Fiber optic FTTH system solution

one Overview of integrated wiring systems

 

1.1 Overview

 

Cabling is a modular, highly flexible information transmission channel within a building or between groups of buildings. It not only enables voice, data, image equipment and information exchange equipment to connect with other information management systems, but also enables these devices to connect with external communication networks. It also includes all cables and associated connecting components between the external distribution network or telecommunication lines of the building and the application system equipment.

 

Cabling consists of different types and specifications of components, including: transmission media, related connection hardware (such as distribution frames, connectors, sockets, plugs, adapters) and electrical protection equipment. These components can be used to build a variety of wiring subsystems, each of which has its own specific purpose and is not only easy to implement installation, but also can be upgraded smoothly as requirements change.

 

Integrated wiring system is the nerve center of information, and its performance directly affects the performance and life of information system

 

Under the premise of meeting the needs, the program focuses on future system expansion, reliability, easy maintenance, easy management and other issues.

 

1.2 Comparison between integrated wiring and traditional wiring

 

In the past, each subsystem in the building was wired independently and used different transmission media, but with the rapid development of communications and computer systems, traditional wiring has not adapted to the needs of communication and computer transmission lines. The specific performance is as follows:

 

※ Poor coordination. The professional design of each subsystem, too many diversities on the route, the pipeline is complicated, and the drawings must be summarized many times to determine a compromise plan.

 

※ Repeated investment. Repetitive construction during wiring causes waste of materials and personnel.

 

※ Poor compatibility Each subsystem is independent of each other and incompatible with each other, causing inconvenience in line management and maintenance.

 

※ Poor openness and flexibility. The movement and change of the device will cause the system to change.

 

※ Poor practicality. The end user cannot change the original wiring to suit their own needs.

 

※ Poor scalability. When new requirements or new systems are difficult to meet on the original wiring, they need to be rewired, so they need to be reinvested, and repeated wiring damages the decoration and aesthetics of the building.

 

The use of integrated wiring system, can overcome the shortcomings of the above traditional wiring, all voice, data, video and monitoring equipment wiring combined in a set of standard wiring system, it has many advantages:

 

※ Fully adapt to the development of communication and computer network in 15-20 years, laying a solid line foundation for comprehensive office automation in the future.

 

※ With openness and full flexibility, no matter how each subsystem equipment changes, how the position moves, the wiring system does not need to change.

 

※ Improve the performance/price ratio of the whole system.

 

※ The design idea is simple, the construction is simple, the construction cost is reduced.

 

※ Maintenance is convenient and unified, greatly reducing the number and cost of maintenance management personnel.

 

※ Good practicality, can be changed and adjusted at any time according to the different needs of end users.

 

In addition, the integrated wiring system also has the following characteristics:

 

※ Cost saving. The advantage of the integrated cabling system is that it represents a single, measurable cost, so that users can easily make cost estimates according to its standardized structure.

 

※ Suitable for use in various environments. The characteristic of the integrated wiring system is that it can transmit a variety of different frequencies of communication signals, weak current, and provide a suitable operating environment for different system manufacturers, so that different weak current signals can be transmitted unimpeded in the wiring system. The routing of various signals can be adjusted arbitrarily through its management subsystem.

 

※ Open system design. The wiring system can provide a completely open environment for various transmission systems on the market at present, and the standards used are all international common standards, and there is no incompatibility.

 

※ Future security. In addition to providing users with long-term quality assurance of cabling products, the integrated cabling system is more important to ensure that the system is not only open to all existing communication systems, but also to ensure that it meets the needs of future new systems without replacing the cabling system.

 

1.3 Structure of integrated wiring system

 

Integrated cabling system adopts star topology structure and hierarchical star topology structure, according to the structured cabling system standard formulated by the International Electronics Industry Association (EIA) and the International Telecommunication Industry Association (TIA) in 2002, GB50311-2007 "Integrated Cabling System Engineering Design Code" formulated by the Ministry of Construction of the People's Republic of China in 2007, Structured cabling system is composed of working area subsystem, wiring (horizontal) subsystem, trunk (vertical) subsystem, equipment subsystem, management subsystem and building group subsystem. See the image below:

Basic structure of integrated wiring system

 

※ Workspace subsystem:

 

Workspace subsystem A separate area that needs to set up a terminal device (TE) should be divided into a workspace. The working area shall consist of a connection cable and adapter extending from the information socket module (TO) of the wiring subsystem to the terminal device.

 

※ Wiring (horizontal) subsystem:

 

The wiring (horizontal) subsystem shall be composed of the information socket module in the work area, the wiring cables and optical cables from the information socket module to the telecommunication wiring equipment (FD), the wiring equipment in the telecommunication room, the equipment cables and jumpers, etc.

 

※ Trunk (vertical) subsystem:

 

The trunk (vertical) subsystem shall consist of trunk cables and optical cables from the equipment room to the telecommunications room, building wiring equipment (BD) installed in the equipment room, and equipment cables and jumpers.

 

※ Architectural subsystem:

 

The building complex subsystem shall consist of trunk cables and optical cables connecting multiple buildings, building complex wiring equipment (CD) and equipment cables and jumpers.

 

※ Interdevice subsystem:

 

The inter-device subsystem is the site for network management and information exchange at the appropriate location in each building. For integrated wiring system engineering design, the equipment room mainly installs building wiring equipment. Telephone switches, computer host equipment and access facilities can also be installed together with wiring equipment.

 

※ Incoming line room:

 

The access room is the entrance part of the external communication and information pipeline of the building, and can be used as the installation site of the entrance facilities and the wiring equipment of the building group.

 

Management: The management shall identify and record the distribution equipment, cables, information socket modules and other facilities in the working area, telecommunication room, equipment room, and incoming line room according to the specified mode.

 

Note: The assembly point (CP point) can be set in the wiring subsystem, or the assembly point can not be set.

 

1.4 System design principles

 

The construction of structured integrated cabling system (PDS) of xxxx project is a comprehensive and unified information system project, which will meet the current and future development of network communication technology and realize the transmission of voice, data and image information. The solution will provide a comprehensive and scalable solution to achieve flexibility and consistency in system implementation. The scheme fully understands the user's requirements for intelligent engineering construction in the design, makes a comprehensive analysis of the current and future application and connection needs of the system, and can be easily and smoothly implemented when the system needs to be expanded and expanded for the next step.

 

The solution will provide a comprehensive and scalable solution to achieve flexibility and consistency in system implementation. The scheme fully understands the user's requirements for intelligent engineering construction in the design, makes a comprehensive analysis of the current and future application and connection needs of the system, and can be easily and smoothly implemented when the system needs to be expanded and expanded for the next step.

 

In order to meet the needs, the integrated wiring system design follows the following principles:

 

* Compatibility: This is the primary feature of structured cabling system, compatibility refers to its equipment can be used in a variety of systems performance. Because the structured cabling interface adopts standardized design, it can support different manufacturers and different types of equipment.

 

※ Openness: The structured cabling system uses an open architecture, which meets the international popular standards. The system is open to the products of all famous manufacturers in the world, providing an open hardware platform.

 

※ Scalability: The scalability of the system must be considered in the design to avoid unnecessary equipment waste caused by the owner's need to upgrade in the future.

 

※ Reliability: The use of high-quality materials and combined crimping methods to form a set of high standard information channel. All devices are ISO certified, and each information channel uses special instruments to check electrical performance such as line impedance, attenuation rate, and crosstalk to ensure transmission quality. The wiring system adopts the star physical topology structure, point-to-point connection, the failure of any line does not affect the operation of other lines, but also provides great convenience for line maintenance and troubleshooting, thus ensuring the reliable operation of the system.

 

※ Advanced: The application of the integrated wiring system is very flexible, and the twisted pair or twisted pair and optical cable mixed wiring mode constitutes a reasonable and complete wiring system. All cabling adopts the latest communication standards in the world. The channel connection complies with B-ISDN design standards and is configured on an eight-core twisted pair.

 

※ Economy: Integrated wiring process unified planning, unified construction and installation of various cables, reducing unnecessary repeated wiring and repeated construction, saving wire, saving labor, saving investment and improving efficiency on the whole.

