Security through the development of the 2008 Beijing case found that all TCP / IP technology, semi-digital video door bell products are quite common. Many manufacturers of analog and digital combination of eye-catching semi-digital products, and some manufacturers have introduced a fully digital intercom products have become the development of the 2008 Beijing Security intercom series of outstanding highlight shows, digital products has become on the intercom stresses the importance of indicators of technology development manufacturers.
If the number of homes Matsumoto Smart 880 series is the all IP network transmission of digital building intercom system, door from the room extension to the machine, to the management center (PC) are using TCP / IP data transmission, IP-based networks due to network architecture, network communication with the fastest speed and call features a full range of all households, also have a very powerful system extensions.
This stage, despite the traditional analog intercom systems still account for a large market share, but its shortcomings are increasingly prominent.For example in the wiring structure, the model would signal transmission network is divided into main bus (network) and the branch bus (unit). Device from the management machine, cell door machine, door machine unit, the second confirmed tenants door machine, indoor extension form from the top-down hierarchical bus architecture. Management plane to the cell door machine, door machine is a residential unit trunk bus network, and the second unit to confirm residents door to door machine machine, indoor extension is the second branch of the bus. Both the main branch of the bus or bus, voice, video and control signal lines are required for the laying of a separate dedicated cable, the cable type and quantity will be greater, which gave the system cost and engineering trouble.
Now, half-way digital network approach has been more common, the TCP / IP networking to the cell door machine, door machine unit to the door machine and indoor household use a conventional bus mode. It is understood, the reason is that TCP / IP networking in the wiring, networking, signal transmission, system scalability, feature extensibility, system maintainability, network interference, multi-channel communication capability, etc., is very evident in advantage.
Then compare digital TCP / IP doorbell intercom system, wiring is much smaller and simpler, various signals (audio and video, control) all integrated together in just a digital cable transmission, simplifying the wiring, the installation of the system equipment , commissioning, maintenance is simple.TCP / IP network can not only achieve the sound, image, control signal transmission, but also realized the block of flats, residential intercom equipment all the network. Technology for system and network-based digital system can be used integrated audio and video codec module, ARM platform, its powerful data processing capabilities and hundreds of megabytes of bandwidth makes the original more than a single type of signal into digital signal so that signal transmission change too "simple", the signal quality significantly improved greatly improve anti-interference ability, and can achieve with the cell perimeter alarms, access control, card, and community services system for seamless integration.
Bus system with the traditional analog intercom than IP numbers highlight the feel intercom has the following characteristics: transmission distance without any geographic restriction, extension very easy to upgrade; transmission of audio and video, control signal bus is much better than the traditional way ; allows home alarm, home appliance control, remote monitoring, community service and other functions integrated; installation convenience, reducing the project cycle, saving for the project.
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