A, structured cabling system

1. Preface

In today's society, information has become a very critical resources, it must be accurately and quickly transmission in various communication equipment, data processing equipment and display devices in between. For this reason, companies, enterprises, government departments will require the fastest communication and information system for these adjustment and improvement, and according to the needs of different structure configured.

And at home, since would be in some new design of buildings, often is still using the past those wiring technology, causing the wiring can't compatible systems, difficult to adapt to the development of new technology, and the pipeline, and crowded the investment is often on the wiring repeated. This kind of circumstance, can you still as companies and enterprises, government departments expanded, new equipment and personnel changes, office environment of change, and are getting worse and worse. Any add, change, all may cause global change, not only influence the employee's work efficiency, to a company, enterprise, government operation also produce undesirable effects. Especially with ISDN (integrated services digital network) appeared, application and promotion, originally used wiring system will be unable to meet the requirements。

Therefore, seek a more reasonable and more optimization, elasticity, stability and expansibility good wiring technology, has become a top priority. It can not only satisfy the demand now, more important is to meet the challenge of wiring system in the future。

Structured cabling system is introduced in this context and widely received a wiring technology, it could take a one-off wiring investment, solve future quite a period of time inside of all wiring problems。

In recent years, the rapid development of information processing system of information transmission, fast, convenient and safety and stability of high reliability requirements. In the new office building, built in network requirements internally adapt different network equipment, host, terminal, PC and external equipment, can form flexible topology, have enough system extension ability, with countries with foreign through external sources are linked together, lo-fi composed of multi channel information comprehensive access to system. In short, both must adapt to the needs of current information processing, and fully considering information system the future trend of development。

Such structured cabling system will have the following characteristics:

Practicality: after carrying out building automation system and its all subsystems lines of communication and interface can meet international standards. Good user interface, and network management perfect function and easy to use。

Flexibility: system of any part of the connections are flexible, namely from physical connection to the data communication, voice communication, intelligent control equipment by the connection between the little or not by physical location and the equipment types of restrictions。

Modular: all the adapter thing to be used in connection with equipment is block's standard, do not need to master a lot about these areas of expertise that can connect these devices。

Scalability: because the system all the infrastructure (materials, components, communications equipment) are using international standards, accordingly, no matter the computer equipment, communications equipment, intelligent control equipment with the technological development, in the future could easily will its connection to building automation system。

Reliability: various parts in the system are with the use of high quality materials, group parts and carefully construction equipment realized, so that the system and testing, each link is reliable。

2. Structured cabling background:

(1) life cycle comparison

Software: 18 months

PC microcomputer: 2 years

Host: 10 years

Wiring system: 16 years

Building: 50 years

Visible wiring system life cycle is the only building was comparable with the life。

(2) network investment

Wiring system can support and is almost all network devices operate based, and cost about a total investment accounts for only 5% of the network。

(3) within the building staff movement

Increase, mobile and change is inevitable. Every year 40 percent of employees would involve office mobile. If you do not use structured cabling system will influence the work efficiency. Structured cabling system can make increase, moving and changing rapidly and effectively。

(4) network fault loss

Network fault loss every hour on the $1,000 to $50,000. And the annual average happen 20 times the network breakdown, 70% of them caused by wiring system. A stable and reliable wiring system is of vital importance。

3. Structured cabling system characteristics and advantages:

(1) the structured cabling system characteristics

A) systematic engineering - structured cabling is a complete system engineering, including the transmission media (twisted-pair cable (copper) and the optical fiber), connection hardware (including jumper wire rack, modularization socket, adapter, tools, etc) and installation, maintenance management and engineering services。

B) modular structure - structured cabling system design makes with minimal additional wiring and change (if needed) can achieve system with reinstall move, expansion。

C) independent from the application layer protocol CCITT seven -- as in the bottom, structured cabling system physical constitutes a basic link, like a connection information channel within the same building of or outdoor low-pressure electrical and electronic devices. The information provided transmission path of sensor information and comprehensive data ability。

D) flexible convenience - structured cabling system design and compatible with voice and data communications applications. Thus reduced the demand for traditional pipe, and provides a structural design to achieve and management system。

E) technology advanced - structured cabling system allows users to likely adopt various feasible new technology. This is because the structured cabling system independent of applications, and for future application provides considerable redundant。

(2) the structured cabling system advantage

A) economic: use structured cabling system with initial installation cost means to reduce the whole building permanent operating costs, thus make good long-term economic benefits。

B) efficiency: growing building operation cost is all sorts of building management system's main concerns. Install structured cabling systems can reduce the cost. This is because the structured cabling system for the efficiency of the needs of users to react quickly becomes possible, and spend less。