 

1.5 Standards and specifications for integrated wiring systems

 

The integrated wiring system has gradually developed into an industry, like computers and buildings, there must also be standard specifications. At present, the standards for integrated wiring systems and their products and acceptance tests have been introduced:

 

International standards and norms are:

 

International wiring standard ISO/IEC 11801-2002

EIA/TIA 568B General Cabling Standard for Commercial Buildings

EIA/TIA 568B General Cabling Standard for Commercial Buildings

EIA/TIA 569 Standard for Communication Cabling Slots and Spaces in Commercial Buildings

EIA/TIA-606 Standard for the Management of Communications Infrastructure in Commercial Buildings

European standards: EN5016, EN50168 and EN50169 are horizontal distribution cables, jumpers and terminals respectively

 

End connection cable and vertical distribution cable.

 

EIA/TIA TSB67 "Unshielded Twisted Pair Transmission Performance Field Test Specification"

EIA/TIA/EIA568-A "100 Ohm 4 pairs of Super 5 Type Unshielded Twisted pair Additional Transmission Performance Specification"

ANSI/TIA/EIA568-B.2-1 "100 Ohm Class 6 Unshielded Twisted Pair Transmission Performance Specification"

EIA/TIA TSB-72 standard Standard for centralized fiber cabling systems

EIA/TIA TSB-75 standard Open office cabling system standard

BS800, EN55014 Radio interference limit

BS7430- Grounded BS2757, IEC8- Classification of insulation materials

Domestic standards and norms are:

 

Code for Engineering Design of integrated Wiring Systems for Buildings and Buildings GB/T50311-2007

Code for Construction and Acceptance of Integrated cabling Systems for Buildings and Buildings GB/T50312-2007

"Intelligent Building Design Standard" GB/T50314-2007

General Specification for Building Integrated Wiring System YD/T 926.1-2001

Technical requirements for cables and optical cables for integrated wiring YD/T 926.2-2001

Technical requirements for connection hardware for integrated cabling YD/T 926.3-2001

Communication Industry Standard of the People's Republic of China YD/T 1019-2001

Design Code for Industrial Enterprise Communication Grounding GBJ79-85

Code for Electrical Design of Civil Buildings JGJ/T16-92

Safety Requirements for Computing Station Sites

Code for Fire Protection Design of Buildings

Code for Construction and Acceptance of Electronic Computer Room SJ/T3000393

Design drawings and system requirements specifications provided by the owner

 

1.6 General selection principles of integrated wiring system products

 

The choice of good integrated wiring products, scientific design and careful construction is the "centennial plan" of intelligent buildings. As far as the current situation of our country is concerned, there are many products in the domestic market at present. Among the many products, most of them meet the standard appearance size, but the electrical performance, structural characteristics and reliability indicators that meet the EIA/TIA 568B standard are also very important and often overlooked. Therefore, in the selection of products, to choose one of the professional body certification and meet the standards of the product, it is not recommended to choose a number of products in an engineering project, otherwise in the reliability of the system can not meet the requirements, will affect the effect of the entire wiring system, difficult to protect the user's investment. Because the integrated wiring is to unify all kinds of weak current system disputes and inconsistencies, inflexible and created, if the transmission performance and electrical parameters are inconsistent in the wiring system, it is exactly the opposite of the original intention of the integrated wiring. Therefore, the selection of consistent, high-performance wiring materials is an important part of integrated wiring.

Integrated cabling system is a set of complete cabling system, the system with twisted pair and optical fiber as the transmission medium, to meet the user's various voice, data, control lines and image transmission needs. This cabling system can support the world's major computer devices through media converters, and can support a variety of local area networks such as Ethernet, token ring network and other network architectures.

 

The product has the following advantages:

 

Openness:

 

The integrated wiring system strictly follows the international standards of the wiring system, is a fully open wiring system, can be compatible with different transmission media of different manufacturers of equipment

 

Flexibility:

 

The opening and change of all equipment do not need to change the system wiring, only need to make the necessary jumper management, not only to meet the needs of the current information transmission, but also to adapt to the future network structure changes or equipment expansion

 

Easy to use:

 

The installation panel of the working area subsystem is marked with data and voice, which is convenient for users to use

 

Easy to manage:

 

The products used for the management of the distribution frame of the subsystem between the devices are identified by the port number, which is easy to manage and maintain

 

High reliability:

 

The installation panel of the working area subsystem is dust-proof design to effectively prevent dust from entering, and the contact part of the product is gold-plated to ensure the stable contact performance of the product. The metal part of the data module and distribution frame and other products are made of specially customized high-phosphorus copper, and the plastic is made of high-strength polycarbonate to meet multiple terminations

 

Three. Integrated cabling system solution

 

3.1 Overview of the FTTH system solution requirements

 

1. Project Overview:

 

XXXXX, a total of X residential buildings, the actual project introduction.

 

In the XXXX project, FTTH optical fiber access method is adopted in the integrated wiring system, and an optical fiber entry box is set up in each household for the introduction of vertical and horizontal leather cable optical cables in each building. The optical fiber entry box in each household can be set up with different sizes and different specifications of weak current module strips or photoelectric conversion equipment for broadband network, voice telephone and cable TV signal access and distribution. The main access equipment OLT, floor spliter ODN and indoor conversion equipment ONU/ONT in FTTH system in the network center machine room are not within the scope of this design, and will be provided by operators or other equipment manufacturers.

 

This program pays attention to the quality, science and advanced nature of the system; At the same time, taking into account the characteristics of the residential building, in order to meet the existing application and leave a margin for the future on the basis of flexible configuration. Therefore, the system design and product selection focus on the quality of wiring products, the modularity of wiring systems, the flexibility of use, and the manageability and maintainability of the system. Thus, the wiring scheme suitable for FTTH system in residential buildings is designed.

 

2. Customer demand analysis and design

 

Location of the main equipment room

 

According to the drawing requirements, in the XXXX project, the network center machine room is located in the weak current machine room of the operator in XXXX.

 

The FTTH system architecture diagram in this residential building scheme is as follows:

 

Distribution between management

 

In the XXX project, according to the requirements of the drawings, the specific Settings of the management rooms of each building and each floor are as follows:

 

In the XXX project, X#-X# residential building, a total of X floor distribution rooms are designed, in each floor distribution room is set up a 24-port rack optical fiber distribution frame and a floor of 2 meters high standard cabinet, responsible for unified access to the cable of the access floor, welding, storage and distribution management.

 

Integrated wiring system design is as follows:

 

In XXXX project, from the network center of XX to the distribution room of each floor of each building, XX core single-mode optical cable is used to connect to the optical fiber distribution frame or cable handover box of each floor of each building, and XXX core indoor single-mode optical cable is branched out of the cable handover box to the OBD box of the floor. The OBD box is connected to the optical fiber access box installed in each household on each floor through a 2-core leather cable cable, so as to achieve the optical cable laying requirements in the FTTH system. The specific connection diagram is as follows:

The project covers the following areas:

 

Integrated cabling system design, supply, installation, connection, testing, acceptance, system quality assurance, technical support, after-sales service, training and certification;

 

Coordinate the design and installation work with other related majors (architecture, structure, water, wind, electricity, fine decoration, etc.);

 

Assist in the commissioning of various systems related to this system, such as telephone communication, computer network, video conference, computer room, etc.;

 

Pipeline, bridge construction progress and quality management and supervision inspection.

 

3. Demand for integrated cabling system

 

In the XXXX project, starting from the needs of residential comfort and network information, the design and implementation of an advanced and reasonable FTTH cabling system is one of the core systems of intelligent construction in order to ensure efficient, convenient and fast services and scientific modernization of management services.

 

According to the actual floor statistics in the drawing, XXX households are designed in the X-X# building of XXXX project. Each household is equipped with a comprehensive information box or optical fiber access box of 350*300*120 specifications. From the optical fiber access box to the information terminal socket (network broadband point, telephone point) in each household, more than five types of twisted pair cables are used to lay. The specific requirements of the indoor integrated information box are as follows:

In each building and each household, the comprehensive information box to the weak current information socket, will be unified by the use of super five types of unshielded twisted pair wire wiring, broadband socket and telephone socket are set to the combination of super five types of unshielded information module and panel installation. According to the drawings, XXX non-shielded information points of over five categories are designed in X-X# residential buildings.

 

3.2 Description of the overall planning of the integrated wiring system in this design scheme

 

People's requirements for housing have evolved from the pursuit of quantity (the availability of housing and the size of the area) to the pursuit of quality (comfort, safety, convenience, multi-functional). Residential intelligent system is developed to meet the needs of people. Residential intelligent system is the latest application of modern high-tech in residential construction, which is based on the high development of science and technology.

