Digital multipoint distribution system
(1) Introduction of digital multi-point distribution system
The digital multi-point distribution system combines the technical characteristics of 2G, 3G and WLAN networks to maximize the common access of multiple network systems. At the same time, optical fiber or Category 5 cable is used as the channel transmission medium for wireless signal distribution transmission. The entire system consists of multi-mode Source access unit (MSA), expansion unit (EU) and remote unit (RU) to achieve. The digital multi-point distribution system can effectively solve the problems of mutual signal interference and large transmission loss, support the needs of mobile communication networks with multi-standard and multi-service access, and can reduce the cost and complexity of the system and facilitate subsequent system maintenance work.
EU is optional in the digital multi-point distribution system. When there is no EU, the MSA can be directly connected to the RU. Its operating principle is: In the downlink signal link, MSA is the access unit, which mainly digitally processes the radio frequency signal from the base station, converts it into an optical signal, and transmits it to the EU and then to the RU through the optical cable / category 5 cable. The RU unit restores the signal to a radio frequency signal and then amplifies it and outputs it to the coverage area; in the uplink signal link, the RU digitally converts the radio frequency signal from users in the coverage area into an optical signal and transmits it to the five types of wires / optical cables to From EU to MSA, after the MSA unit restores the signal to a radio frequency signal, the output is amplified and sent back to the base station. Its operating principle is shown in the following figure:
Digital multi-point distribution system working principle diagram
The digital multipoint distribution system can not only provide transmission and coverage services for 2G and 3G mobile communication networks, but also realize WLAN transmission and coverage to meet the high-speed wireless data transmission needs of operators.
(2) Application scenarios and solutions of digital multi-point distribution system
Compared with the traditional coaxial cable indoor distribution and coverage system, the digital multi-point distribution system has unparalleled advantages. The application scenarios include districts, office buildings, urban villages, hospitals, airports, stations, schools, venues and other areas.
(1) Residential area coverage solution
Demand characteristics: The building construction of the community is more scattered, the network coverage environment is complex, the signal amplitude is fluctuating, and the owner has higher requirements for the environmental aesthetics.
The solution of adopting digital multi-point distribution system: select the central building of the community, and centrally set the source base station and access unit in the central building, which can avoid the construction of multiple computer rooms, avoid the waste of construction investment, and place the remote unit in the In different buildings, optical fibers or Category 5 cables are used to connect to the access unit. The optical fiber can avoid interference with other signals. The remote unit uses a CATV thin coaxial cable to connect the antenna. The access unit can be dynamically adjusted, the antenna signal strength of the cell is easily adjusted, the network management monitoring capability is accurate, and the network resources can be used flexibly and effectively. The digital multi-point distribution system has the advantages of small and compact equipment, thin and soft cables, convenient layout, easy to beautify the environment, and meet the requirements of the owner.
(2) Elevator coverage solution
Demand characteristics: The signal changes with the up and down movement of the elevator, which requires high signal strength.
The solution of digital multi-point distribution system: The equipment of digital multi-point distribution system is small. Place the remote unit on the top of the elevator car to ensure that the signal coverage in the car is uniform and does not change with the elevator moving up and down, and is relatively soft The cable is connected to the access unit, the cable is bundled with the cable of the elevator, and can be moved simultaneously with the car.
(3) Venue coverage solution
Demand characteristics: The signal coverage area of ​​general venues is large, the capacity requirements between busy and idle hours are huge, the peak capacity requirements are large, the signals of different standards are required to cover together, and the later maintenance is strict.
The solution of adopting digital multi-point distribution system: According to the demand characteristics of the venue, choose a computer room to centrally place the source base station and access unit, which can save the number of computer rooms and reduce investment. Using optical fiber to connect the relay unit and the remote unit placed in each coverage area, optical fiber transmission can avoid mutual interference of signal transmission. Through the regulation of the access unit in the computer room, the capacity adjustment in the coverage area can be achieved. Digital multi-point distribution system has simple system design, convenient installation, perfect network management monitoring system, and little impact on the aesthetics of the environment.
(4) Hospital coverage solution
Demand characteristics: Hospital buildings are scattered, and due to the high requirements for electromagnetic radiation interference in hospital operating rooms and electronic medical equipment, special consideration is required to solve the problem of electromagnetic radiation interference.
The solution of digital multi-point distribution system: choose the building in the center of the hospital, set the source base station and access unit in the building, set up the low-power signal source, and use the optical fiber transmission connection to place it in the far end of other buildings For the unit, the remote unit uses a CATV thin coaxial cable to connect and distribute the coverage antenna nearby. The antenna is arranged with the principle of multiple antennas and low power, so that the user end reduces the transmission power and reduces the electromagnetic radiation. For areas with strict requirements on the electromagnetic environment, such as the operating room, remote units are set independently, and the signal strength is adjusted or the signal coverage is turned off through the monitoring system of the digital multi-point distribution system under special circumstances such as operation. The digital multi-point distribution system is easy to install, easy to set up, easy to wire, and has little interference to the electromagnetic environment of the hospital.
(5) Network upgrade solution
Demand characteristics: Due to the higher frequency band of 3G signal, the upgrade from 2G to 3G system requires little impact on the original network, and solves the problem of difference in transmission loss of different network signal distribution coverage and the output of different network source base stations Power matching problem.
Digital multi-point distribution system solution: the digital multi-point distribution system only creates a new source transmission backbone route, which has low requirements for the source (power source input), which is easy to achieve power matching of the source; digital multi-point distribution system has Parallel multi-channel low-power output, it is also very easy to find the power matching point in the different layer with the original network distribution and coverage system, and simply adopting a combination circuit at this power matching point can realize the network transformation. The digital multi-point distribution system is simple in design, fast and convenient to install, easy to wire and beautiful, and easy to open and debug.
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