Cabling: PDS Design

1, work area subsystem design

Key points of design of working area subsystem

An independent area to set up terminal equipment should be divided into a working area, the work area subsystem should be the wiring (horizontal) cabling system of information outlets extended to the workstation terminals at the connection cable and adapter components, The service area of a workspace can be estimated by 5~10m ', each workspace set up a telephone or computer terminal device, or set according to user's requirements. Each information outlet in the workspace should support the setting up and installation of terminals such as telephones, data terminals, computers, television monitors, etc. The work area subsystem includes the office, the writing room, the work room, the technical room and so on needs the telephone. Computer terminals, televisions and other facilities of the area and the corresponding equipment collectively.

The selection of work Ameri adapter should meet the following requirements:

A dedicated cable or adapter can be used when a connector with a different information outlet is used at a device connector
Apply network terminal adapter when opening ISDN service on a single information outlet
When the cable (media) selected in the wiring (horizontal) subsystem is different from the cable (media) required by the device, it is advisable to use the adapter
Adapters should be used when connecting the corresponding devices, such as digital mode conversion or data rate conversion using different signals.
For compatibility with network protocols, use adapter adapters
The corresponding terminal adapters can be equipped according to different telecommunication terminals in the working area

2. Horizontal Subsystem

The horizontal subsystem consists of an information outlet for the workspace, a horizontal cable for each layer of wiring equipment to an information outlet.
The horizontal subsystem should be designed according to the following requirements:

Provide immediate and long-term terminal equipment requirements according to the project
The number and location of information outlets that need to be installed per layer
Details of how the terminal may be moved, modified, and rescheduled in the future
Comparison of the schemes of one-off construction and staged construction
Horizontal subsystems usually use 4 pairs of twisted pair, high-speed applications can choose optical Cable
The horizontal cable length should be within 90m

The information outlet of the integrated wiring system should be selected according to the following principles:

A single connected 8-pin socket is suitable for basic systems
Dual connected 8-core sockets for enhanced systems
Integrated wiring system design can be used in a variety of types of information outlets

3. Trunk Subsystem

The trunk subsystem shall consist of wiring equipment between the equipment and jumper and connecting cables between the equipment and the floor wiring.

Main points of Main line subsystem design

① the principle of sharing the voice and data signals in the cable must be determined before determining the total number of cables required for the trunk subsystem. For the base type, 2 pairs of twisted pairs can be selected for each working area, and 3 pairs of twisted pair can be selected for each workspace for enhanced type. For the integrated type, each workspace can be built on the basis of basic or enhanced cable system. You should choose the shortest, safest and most economical route for the trunk cable. It is advisable to select a closed channel with a door for laying trunk cable. Buildings have two main types of channels: closed and open. Closed access refers to a series of upper and lower junction, each floor has a room, the use of cable shafts, cable holes, pipe cables, cable tray, etc. through the floor of these rooms. There are usually a number of facilities and fire-fighting installations that facilitate the securing of cables in each handover room. An open channel is an open space from the basement of a building to a roof, with no floors in between, such as a ventilation channel or an elevator passage, which cannot be routed through the trunk subsystem.

The ② trunk cable can be used for point to point termination, and it can also adopt a branch descending termination and cable direct connection method. Point-to-Point termination is the simplest and most direct method of engagement, with each trunk cable extending directly to the specified floor and junction. The branch decrement termination is a 1 large trunk cable sufficient to support a number of handover or several floors of communication capacity, through the cable connector protection box to separate a number of small cables, which are extended to each handover or each floor, and End-to-end connected to the destination hardware. Cable direct connection method is a special case of the technology used. One situation is that all horizontal terminals in one floor are concentrated in the trunk exchange, and the other is that the two-level junction is too small to be completed at the junction between the main lines.

③ If the equipment is in a different location from the computer room, and you need to connect the voice cable to the equipment and the data cable to the computer room, it is advisable to select different parts of the line cable or trunk cable to meet the needs of different routing voice and data respectively at design time. When needed, can also be used to meet the optical cable system.

4, equipment between the subsystem

Components of a subsystem between devices

Equipment is set up in the appropriate location of each building to line equipment, network management and management personnel on duty. The subsystem of the equipment should be composed of the building line equipment of the integrated wiring system, the telephone, the data, the computer and so on and the security wiring equipment. The telephone, data, computer mainframe equipment and security wiring equipment among the subsystems of the equipment should be centrally located in one room. If necessary, can be set separately, but the program-controlled switchboard and computer mainframe room away from the equipment is not too far.
The design essentials of the subsystem of the equipment are as follows:

All incoming terminals in the equipment should use color standard to distinguish the wiring area of various uses
Equipment between the location and size should be based on the number of equipment, size, the best network Center and other content, comprehensive consideration to determine

5. Management Subsystem

Management Subsystem Composition

The management subsystem is set up in the room of each layer of wiring equipment. The management subsystem should be composed of wiring equipment, input/output equipment between the handover. can also be applied to subsystems among devices. The management subsystem provides a means of connecting with other subsystems. Handover makes it possible to arrange or rearrange routes, so that the communication lines can continue to connect the building inside the various multiple-interest sockets, so as to achieve the management of integrated wiring system.

Design Essentials of Management Subsystem

① management subsystem should adopt single point management double handover. The structure of the junction field depends on the working area, the scale of the integrated cabling system and the hardware selected. In the management of large-scale, complex, there are two-level handover between the two-point management set up double handover. At the management point, it is advisable to use the tag insertion bar to mark each end of the field according to the application environment. Single point management is located in the vicinity of the switch inside the device, through the line without jumper management, directly connected to the user room or service wiring between the second junction area. Two-point management in addition to the handover room, but also set a second manageable handover. Double handover for passing the two-level handover equipment. The way to achieve line management in each junction area is to connect the cross wiring or plug-in wiring between the colored fields to indicate that the field is a trunk cable, wiring cable or equipment end point. These fields are usually assigned to the specified wiring blocks, and the wiring blocks are arranged vertically or horizontally.

The ② Junction area should have a good marking system, such as building name, building location, area code, starting point and function. The integrated wiring system uses three kinds of tags: cable markers, field markers, and insertion marks. Where insertion marks are most commonly used. These markings are usually hard paper or otherwise, and are used by the installer when needed.

③ between the handover and the two-level handover between the line equipment should be used to distinguish between the various uses of the wiring area.

The choice of connection mode of ④ handover equipment should conform to the following regulations:

When the line on the floor is less modified, shifted or regroup, it is advisable to use the clamp wiring method
Plug wiring is used when you need to reorganize lines frequently
⑤ space should be left between the junction fields to accommodate future expansion of the handover hardware.