Design of the Weak Current System of the Marriott Hotel in Shanghai

To measure the modernization standard of urban buildings, the design form and intelligence of buildings are two main aspects. The Weak Current System of Intelligent Building mainly consists of the following systems:

(1) communication network system;
(2) Office Automation System;
(3) construction equipment monitoring system;
(4) automatic fire alarm and linkage control system;
(5) Public security defense system;
(6) Structured Cabling System;
(7) Weak Current Power Supply and grounding system.

The starting point of the design of smart building weak current project should be based on the building and various functional systems should be configured to provide people with a reasonable, efficient, comfortable and convenient environment space for investment, to meet the needs of modern buildings. From the specific design, we should proceed from the actual nature of the smart building and fully consider the various functional requirements of the owners and users, so that the design can be modernized as far as possible in the overall structure, and the technology is advanced and practical, it is economical and reasonable, and the compatibility and scalability of intelligent building systems must be considered.

Located in Hongqiao New District, Shanghai Marriott Hotel is a five-star hotel integrating hotels, exhibition halls, and office. It covers an area of more than 22 thousand square meters and a construction area of more than 40 thousand square meters. The hotel features 8 floors high and 2 floors underground. The entire hotel consists of three parts: A, B, and C. The AB section of the hotel is the lobby and room layer, and the C section is the exhibition hall and office building.

The following are some systems of the Weak Current Project of Shanghai Marriott Hotel: public broadcasting and calling system in the communication network system, shared antenna TV system, internal wireless paging system, and telephone communication system; automatic fire alarm and linkage control system; closed-circuit television surveillance system, anti-theft alarm system and Garage Management System in Public Security Defense System; structured wiring system and weak current power supply and grounding system to talk about its design.

1 public broadcasting and paging system

The hotel broadcasting and calling system is divided into two categories. One is a public system for public areas (such as the lobby Exhibition Hall and the front-end service area of the hotel). Background Music is broadcast at ordinary times, in case of fire or emergency, it can be switched to emergency broadcast, the second is the Broadcast System for office conference areas and garage areas (professional broadcast equipment should be set up separately in some special areas and large banquet rooms ).

The design of the Public Broadcasting paging system mainly takes into account the following factors: system mode (generally selected press type), divide the broadcast partition, determine the speaker and Amplifier Based on the speaker characteristics, and switch the Emergency Broadcast Function, broadcast lines and stair modes.

The Broadcasting System of the Marriott Hotel is divided into four logical partitions (namely, the hotel, exhibition hall, garage and office building). The broadcast system corresponds to 19 sub-partitions for Emergency Broadcasting and 19 sub-partitions for internal calls, the principle of determining the Speaker and the amplifier is to consider the broadcast effect of the speaker and determine the amplifier based on its power, marriott hotel uses 6 W ceiling speakers with good shape, frequency response and sound pressure indicators in the front-end service area and office building area, 10 W horn speakers in the garage, and 20 W voice control in the exhibition hall.

The public broadcasting system should have two main functions: background music, normal broadcast, and emergency broadcast. The total controller of the emergency broadcast has the highest logical priority. When a fire control trigger signal arrives at the Marriott Hotel emergency broadcast controller, It switches the corresponding load loop to the corresponding emergency broadcast loop by starting the logic control module of each partition. In normal times, when there is no fire signal, each partition operates independently and switches the corresponding loop to a normal broadcast loop. When there is no normal broadcast control signal, it is in the background music or room audio status.

2. shared wireless TV system CATV and Satellite Receiving System

The shared wireless television system of smart buildings is part of the functional requirements for people to use. It is not only used to receive broadcast television, but also to transmit self-sent programs and FM broadcasts.

As a CATV System Design for smart buildings, the system ensures the user level, solves the problem of low-intensity viewing, and ensures the transmission quality of images and program sources. CATV is the main part of the system's front-end device. Its Signal Processing quality directly affects the quality of the entire system. Therefore, the front-end system output should have a high quality to meet the level required by the distribution system.

The front-end devices of the Marriott Hotel are amplified and mixed. The transmission system adopts the distribution-branch method to adapt to the characteristics of the large number of hotel user terminals and irregular distribution. The transmission bandwidth of the hotel system is (5 ~ 860 MHz) provides a total of 40 TV programs and a transmission system covering 530 TV user terminals.

The installation and debugging of satellite receiving system site selection is an important part. After receiving, demodulation, and modulation, satellite signals are mixed into the front-end of the shared wireless TV system, the transmission and distribution system sends data to various user terminals. Marriott hotel uses a board Satellite TV receiving antenna, which is used to receive 10 TV signals from different TV satellites.