 

With the progress of science and technology, especially the rapid development of computer technology, control technology, communication technology and information technology, the intelligence of residential communities and homes has a reliable technical basis. At the same time, due to the progress of science and technology, people's living habits and working methods are also inexorably undergoing great changes, making residential communities and home intelligence more and more urgent. At present, the residents of community housing have higher requirements for intelligence; Community housing developers have also realized the necessity and urgency of the implementation of residential intelligent system, which can significantly improve the market competitiveness of residential sales.

 

For residents, the practical significance and fundamental purpose of residential community intelligence and home intelligence is:

 

Keep your home safe

 

Comfortable and convenient life

 

Fast and smooth information

 

Orderly and efficient management

 

The construction objectives of FTTH system in XXXX are as follows: Guided by modern science and technology and supported by the current international leading level of integrated wiring technology, optical fiber to the home, computer technology, communication technology and automation technology, a set of unified planning, highly integrated, modular and open wiring system is established. Provide unified transmission lines, equipment interfaces and high-quality transmission performance for FTTH systems, images and control signals in XXXX.

 

Specifically, the fiber to the home integrated wiring project focuses on solving the following problems:

 

To establish a unified planning, highly integrated, and highly flexible cabling system, fiber to the home network construction needs. At the same time, the wiring system takes into account the future development requirements of the network system in the residential building, has a certain expansion ability, and provides a 20-year application guarantee;

 

Structured fiber to the home integrated cabling system is the current international and domestic commonly used advanced cabling system, it completely overcomes the defects of traditional cabling, data, voice, image and other types of systems integrated into a unified structured standard cabling system, the cabling system design, equipment, installation construction and management are included in the track in line with international standards. It is fully compatible with the current international and domestic electrical and electronic standards and various products, all kinds of systems and products can easily enter the wiring system, and the performance indicators of the wiring system are greatly advanced, both fully meet the needs of the current application, and can adapt to the trend of development.

 

In the design process, the optical fiber to the home integrated wiring system in the residential building follows the following principles: practicability and scalability, advanced and feasibility, flexibility and economy.

 

The number of information points in each household is designed according to the requirements and functions of the drawings, and the scheme uses optical fiber to the home and over five types of unshielded wiring system as the solution.

 

The integrated cabling system adopts modular design and hierarchical star network topology. It is composed of six subsystems: working area subsystem, wiring (horizontal) subsystem, trunk (vertical) subsystem, management subsystem, equipment subsystem and building complex. The design of the scheme fully considers the advantages of high reliability, advanced nature, flexibility, extensibility, easy management and high cost performance

 

The following is the schematic diagram of the six subsystems of the standard structured integrated wiring system:

According to the actual requirements of the drawings, due to the use of optical fiber to the home system solution, in the residential building project, only the working area subsystem, the horizontal area subsystem, the vertical trunk subsystem and the management of the four subsystems.

 

3.2.1 Product selection of workspace subsystem

 

The working area subsystem consists of a terminal conversion adapter, a workstation and a telephone terminal connection line and related wiring components. A separate area where terminal devices need to be set up can be divided into a workspace. The workspace subsystem consists of a user connection cable and an adapter extending from the information socket to the workstation terminal.

 

In the XXXX project, the working area subsystem mainly includes two parts: optical fiber access box and super five types of non-shielded sockets of the terminal. Each building will be set up in each household a 350*300*120 size indoor integrated information box for fiber to the home dedicated access box.

 

3.2.1.1 Optical Fiber Access

 

The fiber access part of this scheme adopts FSS type metal fiber access box

FSS type metal fiber optic door box

 

Panel material: high quality cold rolled plate + surface white fine lines electrostatic spraying, integrated molding, beautiful scratch resistance

Panel thickness :0.8mm

Opening mode of the door panel: Open and close to the left

Door opening Angle: The maximum opening Angle is 170 degrees

Bottom box material: steel plate + white spray

Bottom box steel plate thickness: 1.0mm

Specification and size of information box inlet hole:

Provides 5 10M/100M adaptive high-speed network ports, can establish a small LAN connection of 4 computers, but also can realize the printer connection and the sharing of resources within the LAN.

Product Model: AP-J-02-5SD

Panel material: high quality cold rolled steel plate + surface black electrostatic spraying

Panel size: 25* 230mm

Panel thickness: 1.2mm

Occupied space: 0.5U

Power supply requirement: DC7.5V

Installation method: Install in the information box with screws

Installation temperature: -10 ~ +50℃

Storage temperature: -20 ~ +70℃

Installation humidity: 20% ~ 90%RH

Storage humidity: 10% ~ 95%RH

Module of a five-port switch

Provide telephone voice interface 1 group 1 in and 5 out, select RJ11 port.

IN is an external port, and the other 5 ports are assigned ports.

Product model: AP-J-02-15V

Panel material: high quality cold rolled steel plate + surface black electrostatic spraying

Panel size: 25* 230mm

Panel thickness: 1.2mm

Occupied space: 0.5U

Installation method: Install in the information box with screws

Installation temperature: -10 ~ +50℃

Storage temperature: -20 ~ +70℃

Installation humidity: 20% ~ 90%RH

Storage humidity: 10% ~ 95%RH

1 in 4 out cable TV module bar

Provide cable TV signal interface 1 group 1 in 4 out, two-way bandwidth 5-1000MHz, full band attenuation is not more than 8dB, support digital TV and cable bandwidth.

If there are more than one unused port, use the impedance terminal to connect it.

Product Model: AP-J-02-14C

Panel material: high quality cold rolled steel plate + surface black electrostatic spraying

Panel size: 25* 230mm

Panel thickness: 1.2mm

Occupied space: 0.5U

Installation method: Install in the information box with screws

Installation temperature: -10 ~ +50℃

Storage temperature: -20 ~ +70℃

Installation humidity: 20% ~ 90%RH

Storage humidity: 10% ~ 95%RH

3.2.1.2 Installing the Optical Fiber Desktop Department

 

Adapter module is used in the data and voice parts of this scheme

Optical fiber adapter module

 

Optical fiber adapter module

 

Connector type: SC-SC/LC-LC/ST-ST/FC-FC

Coupler casing material: high strength high density zirconia casing

End face type: PC end face

Insertion loss: ≤0.2dB/ interface

Return loss: ≥50dB

Repeatability: ≤0.2dB

Interchangeability: ≤0.1dB

Product matching: Match the matte panel without dustproof door, it is recommended to choose the bottom box with a depth of more than 50mm;

Insertion times: ≥1000 times

Operating temperature: -20 ~ +60℃

Storage temperature: -20 ~ +60℃

 

 

 

Matte single port clean panel Matte double port clean panel

 

Yaguang 86 panel

 

Panel type: 86*86mm

Number of panel ports: Two ports

Panel body plastic material: high quality ABS engineering plastic

Identification: Label containing plexiglass

Connection mode: Directly connect to the information module

Port identification: Built-in ICON to distinguish network and voice port applications

Border removal: side removal of the border, more convenient and labor saving

Installation method: Use the double screws in the panel package

Compatibility: Compatibility: Optional optical fiber adapter for optical fiber to the desktop 86 panel installation;

Operating temperature: -40 ~ 70℃

Humidity: 85% (temperature 85℃±3℃)

3.2.1.3 Installation Description of the Workspace subsystem

 

The information socket is concealed on the wall (special application environment can consider the suspended ceiling, ground or open installation) the bottom edge is 30 cm away from the ground. For the convenience of use, each group of information sockets is required to be equipped with 220V power sockets to supply power to data devices, and the installation position is not less than 10 cm away from the information seat according to the standard recommendation. The RJ45 embedded information socket should be 20cm away from the power socket next to it.

 

As shown in the picture below:

 

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3.2.2 Product selection of wiring (horizontal) subsystem

 

The horizontal wiring subsystem can also be called the horizontal subsystem. The horizontal wiring subsystem is a part of the entire wiring system, which starts from the RJ-45 socket to the distribution frame of the management subsystem, and the structure is generally star-shaped.

 

In the XXX project, the horizontal subsystem consists of more than five types of unshielded twisted pair cables and 2-core leather cable cables.

