into the import brand must be better than the domestic brand misunderstanding. 2. Identify whether it is really a digital product. For the time being, digital video intercom is still in the market, and it is in an accelerated period of development, and it has become an important figure in the digital family. It is necessary to have three major elements: video compression, voice processing, network transmission. All audio and video signals need to be digitally encoded and compressed and transmitted over the network. Therefore, when purchasing products, we must look at whether the product can have RJ45 interface, and see if the intermediate networking equipment can be used. Generally speaking, these networked intermediate devices can be directly purchased from the market. If they can only be purchased from the intercom system supplier, it must not be a true digital product. The real digital product is standardized and universal. . 3, product process description Because the intercom system is now integrated into our days, we will use them every day. Therefore, the personality of the product's craft appearance is necessary to be close to the home personality. In order to give customers a good first impression, it is necessary to have a beautiful appearance in the product of the intercom system. Usually there are strong manufacturers, the products of the same series will have a variety of color styles, structure description styles, the selection of raw materials are also divided into high, medium and low grades, more importantly, the concept of depiction, humanized operation and depiction, will make users feel very attentive. 4, waterproof, tamper, damage The door machine of the intercom system not only needs to be beautiful in appearance, but also needs to use good raw materials. The door machine is facing the damage at any time. Therefore, it is necessary to have the necessary impact resistance to prevent the thief from being damaged. In addition, in terms of product description, it is necessary to have a description of the outstanding tamper-proof, in case the thief and other murderers can easily steal it. In the structural depiction of the product and the appearance of the raw materials, it is necessary to consider the question of waterproofing to avoid affecting the operation of the entire system. 5, the function and integration of the system In addition to functioning as video intercom and remote unlocking, digital video intercom products can also complete long-distance video surveillance, transaction alarm, access control system, three-table copy, information release, smart home control, uploading and video on demand. And even mobile phone linkage and other value-added services. Therefore, in the time of the product demonstration, it is necessary to test whether these functions can be possessed to satisfy the needs of the residential area. To be satisfied with the existing community to carry out planning, therefore, the function of the system needs to be very strong. 6, performance goals and field testing The main function of the digital intercom system is still intercom. Therefore, it is necessary to investigate the sound of the call, and check the performance objectives such as audio signal-to-noise ratio, distortion and frequency response. Together, investigate the board process and test the electrical targets of the product, such as current and voltage power. Anatomy of visual intercom The building visual intercom system usually includes visual intercom and networked alarm intelligence, which can satisfy the different needs of different households, villas, ordinary houses, high-rise buildings and social residential quarters. Nowadays, the planning of the community is more and more. They often have a large area, high floors, many households, many scenes, complicated lines, long distances, and many entrances and exits. The developers pay more attention to the stability and cost of the system. The Shidean2000 system just handled the above questions. The following is a detailed analysis of this system of our company in a certain district of Hangzhou. Exquisite Qiantang is located in the administrative middle area of ​​Binjiang District, covering an area of ​​161 mu, with a total construction area of ​​more than 320,000 square meters. The total number of households is 2,128, and the first phase is 829 households with 14 units, all of which are 18-storey high-rises. 1299 households, 14 units are high-rise buildings with 31 floors or so, requiring a colorful visual intercom access control networking system. System composition: The unit uses the 980 system bus control method. The indoor extension is the latest 5.6-inch ultra-thin 980RY36 series visual extension. Each layer is equipped with a maintainer to make the system more stable. The converter converts the intra-unit bus into a community-connected bus system. The intercom server converts the residential network bus into a TCP/IP signal, and the management is replaced by a multimedia computer. All operations of the administrator are completed on the computer, and the management intermediate computer directly accesses the Ethernet network through the network switch. Both the home line and the trunk line are 6-core plus video, and the network bus is 4-core plus video (in this case, from the converter to the video intercom server); from the video intercom server To the middle is a 4-core single mode fiber. The video intercom system and the access control system share an Ethernet network video intercom server and the access control server share a network switch and a fiber transceiver, and the five types of network lines directly go to the management intermediate total network switch. System features: The cell is probably a rectangle, and the middle of the control is in the center of the whole cell. Therefore, the Ethernet network adopts the parallel method: multiple units use a video intercom server, which is small (180MMX160MMX30MM) and comes with an IP address. The standard RJ45 interface, each visual intercom server is equipped with a network switch, each unit of the access control system is also a traditional 485 plus TCP/IP server method, and the server for the solution of the access control is standardized. The TCP/IP signal and the RJ45 interface, there is no compatibility and the previous doubts about the interference of the access control to each other, the traffic bandwidth is also sufficient. Digital signal transmission, no signal attenuation (no signal expansion required), strong anti-interference ability, should be transmitted at long intervals, up to 100 meters with Category 5 cable, 30KM for optical fiber transmission, shared network for audio and video control, simple network wiring, line High reliability, multiple channels can be transmitted independently, handling busy queries. 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