Marriott hotel has a VOD service system, which serves as the reception desk for program control and signal service, it can be used as backend management to record information, query charges, add and modify programs, and provide information services.

3. Internal Wireless Paging System

In the signal management part of smart buildings, advanced paging systems are very important. The wireless paging system of Marriott Hotel is designed with micro-cellular paging technology. The micro-cellular paging system is a dedicated paging network that uses cell technology to achieve a fixed field strength. It is a one-way communication system for internal use within the building. The system consists of a wireless paging control center, a micro-cell transmitting unit, a data transmission line, and a paging receiver.

The paging Control Center is located on the underground floor of the hotel. It is connected to the hotel's programmable telephone switch to enable the switch extension paging or manual keyboard paging. The paging signal is sent to the cellular transmitting unit on each floor through a line, so that the receiver within the coverage of the field strength receives the paging signal.

For the design of the paging system of smart buildings, there are usually two problems. The first is the interference of internal signals on external building signals, and the second is the "blind zone" of paging within the building ". The wireless micro-cell is used to control the coverage of the field strength to 10 ~ Within 50 m, the residential network technology is used to construct a paging system with limited space strength in the three-dimensional space of the hotel. In addition, the design can also form any form of wireless communication system through the arrangement of micro-cells, through the adjustment of the transmit unit power (10 ~ 100 mW) can make the wireless field strength distributed within the limited range of hotel space, this is a "single-point" wireless paging system power, not suitable for adjustment, the launch distance is far, there are many differences in the characteristics that are easy to interfere with the outside world.

In smart buildings, due to the inherent shielding effect of building materials (reinforced concrete structures, the paging signal level cannot be connected after penetration loss to form a "Blind Zone" or the signal is weak to form a "weak zone" (the transmitting unit should be added and the position of the transmitting unit should be adjusted to reach the required field strength ).

4. Telephone Communication System

The telephone communication system of Marriott Hotel consists of exchange devices, transmission systems, and terminal devices. The hotel uses 1200 Programmable switch devices, and the telephone station has powerful functions. The digital Programmable switch can implement functions of many services, such as system functions, traffic functions, and user extension functions, according to different hotel needs, in addition, the selection function is also available (including wireless paging, that is, using a switch to connect to the paging host for paging, as well as hotel management, such as registration and checkout, traffic billing, STATUS input, Bill printing, card reading, and so on ).

The telephone data center of the hotel is located on the ground floor, including the transmission equipment room, switch room, and telephone room.

The hotel's telephone line wiring method adopts a separate method, which features a small fault range, simple repair, expansion and transformation, and uses a radial layout for telephone cabling on each floor. The hotel telephone lines use three categories and four pairs of twisted pair wires, and the telephone terminal uses the plug-in. This not only ensures high quality of calls, but also meets the needs of dial-up Internet access.

We recommend that you keep the remaining balance in the selection of telephone distribution boxes for future expansion.

5 fire alarm and linkage control system

The Intelligent Fire Control System of Marriott Hotel is a complete fire safety and alarm system. It has four subsystems: fire detection system, central control system, fire alarm system, and fire-fighting linkage system. See.

The central control system is located in the fire center on the first floor of the hotel. It consists of three sets of Intelligent Fire Control disks. Each Intelligent Fire Control Board has 10 monitoring circuits, each of which can contain 99 intelligent probes and 99 monitoring modules. The 3 control panels actually control 28 circuits with more than 2700 probe points and modules (including office buildings ). The intelligent fire control system monitors all modules of the system through the central processing unit, and reports the fault information. The programmable memory contains the "Incident Control Program ", once the system detects the fire signal, it can automatically execute the program and notify all personnel in the hotel through the fire alarm system. The system determines the alarm signal. The system can set the sensitivity of the smoke sensor to the day/night sensitivity conversion mode based on different occasions in the hotel.

As the eyes of the fire control system, fire detectors distribute all protected parts of the hotel. A site-based smoke probe is set in the front-end service area and room layer; a smoke probe is set in the background management area; and a temperature probe is set in the kitchen and garage; set up a gas detector in the gas table room. A reliable fire detection system is composed of a programmable smart probe, manual alarm, and control module.

The hotel's fire alarm system consists of a Regional alarm display disk, alarm bells, sound and light alarms, and control modules. The fire suppression linkage system of the hotel includes:

(1) Monitor and start the sprinkler pump and the steady pressure pump for the Water Flow Indication of the sprinkler system and the pressure toggle in each layer.