 

3.2.2.1 Cable with leather Cable

 

GJXFH type two-core non-metal lead-in cable will be used in the residential part of the leather cable

 

 

 

GJXFH type non-metal lead-in cable

 

Outer sheath material: LSZH

Optical cable size: 3.0*2mm

Optical cable weight: 9.0kg/KM

Reinforcement material: FRP

Optical fiber Type: G.657A Optical fiber

Number of cores: 1-4

Core color: blue, orange, brown, green

Attenuation: @1310≦0.40dB/km; @ 1550 nm ≦ 0.30 dB/km

Cut-off wavelength: ≦16250nm

Tensile strength: 10MPa

Elongation at break: 125%

Separability: It is relatively easy to separate the cable 200mm from the cable separation port, and the minimum breaking force is not less than 3N, and the maximum value is not more than 10N

Minimum bending radius of laying: dynamic bending radius ≥30 times the outer diameter of the cable

Static bending radius ≥15 times the cable diameter

Installation tension: It is recommended that the short-term installation tension ≤80N

Pulling force: Long-term pulling force ≤40N is recommended

Laying flattening force: It is recommended that the short-term flattening force ≤1000N during laying

Flattening force: Long-term flattening force ≤500N is recommended

Construction temperature: 0 ~ 40℃

Operating temperature: -40 ~ 70℃

3.2.2.2 Cabling (Horizontal) Sub-system Installation Description

 

The cables of the wiring (horizontal) subsystem lead from the management subsystem to the information socket of the work area subsystem. The light prefabricated trough cable bridge is a closed type metal bracket installed in the ceiling. When entering the work area, the metal pipe or PVC pipe is drawn from the cable trough, and the cable is led down (or up) along the wall to each information point in the way of embedding, and the cable is led to the hidden box on the wall.

 

The wiring of structured system is radial and the cable quantity is large, so the calculation of the slot capacity is very important. According to the standard cable groove design method, the capacity of the cable groove should be determined according to the outer diameter of the horizontal line, that is, the cross-sectional area of the cable groove = the sum of the cross-sectional area of the horizontal line X 2 Too much twisted pair density in the online groove will affect the transmission performance of the bottom twisted pair.

 

The material of the groove is cold-rolled sheet, and the surface can be treated accordingly, such as galvanized, spray, paint, etc. The troughs can be selected with different specifications according to the situation. To ensure the turning radius of the cable, the cable trough must be equipped with branch accessories of corresponding specifications to provide free bending of the route.

 

At the same time, in order to ensure the safety of the line, the tank should have a good grounding end. Metal cable troughs, metal hoses, cable trays and distribution boxes should be connected as a whole and then grounded. If you cannot determine the exact position of the information outlet, route the cable to the cable outlet in the suspended ceiling. After the specific position is determined, route the cable to each information outlet.

 

Generally, the cable groove has multiple turns, and enough space should be left at the turning point to ensure that the twisted pair has a sufficient bending radius, which can ensure the transmission performance of the system.

 

The turning point of the slot should be padded to reduce the friction when pulling the wire.

 

As shown in the picture below:

 

 

Note:

 

When installing a horizontal line in an open environment, it should be at least 5 feet (120mm) away from the fluorescent lamp.

 

Ensure that the length of the horizontal cable does not exceed 90 meters.

 

During construction, maintain a certain distance from the power line in accordance with EIA/TIA-569 standards,

 

The following table:

 

EIA/TIA-569 recommends the distance between communication lines and power lines

3.2.3 Product selection of management subsystem

 

The management subsystem is arranged in the equipment room of each building group, and is composed of the corresponding distribution panel and auxiliary accessories. With the help of management subsystem, different network topologies can be realized. Flexibility to change user routing when staff locations are moved or adjusted.

 

3.2.3.1 Data Optical Fibers

 

The management part of the data fiber backbone connection consists of a rack-mounted 24-bit optical fiber distribution frame, an SC fiber adapter, and single-mode SC-SC jumper (dual-core)

 

 

 

24-bit rack-mounted optical fiber distribution frame

 

24-bit rack-mounted optical fiber distribution frame

 

19 inch standard rack mounted equipment, beautiful appearance, strong structure.

The distribution box is a completely enclosed dust-proof structure and can be installed with two 12-bit coupler mounting bars, which can accommodate up to 48 core optical fiber welding.

The wiring box contains the coupler mounting plate and the fiber fusion disk structure. The coupler mounting plate is installed with tool-free fastener screws, and the fusion disk is stackable design, making construction and installation convenient and quick.

The cable core is fused with the pigtail, and the pigtail is connected with the optical fiber coupler. The coupler is installed on the port of the optical fiber distribution frame. Provides optical fiber redundancy and pigtail redundancy protection.

It is used for fixing and protecting optical cables and distributing optical links.

 

 

Coupler mounting plate

 

Coupler mounting plate

 

It is used to attach optical fiber couplers and mounting panels to optical fiber distribution frames.

The installation panel is made of aluminum CNC mold punching, the surface is treated with black spray plastic, and the fasteners are selected for installation.

There are three types:

1, SC simplex /LC duplex coupler mounting plate, 12 coupler mounting holes, support 12 or 24 core welding.

2, ST simplex /FC simplex coupler mounting plate, 12 coupler mounting holes, support 12-core welding.

3. Install the blind plate.

Note: The SC simplex /LC duplex coupler mounting plate is the optical fiber distribution frame. The mounting plate is provided with the package. The other two are available for customers to choose according to their needs.

The surface of the mounting plate has a digital identification of the port, which makes management easier.

The mounting plate is assembled with snap screws, which can be easily installed without tools.

 

 

SC simplex fiber adapter

 

SC fiber optic adapter

 

Optical fiber adapter, also known as flange, is used to connect the optical fiber connector plug.

Imported ceramic flanges are used to connect optical fiber interfaces for optical fiber welding, optical fiber wiring, optical fiber equipment connection and other occasions.

Conventional can provide FC-FC, LC-LC, ST-ST, SC-SC four kinds of fiber connector interface and single and double core structure fiber coupler.

Install on the optical fiber panel and optical distribution frame coupler mounting plate.

 

 

Single mode SC-SC Jumper (Single core)

 

Single mode SC-SC Jumper (Single core)

 

Both ends of the fiber jumper have fiber active connectors for network connection.

The optical fiber connector of the PC end face is used to end the single-core optical fiber for optical fiber welding, optical fiber wiring, optical fiber equipment connection and other occasions.

Conventional can provide FC-FC, LC-LC, ST-ST, SC-SC four kinds of fiber connector interface and single and double core structure fiber jumper.

Before use, ensure that the ceramic end face of the connector is clean. You can use a dust-free cleaning paper dipped in high concentration alcohol (more than 90%) to clean.

Provide MII reports

3.2.3.4 Network Cabinet Section

 

The network cabinet is a standard cabinet

 

 

Standard cabinet

 

Standard cabinet

 

All black cabinets, internationally popular metal mesh doors and 2-4 fans in the upper cabinet ensure good heat dissipation performance.

Cable inlet holes are provided at the lower part of the cabinet for easy construction.

The cabinet is equipped with four cabinet supporting feet and four cabinet pulleys for easy movement and accurate positioning.

The cabinet has the advantages of simple structure, convenient operation and installation, exquisite technology and precise size. For mounting and housing standard 19 "rack mounted equipment.

Characteristic parameters:

Cabinet material: SPCC high quality cold rolled steel plate.

Surface treatment process: degreasing, pickling, phosphating, electrostatic spraying (black).

Door type: Metal mesh door.

Thickness of cabinet materials: main frame 1.8mm, bearing beam 2.0mm, pallet 1.2mm, side door 1.2mm, other 1.0 mm.

Load capacity: static load 500Kg, each layer of the plate up to 100Kg.

Cabinet accessories: Two cooling fans at the top, two layers of trays, and one six-hole power socket.

Installation temperature: -10 ~ +50℃.

Storage temperature: -20 ~ +70℃.

Humidity: ≤85% (temperature 85℃±3℃).

Packing and ordering requirements: The cabinet is disassembled and packed, and the volume is about 1/2-1/3 of the volume of the entire cabinet.

3.2.3.5 Inter-Management Subsystem Environment Requirements:

 

The intermanagement subsystem is an important component of the whole cabling system. Its layout, selection and consideration of environmental conditions are appropriate, which directly affects the normal operation and maintenance of the future information system, and the flexibility of use. In this regard, the following recommendations will be made:

 

Indoor lighting is not less than 150Lx;

 

In order to ensure the possible use of power during installation, testing and future maintenance, it is recommended to install several power sockets, each of which has a capacity of not less than 300W (if there are other devices);

 

According to the actual demand of the network equipment on the floor, equipped with a power supply system (including UPS system) that can meet the needs of use;

 

The subsystem between management should be as close as possible to the weak current shaft to facilitate wiring and save investment.

