Mannings weak engineering, sales ranking first

Mannings weak engineering, ranking first sales professional to undertake the installation weak engineering, quality, quality assurance, reliable electric power applications in accordance with the strength of power transmission power can be divided into strong and weak electrical categories. Building and buildings generally refers to the exchange of electricity and more than 220V50Hz strong power. Mainly to provide people with electrical energy, the energy is converted to other energy sources, such as air-conditioning electricity, lighting, electricity, electric power and so on. System features commonly used building weak system are the following: (1) Telephone communication systems for telephony (including Group 3 facsimile, video telephony, etc.) communication function; a star topology; use three (or more) unshielded frequency twisted pair transmission signal within the audible range. (2) Computer LAN System is a network-based office automation and a variety of data transmission; the star topology; use of five (or more) of unshielded twisted pair, digital signal transmission, the transmission rate of up to 100 Mb / s or more . (3) Music / broadcast system installed in the field (such as shopping malls, railway stations, restaurants, rooms, corridors, etc.) speaker, play music, and through the microphone on the scene broadcast; multiplexed bus structure; transmission by the power amplifier output The constant pressure (eg 120 V / 120 Ω) audio signal to drive the scene speaker sound, transmission line using insulated copper wire. (4) cable television distribution system will evenly distribute cable television signals to each user points inside the building; the use of the splitter, distributor for signal distribution, in order to reduce signal distortion and attenuation, so that all the user points the signal quality to meet specification requirements its different wiring as a tree structure, and with the form and distribution of building user point varies; use 75 Ω RF coaxial cable, transmission of multiple RF signals. (5) The security monitoring system installed in the field of cameras, detectors and other security equipment at the entrances to the building and some of the important sites for monitoring and alarm and other anomalies; transmission of video signals using the star structure, the use of video coaxial cable; control transmission signal bus structure, the use of insulated copper cables. (6) Fire Alarm System This system alarm and fire linkage system composed of three parts, fire radio systems, intercom systems, fire alarm from the fire. Fire alarm and fire linkage system by setting fire detectors, manual alarm system throughout the building and other on-site to monitor the situation, when there is an alarm signal, based on the received signal, according to pre-set program, the appropriate linkage equipment to control the fire from spreading, the signal transmission using multiple bus architecture, but for the important fire-fighting equipment (such as fire pumps, spray pumps, positive pressure fans, exhaust fans, etc.) transmission linkage control signal, sometimes with a star structure, a transmission signal using insulated copper cable (some products require the use of twisted-pair). Fire radio system for command in the event of fire safety evacuation site personnel, the use of multiple bus architecture, signal transmission using insulated copper wire (the system can be combined with music / Broadcast System). Fire intercom system for directing field work firefighters put out the fire using two kinds of star and bus structures, signal transmission using shielded cable. (7) The access control system using a computer, smart card locks, card readers and other equipment, to be set up at the entrances to the state, monitoring, control and recording, to achieve unified management of the entrances to the building, to ensure building safety, its topology and Transmission media varies by product. (8) parking fees management system installed in entrances and exits out of the ground under the induction coil, the induction of the vehicle, through artificial / semi-automatic / automatic charging management system, billing and control electric fence hoist and so on. The system wiring is limited to the entrance to the building yard, each entrance by a controller, the controller can work independently, but also with the upper management of computer networking, the wiring structure, and transmission media varies by product. (9) building automation systems connected to the controller via the site and perform a variety of detection devices inside and outside the building of various environmental parameters and building a variety of devices (such as air conditioning, plumbing, lighting, power supply and distribution, elevators and other equipment ) operating state detection, monitoring and control, and to connect the site controller via computer networks, resources and equipment for building rational allocation and management, to achieve a comfortable, convenient, saving, reliable purposes. So far, the building automation system is not yet an international standard, different manufacturers used different communication protocol, which is different fieldbus and control bus topologies and transmission media. The following will now be widely accepted and adopted by the international community LonWorks technology and BACnet technologies for a brief introduction. In addition, video conferencing systems, display systems, PA systems, patrol system, building intercom system, three table (water, electricity, gas) automatic meter reading systems. Weak systems of buildings of different functions to be set vary. [Contact: 13976640562 Miss Zhang Company Name: Hainan Liansheng Science and Technology Development Co., Ltd. Address: Room pretty good Hainan Haikou Meilan District Building, 707 diligent way