(2) fire hydrant directly starts the fire pump.

(3) Monitoring of fire shutter doors, exhaust fans and pressurized fans.

(4) monitoring of air conditioning systems and other system control.

6 closed-circuit television surveillance system

With the increasingly sophisticated public security management facilities of modern technology, providing comfort and security to hotels is the starting point of design.

The Marriott hotel closed-circuit television surveillance system consists of camera detection devices, image transmission and control devices, and image processing and display devices.

7. anti-theft alarm system

Infrared or microwave signal detectors are used to protect important places such as hotel valuables and financial accounting rooms, and door magnetic alarm protection is set for some hotels. The above alarm signals are sent to the security center in Wired form. This is an important technical measure for hotel technical defense.

8. Vehicle Import and Export Management System

In modern buildings, integrated management of garages is becoming more and more important. The hotel's underground 2-storey garage provides a comprehensive management system for its underground garage, including IC card hosts, electric railings, vehicle controllers, and dynamic computer monitors.

9 Structured Cabling System

As the basis of smart buildings, Structured Cabling is a new concept of cabling system that serves all communication and computer equipment in buildings and meets current and future cabling requirements.

The design should be based on the current and planned needs of smart buildings. At the Marriott Hotel, the design did not classify telephone communication into structured cabling, because as a hotel, the boundaries between voice and data terminals are obvious and the location is not easy to change. In addition, in terms of technical economy, three types of lines with a bandwidth of 16 MHz can transmit low-speed data of 10 Mbps and below, which is a cheap and effective medium for language transmission.

The structured cabling of the Marriott Hotel is structured cabling of the computer management system. The hotel's computer management system is divided into the administrative LAN system and the cash register system (POS ). The front-end and backend of Marriott Hotel have more than 500 terminal information points. information terminals of the Administrative LAN are distributed in the office area on the ground floor and the administrative management area on the back-end of the hotel on the third floor, the information terminals of the cash register system are distributed in the front-end service area on the first to third floors of the hotel.

The hotel Structured Cabling consists of four subsystems:

9.1 workspace Subsystem

The distribution boxes on each floor are used to connect to various information terminals on each floor. It consists of 5 categories and 4 pairs of twisted pair wires and RJ45 terminal sockets. This part has the characteristics of anti-interference, reliability and flexibility.

9.2 trunk Subsystem

Multi-mode optical fiber cables are used to connect the hotel computer room to the distribution boxes of each layer (that is, the total distribution frame is connected to the distribution frame of each layer ). The transmission speed of multi-mode optical fiber cables can reach more than Mbps, with sufficient bandwidth, leaving enough room for future development of the wiring system.

9.3 Management Subsystem

It is composed of distribution boxes of various layers. The front-end service and back-end management area of the hotel are large, the number of information terminals is widely distributed, and the total computer room is located on the first floor. Considering that the maximum distance between the distribution box information terminals on each floor is no more than 100 m, therefore, a distribution box is set up in the front-end service and backend management areas of each building (the cables, twisted pair wires, adapters, hubs, and twisted pair wires are installed in the box)

9.4 inter-device Subsystem

It consists of devices and trunk lines in the computer room.

10 Weak Current Power Supply and Grounding System

The Weak Current Power Supply System of smart buildings must be reliable, stable, and non-interfering. Among them, computer and external equipment, fire alarm equipment and communication equipment belong to the first-class electrical equipment load, using double power supply end self-cut power supply. Configure a separate UPS device for the terminal computer device.

In the weak current project of Marriott Hotel, the power supply of the automatic fire alarm system, computer administrative LAN and cash register system is self-switched with dual power supply ends. The power supply of the dual-power switch cabinet comes from the supply of two transformer low-voltage circuits and one diesel generator in the hotel's power distribution room.

Each system of the hotel's weak current project has an independent power distribution box control.

The grounding of the weak current system is an important part of the Weak Current System.

In order to reduce interference and protection equipment, the weak current grounding system must be grounded independently. In the Weak Current Grounding System of Marriott Hotel, copper core wires larger than 25mm2 are used to connect with the outdoor grounding pile.

11 Conclusion

The smart building weak current project involves a wide range of technical aspects, and the design should have a comprehensive perspective.

With the development of new and high technologies in modern society, the demand for Weak Current Engineering, Computer control communication, and automatic equipment management technology of Intelligent Buildings is also increasing. This requires that new technologies be continuously mastered and the design be improved.

Creating smart buildings with reasonable investment and comfortable environment is urgently needed.