The ambient operating temperature of the network devices in the management subsystem should be kept between 18-27 ° C.

 

The humidity of the management subsystem should be kept between 30% and 50%.

 

In order to ensure the good working performance of various sockets on the distribution frame, it is required to have good ventilation in the subsystem of the management room, and to achieve indoor dust-free;

 

In order to facilitate construction and maintenance, it is recommended that the size of the floor wiring room is greater than 10 square meters (wiring system).

 

According to the recommendation and the convenience of network management, the information points managed by the floor distribution frame are not more than 200, otherwise it will be inconvenient to manage and the confusion of the line.

 

3.2.4 Product selection of trunk (vertical) subsystem

 

The trunk (vertical) subsystem consists of trunk cables and optical cables between the management subsystem and the equipment, and is used to complete the backbone of the data transmission.

 

3.2.4.1 Trunk Optical Cable

 

Indoor 72 and 48-core tight-jacketed single-mode optical cable is selected for the data part of this scheme

 

 

 

GJFJV type indoor single-mode tight-fitting cable

 

GJFJV type indoor single-mode tight-fitting cable

 

With the tight-sheath fiber as the unit, a suitable anti-tension material is laid around a single or multiple tight-sheath fiber as the protection material, and a layer of sheath material is extruded to make a single or multi-core tight-sheath fiber cable.

The tight-coated optical fiber is a 900μm tight-coated optical fiber that is cured by ultraviolet light with an outer diameter of 250μm and then directly coated with a layer of material.

Features: The outer diameter of the compact fiber in the fiber is uniform, good stripping property, good flame retardant performance of the arnylon filament, the product's high and low temperature additional attenuation is small, and the geometric size and transmission performance of the fiber meet the needs of users.

Attenuation coefficient: @1310nm≤0.36dB/km; @1383nm≤0.35dB/km; @1550≤0.22dB/km; @ 1625 nm 0.30 dB/km or less

Fiber attenuation heterogeneity: ≤0.05dB

Macro bending loss: @ (100 turns 30mm diameter) ≤0.1dB

Laying method: indoor pipe, bridge laying

Minimum bending radius of laying: dynamic bending radius ≥20 times the outer diameter of the cable

Static bending radius ≥10 times the cable diameter

Installation tension: It is recommended that the short-term installation tension ≤660N

Use tensile force: It is recommended that the long-term tensile force ≤200N

Laying flattening force: It is recommended that the short-term flattening force ≤1000N during laying

Flattening force: Long-term flattening force ≤300N is recommended

Provide CE, ROHS certification

3.2.4.2 Trunk (Vertical) Subsystem Description

 

The use of optical fiber as a transmission medium has: Support long distance, wide frequency band, large communication capacity, not affected by electromagnetic interference and static interference, in the same cable, almost no crosstalk between neighboring fibers, good confidentiality, fine wire diameter, small size, light weight, low decay, low error rate advantages, greatly improve network reliability, while making the system has a very high upgrade capability, We choose the vertical subsystem topology as the star topology because the star topology is easy to manage, and all the communication of the star topology is dominated by the central node, so the maintenance and management is more convenient. Easy to reconfigure. Users can arbitrarily add, delete, move, or exchange one or more information sockets on the floor distribution frame, and only in relation to the terminal devices to which they are connected. Facilitate fault isolation and detection. Since each information point is connected to the floor distribution frame and maintains considerable independence from each other, the fault point can be easily detected and removed. It is easy to segment, cascade and expand the system. The telephone voice backbone all uses category 3 twisted pair cables. Each telephone has a pair of cables. It is recommended to reserve 20% of the cables as backup.

 

3.2.4.3 Construction description of the trunk (vertical) subsystem

 

1, the vertical part of the trunk line:

 

The function of the vertical section is to provide access to the vertical dry cable in the weak current well. In this part, a reserved cable well is used to set aside a rectangular floor in the weak current well of each floor for the passage of a large number of integrated wiring cables. The position of the cable well is located near the wall of the branch cable, but does not hinder the place where the end of the distribution frame is connected. A row of holes should be opened on the transverse of the climbing frame or cable trough, and a large number of cables should be tied to it with a fastening rope for fixing and bearing. If there are large interference sources such as elevators nearby, closed metal cable trough should be used to provide shielding protection for the vertical dry cable.

2. Horizontal channel part of the trunk line:

 

The function of the horizontal channel part is to provide the vertical dry cable from the main equipment room to the weak current well on the floor. This part should also adopt the scheme of light assembly trough cable bridge with suspended ceiling to place and guide the cable, which can play a role in mechanical protection of the cable. It also provides a fireproof, airtight, sturdy space for the vertical dry cable so that it can be safely extended to its destination. The material selection algorithm is consistent with the wire slot algorithm of the horizontal subsystem design part, and if a wire tube has two 90-degree corners in a row, a wire box should be added at one place so that the cable will not be damaged when the wire is pulled. Like the vertical part, the horizontal channel part must also retain a certain amount of space to ensure that new pipes and slots do not need to be installed when the system is expanded in the future.

 

The scheme can meet the requirements of various computer network systems for wiring systems. The computer network can be connected by fiber optic jumpers on the structure, and supports various computer networks through various network protocols.

 

The standard cabinet is adopted, and all information points pass certain coding rules (the rules will be based on wiring standards, user ideas and engineering experience) and color rules to facilitate user use and management. Chassis and box of the cabinet. Order domestic supporting products, its color and the surrounding environment to maintain consistency.

 

3.2.5 Integrated wiring system diagram

 

See the drawing for details

 

Four. Construction scheme of integrated wiring system

 

4.1 Overview of system construction scheme

 

Project implementation is the key to the success or failure of the entire system construction, its purpose is not only to provide a good quality system that meets the current needs, but also to provide maximum convenience for future maintenance and upgrading.

 

High technical content of integrated wiring, strict international and domestic standards for various technical indicators, the quality of the wiring system has a direct impact on the network running on the wiring, the installation of integrated wiring, cable laying, termination and testing work must be strictly operated in accordance with the specification, so the construction unit and construction personnel must be based on this specification through strict technical training. To carry out construction.

 

The integrated wiring is generally carried out simultaneously with the building decoration project, and the construction of other construction units, any accident may bring heavy losses and affect each other, so all the personnel participating in the construction must carry out safety education, especially fire prevention and other aspects of education.

 

The cost of integrated wiring materials is high, most materials are easy to damage, and improper cable cutting will cause unnecessary losses. Therefore, a perfect system must be established for the storage, distribution and use of materials.

 

The construction unit must actively coordinate with other related units in the construction site, and the coordination work must also have a perfect system. In the implementation of the integrated wiring system, the construction site must have a strict and controllable construction quality and construction technology, construction process supervision system, and the establishment of perfect quality supervision and various construction records and reports

 

Before the start of the project, we should fully prepare for all aspects of the work, earnestly implement the various systems, and the construction process and process treatment must be put forward in advance and coordinate with other construction units, and finally make our construction quality reach the high quality standard.

 

Engineering implementation method is a comprehensive work, the core of which is effective management

 

Engineering site management

Technical management of the project

Engineering quality control

Safe production and civilized construction

Project implementation steps, key points and countermeasures

Engineering construction drawing design

 

In the process of project implementation, before construction, we should first do a good job in the design of construction drawings.

 

Construction procedure

 

The construction steps of the project described in this scheme are included in the detailed construction schedule and will be further detailed after entering the site.

 

Construction preparation: The joint examination and technical disclosure of construction design drawings shall be organized by Party A or the weak current general contractor, and our technical personnel and foreman shall participate; According to the progress of the project, our technicians will put forward the construction material plan, construction machinery and testing tools and instruments, and settle the construction labor force, and do a good job in the safety, fire protection, technical disclosure and training of the construction team.

Cooperate with the main structure and decoration, be familiar with the structure and decoration pre-buried drawings, check the pre-buried location size, as well as the relevant construction operation, technology, regulations, standards and construction acceptance specifications; With the progress of the structure and decoration works, supervise the pre-buried installation of the pipe box and the laying of the cable channel, so as to achieve good, no leakage and no blockage. After the completion of the subdivision concealed works, Party A shall cooperate with Party A in timely acceptance and handle the signing procedures of hidden inspection in time.