C) facilitate reinstall: structured cabling system not only can be installed in new buildings, and can be used to replace the existing building network updates. If choose the structured cabling system, so now and in the future, it can provide the environment for building the compatible support completely

D) low operating cost: use structured cabling system engineering construction of modular and flexibility can greatly reduce running costs. Structured cabling system is a kind of save the operation cost of the system, the operation cost including buildings or buildings the increase of personnel and equipment with relocated, as well as the changing needs of the occupied aspects brings the spending。

E) wiring system is the whole information system basis: if information system is the soul of intelligent building, then wiring system is equivalent to information system's nerves. Therefore, it can be said that wiring technology choice and wiring system design to determine the whole building the vitality of the information system, it will be related to building the next three decades even five years of use effect。

4. Structured cabling system composition

According to the U.S. national standardization committee electrical appliance industry association (TIA) / electronic industry association (EIA) made commercial building wiring standards, namely the EIA/TIA SCTS and other relevant standards and 569, structured cabling system is mainly aimed at telephone, fax and computer networks that voice and data applications, the future development will also include TV conference, fax, voice mail, satellite communications, etc relatively new communications technologies. The standard for the following respects formulated relevant specification:

Defines the recognition of the media

Defines the topological structure of cabling system

The provisions of the subsystems of the wiring distance

Defines the wiring system and user equipment interface

Defines the cable and connection hardware performance

Provisions needed cautions the installation of the practice

Defines link performance

Wiring system composed by the following seven sub-systems:

Level subsystems

Level subsystems exists in level pick (HC) and jump between sockets.

Level jump after - - - - - - - - - - - level cable - socket

Level for ScTP UTP cable, optical fiber,

Main subsystem

Main subsystem into inside the building and building, inside the building backbone is between between devices to be used in connection with between floors telecom wiring system. And the floor to be used in connection with two buildings between the backbone. It includes:

- major jump connect (MC)

- middle jump after (IC)

-- inside the building backbone cable

Between main cable - floor

For the main cable, fiber optic ScTP UTP,

Workspace subsystem

Workspace subsystem is the area to the user terminals sockets. Put all the media interface (DB15 DB9, DB25, coaxial, etc) standard, modular socket (T568A into T568B) or fiber socket。

Between devices

Between devices used in service in the whole wiring system. Equipment used to accommodate wiring system between the equipment and distribution frames.

Telecom room:

Telecom service between the space is in floor. Used to accommodate the floors of equipment and distribution frames.

Entrance facilities

Entrance facilities are external telephone lines, floor, between the main cable entry point of antenna, etc.

Management subsystem

For the convenience of future changes, add, maintenance, must to the wiring system cable, connection hardware, space, aisle unified management, etc. Wiring system management from EIA/TIA 606 criterion。

5. Components choice

Component selection mainly include:

Information socket: single, double hole information socket, international standards, RJ45 interface

Transmission medium: level - all adopt the five categories 4 to UTP configuration

The backbone of five kinds of 25 - using UTP configuration, and the optical fiber

Wiring unit: TongXin module type twisted-pair link units control-cabinet, indoor optical fiber

Jumper: module type high-performance connection jumpers

Second, floor between wiring

Shanghai institute of foreign wiring main into building with the inner building cabling between wiring two parts. Floor fiber connection between wiring will through the main buildings on campus, including comprehensive building, building complex podium, 1 floor, 3 floor, 12 building, an administrative building, office and library. Among them the administration building and building complex by 12 core between fiber connection; 1 floor and interconnected system run through the four core fiber connection to the administration building, library and the administration building use existing 4 core between fiber connection, through the optical fiber docking, number one floor, after an office, and the administration building through the optical fiber is connected directly to the comprehensive building; 12 floor and 3 floor through four cores fiber is connected directly to the comprehensive building。

Floor room wiring as shown. Among them the administration building and building complex between the 12 core multimode fiber, other adopts four core multi-mode fiber connection。

Third, the inner building wiring

Inside the building cabling mainly includes comprehensive building and the skirt building, 12th floor, 3 floor, 1 floor and the administration building inside the building wiring. Concrete design is as follows:

Building complex includes total 12 floors, according to the actual information points each floor, can every three floors use a telecom and set level between control-cabinet and main distribution frames (can share a distribution frames). Entrance facilities are located in the ground floor, optical fiber connected directly to 12 floor between the main telecom equipment and network center (between). Its structure pursues as follows:

Among them according to the actual demand between devices from the ground floor can be moved to the network center located in 12 layer。

Other each building with the situation of both building, including 1 floor similar needs only a level distribution frames and main distribution frames, test run and library only need a backbone distribution frames, the administration building, 3 floor and 12th floor in addition to also need entry equipment outside, still need between main distribution frames, every two floors, and also used a level distribution frames between the equipment placed network equipment。