Unpacking inspection: First of all, the equipment and materials team shall be responsible, and the technical and quality supervision team shall participate in the visual inspection of the equipment and materials that have arrived at the construction site to ensure that there is no trauma damage or missing parts, check the spare parts, check whether the model, specification and quantity of the equipment, materials, cables, wires and spare parts meet the requirements of the construction design documents and lists, and fill in the unpacking inspection report truthfully and timely.

When laying all kinds of cables, with the end of tube box embedding and the gradual progress of cable trough laying and decoration, cables should be threaded and checked according to the professional design and construction drawings in a timely manner, and test records should be made in a timely manner.

Inspection of the cable laying working surface: The quality supervision group is responsible for the acceptance of the equipment and lines in strict accordance with the requirements of the construction drawings and documents and the standards specified in the relevant specifications.

Cabinet positioning and installation: Retest the specific position and dimensions of the cabinet according to the design drawings, and install the cable tray in place.

Cable termination test: Construction shall be carried out in strict accordance with the installation technical specifications and standards of the design document. After the termination is completed, 100% shall pass the test of 6 types of performance and installation process inspection, and make corresponding records and labels.

System self-inspection: After the equipment is terminated and the test is completed, the quality supervision group and technical support group shall organize relevant personnel to carry out careful inspection and key spot check (10% spot test) according to the construction design documents and relevant regulations, confirm the correctness and meet the relevant regulations, and then organize the completion data and report for inspection.

System acceptance: Organized by the weak current general contractor, coordinated by the integrated wiring group, Party A and the supervision company participate in the final acceptance of the wiring system, agree to put into use, and begin to calculate the warranty period.

System commissioning and commissioning: The technical support group and the site construction group shall be responsible for the jumper of telephone communication, computer network and other applications as required by Party A, commissioning and commissioning, and the jumper data shall be prepared and handed over to Party A after the system acceptance.

System training: The technical support team shall be responsible for training the management personnel of Party A on the use of the system, and the specific arrangement shall be agreed by both parties.

Matters needing attention

 

1. No construction plan (or brief construction plan), no construction without disclosure of the plan, no construction of the team before the work, the construction team should seriously do a full disclosure activities and records, every Monday morning to organize not less than 1 hour of safety activities. Strictly implement the operation rules, shall not violate the rules of operation, the instructions for illegal operation have the right to refuse and have the responsibility to stop others from violating the rules of operation.

 

Entering the construction site must strictly abide by the six major disciplines of production safety and strictly implement the production safety regulations. Personal protective equipment must be properly worn during construction work, and helmets must be worn when entering the construction site. Do not use fire without permission. Do not drink.

Personnel engaged in high-altitude work should have regular physical examination. Persons suffering from hypertension, heart disease, anemia, epilepsy and who are not suitable for high-altitude work shall not engage in high-altitude work.

Scaffolding construction must have a strict disclosure and acceptance system, without acceptance can not be used, a variety of bamboo ladder must have anti-slip measures, construction is strictly prohibited to dismantle a variety of safety measures, have an impact on the construction rather than demolition can not, to get the consent of the responsible person, and take reinforcement measures. When working at high altitudes, steel bars, and structures, be sure to wear non-slip shoes.

Strict safety electricity consumption system, comply with the "Construction site temporary electricity safety Technical specifications" (JGJ46-88), temporary electricity layout should be reasonable, it is strictly prohibited to pull random connection, wet, basement and pipe shaft construction should use low-voltage lighting. On-site electricity, there must be a special person to manage, at the same time set up a special distribution box, it is strictly prohibited to pick up random pull, adopt the electricity list system, put an end to illegal operations, to prevent the occurrence of personal, line, equipment accidents. All kinds of materials and machines for vertical transportation must be bound, safe and reliable.

Electric drill, electric hammer, electric welding machine and other electric machinery, power distribution box must have leakage protection devices and good grounding protection ground, all electric machinery and cables must be regularly checked to ensure good insulation, the use of electric machinery should wear insulation shoes, wear insulation gloves.

Construction schedule planning and implementation:

 

Under the guidance of the overall construction schedule, the project management department shall prepare the quarterly, monthly and weekly construction operation plan by the project assistant, and the professional construction technical supervisor shall be responsible for informing the construction team and organizing the implementation;

The project department holds weekly progress coordination meetings attended by professional construction technical supervisors and heads of construction teams of each subsystem to check and coordinate the progress of each subsystem project in time and solve problems related to process handover. The company will hold meetings of relevant departments regularly to coordinate the cooperation between departments and project departments on project implementation.

The project manager shall attend the production coordination meeting convened by Party A on time, deal with the construction cooperation problems with relevant construction units in a timely manner, and reflect the problems existing in the construction in a timely manner to ensure the smooth and synchronous progress of the entire project.

Installation engineering construction process sequence

 

The first level, after the trunk, the installation project and civil construction should be closely coordinated, reasonable cross, and carefully do the buried work.

First water and electricity, after wiring, where conditions should be installed in advance, which is to shorten the project period, to ensure the quality of the key.

The first focus, after the general, such as the equipment room of each layer, should be installed in place after the completion of the decoration, and then the end of the work area, and finally the commissioning operation.

Construction schedule: The construction plan shall be carried out under the guidance of Party A, and a regular weekly project meeting system shall be established, mainly responsible for coordinating the intersection of drawings, technology, structure, decoration, electricity, water, heating and other specialties during construction; Understand and supervise the arrival of equipment and materials, labor, and site construction progress and other related issues.

The installation and debugging of integrated wiring equipment shall be carried out in accordance with the general construction technology and construction and acceptance specifications.

Construction method

 

Optical fiber construction principles

 

Because the core material of the optical fiber is quartz glass, it is easy to break, so it is necessary to be especially careful in construction. The following principles shall be followed during construction:

 

When making optical fiber connectors, construction personnel must wear glasses and gloves, and the environment should be kept clean.

It is absolutely not allowed to use the naked eye to see the energized optical fiber and its connector, and it is not allowed to use optical instruments to observe.

You can maintain the optical fiber system only when all light sources are disconnected.

The optical fiber layout should be redundant. The reserved length of the optical cable at the device end is generally 5-10 meters.

The bending radius of the cable should be at least 10 times the outer diameter of the cable at static, and at least 20 times during construction.

The traction of the cable should be less than 80% of the allowable tension of the cable, in addition, when the fiber is subjected to uneven side pressure, the loss of the fiber will be significantly increased.

Cable traction speed is generally 15 meters/min.

When the cable is put through the pipeline (or bridge), the utilization rate of the diameter of the linear pipeline is generally 50%-60%; The pipe diameter utilization rate of bending pipe is generally 40%-50%.

Metal wire tubes, metal hoses, metal Bridges, and distribution frames must be grounded after the whole connection.

Construction operators should strictly follow the process requirements, strictly observe the records, strictly implement the process specifications, and do a good job in civilized construction.

 

Twisted pair construction principles

 

When installing the cable, keep the cable pairs as twisted as possible to minimize the length of the cable sleeve

Avoid the spread and isolation of cable pairs. Maintain cable pairs at the end contacts to avoid entanglement of cable pairs.

The minimum bending radius should be 4 times the cable diameter

The cable should be properly tightened when bundling, and the bundling ring should be able to slide freely on the fixed object. ,

Try to avoid entanglement between cables.

The maximum traction tension of 4 pairs of cables is 110N

On the connection hardware, do not end the cable pair too close to the connection block, and maintain a minimum space of about 6cm.

 

Optical fiber laying

 

The cable laying between buildings is recommended to use pipe laying, which is the best method of outdoor cable laying, because the pipe can protect the cable, moisture, and damage. Direct burying of optical cables is generally discouraged because any future digging can damage the fiber. It is not feasible to lay the cable overhead, because the cable is exposed to the air and will be affected by the harsh weather.

Before pulling the cable, check that the pipe is not blocked.

When the tension exceeds 45kg, a tension gauge is used to monitor the cable.

The pipe is lubricated to reduce friction.

Twisted pair laying

 

When the construction personnel thread the cable, each cable must be marked at both ends and be consistent with the construction drawing.

The 4-wire pairs of cables in a single hanging channel should not exceed 252, and the cables in the channel should not be wound; The contact surface between the suspension device and the cable should be smooth or soft to avoid damage and deformation of the cable cover

Cable troughs must be fully sealed. The cover can be opened by locking. Cable troughs are connected by matching connecting plates and bolts. A cable ring must be punched through the bottom of the cable trough to provide a support for securing cables to avoid damage due to gravity. According to the wiring standard, it is required to punch a row every 600mm height (each row is covered with 4 threading rings). No burrs required.

The vertical slot shall be connected with the horizontal bridge of each floor, and shall be connected with the cable slot of the upper end of the cabinet between the distribution cables of each floor; The bend of the cable trough should be an arc or folded bend to avoid damage caused by too small a bend of the cable.

The contractor is required to be able to ensure the possibility of cable laying in accordance with national standards, remove burrs and garbage in the tube, and leave the guide wire needed to thread the line in the tube.

In order to ensure smooth threading, in the discharge of the wire pipe, it is required to set the wire box at the branch, connection and bend of the pipeline according to the building code.

The connection of the horizontal line slot and the vertical ladder, and the connection of the horizontal line slot and the pipeline should be equipped with the corresponding specifications of the branch accessories, which can not be broken to ensure the bending of the line routing and the safety of the line; If the length of the pipeline is not enough, when the casing needs to be added, the jacket should be added, not the inner sleeve.

After cables are installed, all cable troughs must be closed with locks to prevent rodents. The metal cable troughs must be connected through ground cables.

Pipeline engineering construction

 

Before laying the cable, the model, specification and length in the cable laying table and the cable model, specification, number and length provided by the supplier should be rechecked, the cable division table should be listed, and the construction should be carried out according to the principle of large before small, long before short, to improve the utilization rate of each cable tray and reduce the project cost. The vertical cable laying in the pipe shaft should adopt the method of combining the terminal head traction and the intermediate clamp traction, and carry out strict calculation on the wire rope and the clamp screws of the block, etc., and the cable installation should adopt the way of cable rolling head and single support screw.

The installation of pipe slots for the electromechanical subcontractors shall be constructed in strict accordance with the national norms, and the modification of construction drawings shall be approved by the integrated wiring group.

A long-distance copper wire is led from the underground to the upper floor, and a distribution box equipped with a wire insulation splint is added in the middle.

The electric tube passing through the settlement joint should be equipped with a compensation device, a single electric tube with a metal flexible tube, and a terminal box for a row of electric tubes. UTP passing through the settlement joint of concrete slab should be provided with waterproof sleeve.

The construction method of prefabrication of mechanized model is adopted as far as possible in the embedments of online pipe and channel, which not only ensures the engineering method, but also improves the installation speed, improves the efficiency and saves labor.

During construction, inspection means should be perfected, concealed works should be signed by Party A before backfilling, ash, capping, and detailed records, cables and wires should be tested before installation, and detailed records should be established. Unqualified equipment and materials should not be used in construction.

It is necessary to adhere to the strict technical and quality acceptance system, to do technical disclosure before construction, to check the acceptance assessment signature procedures after construction, and to adhere to the implementation of the "three inspection" system; If there is any change in the project, negotiation shall be conducted before construction. In case of design changes, modifications and additions, Party A shall issue a formal change letter before construction.

For the projects that have been buried by leakage or that it is necessary to modify the design documents during construction, Party A and the designer shall be notified in advance to agree, and the construction shall be carried out after the project negotiation. Unauthorized treatment is absolutely not allowed.

For hidden works, changes in design drawings and construction technical standards, as well as testing and inspection records and other information, must be recorded and marked in detail, and visa procedures, properly kept.

The training work of professional high-tech should be implemented in a planned way, and the combination of going out to study and training should be adopted to solve new technologies and new processes and improve the technical level of installation and construction.

If the finished product is damaged, the supervision company should be notified immediately to obtain on-site evidence, distinguish the responsible person and the amount of compensation, in order not to affect the progress of the project, the wiring project team should be immediately restored.

Several key points and countermeasures in project implementation

 

The coordination of project implementation and civil engineering in time schedule

 

In order to ensure the construction period, the construction of this project will have a good cooperation with civil engineering, mechanical and electrical installation and weak current installation in the time schedule. This system is the "nerve" part of the building, in order to ensure that the system in the construction process in an orderly order to proceed, there are certain laws, we must pay attention to and follow. Based on years of experience in project management and construction, the paper sums up three links that must be paid close attention to in the early stage of project installation and six stages in system engineering construction and civil engineering progress coordination.

 

The three links are:

 

Joint review of system construction drawings

 

Joint review of drawings is an extremely serious and important technical work. It plays an important role in reducing the errors in the construction drawing and ensuring and improving the quality of the project. Before the joint review of the drawings, our project team will provide detailed construction drawings to the construction unit, supervision unit and mechanical and electrical subcontractor. All units should read the construction drawings carefully, get familiar with the content and requirements of the drawings, sort out difficult problems, record the problems in the drawings, and solve them in the design submission and joint review of the drawings.

The joint review of drawings is recommended to be organized and led by the general contractor of the weak current project, and to be participated by the construction unit, supervision company, equipment suppliers of each subsystem, and mechanical and electrical installers in a step-by-step manner, and organized according to the nature of the project and the content of the drawings. The results of the joint audit shall be formed a summary, signed by the design, construction, weak current general contractor, and construction parties, and distributed as a supplementary technical document to the construction drawing.

The schedule of the system construction period

 

The main periods of the schedule include:

 

System design, equipment production and purchase, pipeline construction, equipment acceptance, equipment installation, system debugging, training and system acceptance, etc. At the same time, project construction interface coordination and confirmation should be formed minutes or interface coordination documents.

 

System engineering construction technology disclosure

 

Technical disclosure includes the general contractor of the weak current project, sub-system contractors, mechanical and electrical equipment suppliers and installers, supervision companies, as well as the integrated wiring project team to the construction team to disclose the work, they should be carried out at different levels.

 

What is emphasized here is the technical disclosure work within our integrated wiring project team, with two purposes: First, in order to clarify the characteristics of the construction task undertaken, technical quality requirements, system division, construction technology, construction points and precautions, so as to know well, in order to facilitate the planned, organized more quickly and efficiently complete the task, the project leader can further help technicians understand and digest the drawings. The second is a detailed description of the specific requirements of engineering technology, safety measures, construction procedures, and equipment preparation, so that the responsibility is clear and each has its own responsibility.

 

The main contents of technical disclosure include: the performance and operation of new technologies, new processes, new equipment, and new materials used in construction, and the precautions for embedded parts, and the corresponding records will be made for technical disclosure.

 

The six stages are:

(1) The system reserves holes and embedded wire pipes to cooperate with civil engineering

 

In the underground floor of a building at the initial stage of civil construction, the reservation of system line holes and the pre-burial of system line management such as fire protection and security are involved. Therefore, in the "digging" stage of dealing with the underground part of the building, we will cooperate with the Architectural Design Institute to improve the supplementary design of the construction drawings of the underground floor and the main building of the building, the hole reservation and the pre-burial of wire pipes, so as to ensure the smooth completion of the civil works.

 

(2) The construction of the line trough frame and the cooperation of civil engineering and weak current systems

 

The installation and construction of the system trough frame, after the basic completion of the civil engineering, and the installation of other management channels (air pipes, drainage pipes), can also be slightly later than the installation of the pipeline for a period of time (about 15 working days), but it must be designed to solve the reasonable placement and cooperation between the weak current system trough frame and the pipeline in the position.

 

(3) The coordination of system wiring and room layout with civil construction and decoration works

 

The wiring and threading work of the system shall be carried out simultaneously with the decoration project after the complete completion of the civil engineering, and the installation shall avoid the difficulty of threading after the completion of the decoration project. At the same time, the decoration between the main equipment room and cables should be synchronized with the overall decoration project. After the basic decoration between the main equipment room and cables is complete, locate the cabinet, lead the cables into the cabinet, complete the coding work, and start the cable terminal connection. Pay special attention to the main room and wiring room door lock must be installed!

 

(4) Work area end connection

 

The end connection of the work area panel should start at the basic end of the decoration project, and pay attention to the entry time of the furniture.

 

(5) System acceptance

 

The acceptance of the system, our company believes that should be built on the basis of self-inspection qualified, complete completion information, and according to the requirements of the weak current general package unified arrangement. After the acceptance of the whole system, the equipment commissioning work is carried out.

 

(6) Commissioning of the system

 

The debugging of the integrated wiring system, we basically after the installation of the equipment, that is, the debugging of the system, the cycle takes about 15 days, depending on the progress of the network equipment and the switch in place. Requirements for pipe embedment and cable trough erection

 

The embedment of pipe and the laying of cable trough and bridge need to be carried out simultaneously with civil engineering. Therefore, the design of the system construction drawing should take a step forward in this aspect. When designing the construction drawing of the reserved hole and the embedded wire pipe, the capacity of the line and equipment should be fully considered to meet the maximum demand for future development. At the same time, it should cooperate closely with the architectural design institute, the construction unit and the construction unit to fully understand the specific situation of the civil construction in order to reasonably solve the construction problems in the hidden pipe. Fully understand the distribution, location and technical and technological requirements of other air and water pipelines, so as to avoid conflicts with the scenting arrangement of these pipelines. The buried hidden pipe should try to avoid passing through the settlement and shrinkage joint of the building. If it must pass through the settlement or expansion joint, the wire pipe should be treated accordingly. Embedded hidden pipe is generally used wire pipe or polyvinyl chloride pipe, and steel pipe should be used and well grounded in areas susceptible to heavy pressure and electromagnetic interference. The utilization rate of pipe threading and pipe diameter is generally 40%. When the twisted wire is threaded in the tube, the utilization rate of the section of the tube is generally 20-25%, and when the parallel wire is threaded in the tube, the utilization rate is generally 25-30%. The bending radius of the wire tube shall not be less than 10 times the outer diameter of the cable when placing the cable; Not less than 6 times the outer diameter of the wire when passing through the ordinary wire. Line pipes are mainly used for horizontal lines in buildings, usually for occasions where the distance is not far and the pipeline section is small. Some of the fire and special security requirements of the first load line are generally used through the pipe, according to China's "high-rise civil building design fire code" (GBJ45-82) requirements of the fire system of the distribution road (strong and weak current) should be used through the metal pipe protection, hidden in the structure of the non-combustion body, the protection thickness is not less than 3CM, Protective measures must be taken on metal pipes in the morning. When the wire is threaded through the pipe, if the materials used in the floor (floor) or the bidding part of the roof on the floor are similar, the latter should be preferred. Because the pipe ends and openings located in the top plate of this floor (i.e. the upper floor) are downward, cement mortar will not be poured through the pipe openings when pouring concrete floors, and the top plate is easy to handle when a distribution box is required.

 

The integrated wiring system of this scheme requires a relatively large diameter and cross section of the pipe. If the hidden pipe is embedded in the cast-in-place reinforced concrete floor, it will bring difficulties to the hidden pipe installation and threading. For prefabricated floors, because the floor cushion can not be very thick, coupled with the cross of steel pipes, it is difficult to bury. Because the building uses central air conditioning, in the decoration works are using the suspended ceiling method (false ceiling), so we can use the way of setting the cable trough in the suspended ceiling, this way, is currently very common in foreign countries, the used cable trough and accessories have been completely normalized, and equipped with a variety of turning cable trough, T cable trough and other specifications. It is very convenient to use the channel for wiring construction. Cable troughs are supported by Angle steel brackets. The Angle steel frame is fixed under the floor with expansion bolts. The expansion bolt holes are drilled on site with a hammer drill, and there is no need to reserve embedded parts on the floor. The cable trough is made of galvanized thin steel plate. The specifications commonly used in China are shown in Table 7-1. When wiring, 40% of the cable trough should be reserved.

 

Cable bridge specification sheet

 

 

In the suspended ceiling of the building, in order to meet the requirements of fire prevention, the wire should pass through the protective tube when going out of the wire trough, the wire should not have exposed parts, and the wire trough should be made of fireproof materials, and all weak wire trough should have warning and identification signs or nameplates.

 

The construction design of line pipe and line trough and bridge can be composed of these parts: the buried pipe part outside the wall, the main machine room part, the vertical bridge part, the floor horizontal line slot part, the floor horizontal line pipe part, the floor lead down pipe part, and the bottom box part. When implementing the design, it is necessary to determine the best solution according to the size of the building, the level of the floor, the point analysis and the number. In the electrical installation and construction design of the building weak current system, the routing and quantity of cables, the wiring mode, the layout of the cable trough frame and the control box in the weak current shaft, and the connection and number of the end connection are mainly determined.

 

Distribution construction precautions

 

The rated voltage of the insulated wire through the tube groove frame should not be less than 500 V

 

Pipelining in the pipeline trough frame should be carried out after the plastering and ground works of the building are completed. Before the wiring construction, the water and debris in the pipeline trough should be removed

 

In principle, the wiring of the weak current system can be laid in the same slot separation mode, but the auxiliary power supply circuit with a voltage greater than 65 V should be laid in another tube and another slot, especially the TV signal line, broadcast line and power phase have good shielding and mutual isolation. In order to prevent signal crosstalk and electromagnetic interference, the total cross-sectional area of the wire in the pipeline groove (including the outer protective layer) should not exceed 40% of the cross-sectional area of the pipe groove. When the wire in the vertical or horizontal pipeline exceeds 5M, it should be fixed in the pipeline groove or junction box. After the wire passes through the pipeline groove, soft protective wire covers should be installed at the exit of the wire until the wiring end of the electrical equipment to protect the wire from external damage.

 

Five. Integrated wiring system test acceptance scheme

 

5.1 General cabling acceptance standards

 

The acceptance of integrated cabling shall be in accordance with the Code for Construction and Acceptance of Integrated Cabling System Engineering of Buildings and architectural Groups GB/T50312-2007

 

5.2 Cabling test contents

 

Test content

 

Cabling system test includes:

Horizontal copper link test;

Vertical trunk copper cable link test;

Vertical trunk cable link testing;

End-to-end channel joint testing

After the completion of the system test, organize the relevant technical and management personnel to check and accept the whole system.

Testing instrument

ETL or ETL certification, can reach level 3 and above field acceptance tester, including FLUKE DSP-4300, DTX-1800, OMINER II; IDEAL LANTEK 7; ALIGENT WIRESCOPE350 cable tester.

 

Optical cable testing

 

Connectivity test

Full attenuation and connection head attenuation test

Test instructions for Class 5 unshielded horizontal copper cables

 

The Super Class 5 unshielded horizontal copper cable system is tested by special Super Class 5 unshielded testing instruments.

 

Polarity, continuity, short circuit, break test and length

Signal full attenuation test

Signal near and far crosstalk attenuation test

Structural rotation degrades SRL

Characteristic impedance

Transmission delay

5.3 Project acceptance:

 

When the wiring system is fully installed and the test technical indicators meet the requirements of the Technical Requirements, Party A and multi-party inspectors jointly conduct the final acceptance of the entire project. The acceptance shall be carried out by random inspection, and its contents and procedures shall be determined by both parties through consultation. A random sample of 10% twisted pair connections was tested

 

tester

 

The engineer dispatched by the master and the engineer of the user side jointly complete the test work of the whole system and fill in the test form.

 

Completion report

 

After completing the integrated wiring system of the building, the engineer actively assisted the owner to complete the commissioning of the entire system. And provide the owner with a complete completion report, including the following:

 

As-built drawing

Device configuration diagram of each management area

Device configuration table of each management zone

Jumper list of devices in each management zone

Maintenance records of equipment in each management area

Acceptance report

Maintenance guarantee

Performance guarantee

Integrated cabling system management reference manual

Test report

5.4 After-sales service and training

 

After-sales service

 

We are willing to establish a good cooperative relationship with Party A for the implementation of the project and later maintenance work. We will take your assessment seriously, adjust the project implementation plan immediately, and provide corresponding technical support and later quality assurance system to meet the requirements of users.

 

1. From the date of signing the installation acceptance report, the hardware products will be provided with a one-year free warranty, and the system may be upgraded (only the cost of upgrading). All hardware quality problems in this period by our company to provide free maintenance and service, its response time is within 24 hours, and provide 24-hour hotline service.

 

2, after the warranty period, the company to provide the same quality of service. For the quality problems of the equipment in the contract, its products are replaced free of charge, and for the problems caused by human damage, the company provides paid services according to the actual situation.

 

train

 

After the completion of the project, the technical training of the integrated wiring system is provided, so that users can independently deal with the problems related to wiring and better manage the building intelligently. The training personnel are generally the building control center administrators and the engineers responsible for the implementation of weak current engineering.

 

Training content:

 

※ The structure of the integrated wiring of this project

※ Functions and uses of the main devices used in this project

※ Introduction of integrated wiring logic diagram

※ General cabling layout diagram introduction

※ Introduction to the wiring engineering files

※ Test method of wiring system is introduced

5.5 Quality Assurance

 

System quality assurance for cabling systems, where product quality does not meet these standards within 20 years from the date of installation, will provide for appropriate product and personnel replacement or repair