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Premises Distributed System (PDS) is an integrated universal transmission system that uses twisted pair or fiber optic cable to transmit information over buildings and campuses. It can connect devices such as telephones, computers, conference TVs, and surveillance TVs. Structured information transmission system.
The cabling system uses standard twisted pair and fiber optics to support high-speed data transmission. This system uses a physical layered star topology, modular, modular design, and follows a unified standard, making centralized management of the system possible, and also causing failures, changes, additions or deletions of each information point without affecting other information points. It makes installation, maintenance, upgrades, and expansion easy and saves money.
The integrated wiring system can be divided into six independent systems (modules), as shown in the figure:
Work area subsystem
The work area subsystem consists of devices connected between the terminal devices and the information outlets. Includes: information outlets, outlet boxes, connection jumpers, and adapters.
2. Horizontal zone subsystem
The horizontal zone subsystem shall consist of information outlets for the work area, horizontal distribution line equipment to horizontal sockets for information outlets, floor wiring equipment and jumpers. In general, horizontal cables should use 4 pairs of twisted pair cables. Where horizontal subsystems have high-rate applications, fiber optic cables, fiber to the desktop, should be used.
According to the requirements of the entire integrated wiring system, the horizontal subsystem should be connected in the secondary handover room, the handover room or the wiring device between the devices to form a telephone, data, television system and monitoring system, and is conveniently managed.
3. Management subsystem
The management subsystem is located in the room of the floor distribution line device. The management subsystem should be composed of wiring devices, input/output devices, etc. in the handover room, and can also be applied to the inter-device subsystem. The management subsystem should adopt a single point of management for dual handover. The structure of the transfer field depends on the work area, the size of the cabling system, and the hardware chosen. When the management scale is large, complicated, and there is a level 2 handover, double-point management double handover is set. At the management point, each termination field should be marked with a marker insertion strip depending on the application environment.
4. Vertical trunk subsystem
Usually the main equipment room (such as computer room, program-controlled switch room) provides the most important copper or fiber-optic trunk line in the building, which is the information transportation hub of the whole building. Generally, it provides multiple connection paths between equipment rooms and wiring frames on different floors, and can also connect large areas of single floors.
5. Equipment room subsystem
Equipment rooms are places where incoming equipment is installed at appropriate locations in each building for network management and management staff. The equipment room subsystem shall be composed of the building line equipment, telephone, data, computer and other host equipment and its security wiring equipment of the integrated wiring system.
6. Building group subsystem
The building complex subsystem extends the cables of one building to the communications equipment and facilities of other buildings within the complex. It includes copper wire, fiber optics, and protection equipment that prevents surge voltages from cables from other buildings from entering the building.
Common integrated wiring design standards mainly include the following:
Commercial Building Telecommunications Cabling Standard (CSA Works T529 in Canada)
Commercial Building Standard for Telecommunications Channels and Space (CSA T530)
Residential and N-type commercial telecommunications cabling standard CSA T525
Management Standard for Commercial Building Telecommunications Infrastructure (CSA T528)
Commercial Building Grounding/Connection Requirements (CSA T527)
Token Ring Network Access Method and Physical Layer Specification
"Code for Design of Integrated Wiring System for Buildings and Buildings"
"Construction and Building Group Integrated Cabling System Engineering Acceptance Specification"
"Code for Design and Acceptance of Integrated Cabling Systems for Buildings and Buildings"
In the integrated wiring equipment, in addition to the most important transmission medium, such as twisted pair, fiber optic cable, etc., there are many wiring devices in use. Commonly used are RJ45 plugs, information sockets, patch panels, fiber optic connectors, wire strippers, wire cutters, cable clamps, network cable modules, etc.
(1) RJ45 plug
(2) Stripping pliers: Stripping pliers are an essential tool in making thin cables. Their main function is to peel off the two layers of insulation outside the thin cable wires.
(3) Wire cutter: The information socket and the module are nested together. The network cable buried in the wall is connected with the external network cable through the information module. The connection between the internal network cable and the information module is through the 8 wires of the network cable. The core wire is snapped into the corresponding slot of the information module. The cable entry requires a special card line tool, called "wire cutter". The first and second images are the two single-wire wire cutters of Simon, and the third one is Simon. Many pairs of money tools. Multi-pair wire tools are commonly used for the installation of patch fabric wire cores.
(4) Cable Clamp: The cable clamp is used to clamp the BNC connector casing and base. It has a hexagonal notch for the crimping line as shown. Generally, such crimping tools also have the functions of stripping and trimming.
(5) Information socket: The information socket is generally installed on the wall surface, and also has a desktop type and a ground type, mainly for facilitating the movement of the computer and the like, and maintaining the beauty of the entire wiring.
(6) Patch panel: The patch panel is the most important component in the management subsystem, and is the hub for the cross-connection of two subsystems, vertical trunk and horizontal cabling. Patch panels are usually mounted in cabinets or walls. By installing accessories, the patch panel can meet the needs of UTP, STP, coaxial cable, fiber optics, audio and video. Patch panels commonly used in network engineering include twisted pair patch panels and fiber patch panels.
The function of the twisted pair distribution frame is to cross-connect the twisted pairs in the management subsystem for use between the main wiring closet and each distribution line. There are many models of twisted pair patch panels, each manufacturer has its own product line, and there are different specifications and models for 3, 5, 5, 6 and 7 cables, respectively. In the product manual, refer to the product manual and configure it according to the actual situation.
The role of the fiber distribution frame is to connect the fiber optic cable in the management subsystem, usually between the main wiring closet and each distribution line.
(7) Fiber optic connector: A fiber optic connector is a device that is detachably (active) connected between an optical fiber and an optical fiber. It precisely pairs the two end faces of the optical fiber so that the optical energy output from the transmitting optical fiber can be maximized. Coupling into the receiving fiber and minimizing the impact on the system due to its involvement in the optical link is a fundamental requirement for fiber optic connectors. To some extent, fiber optic connectors also affect the reliability and performance of optical transmission systems.
Optical fiber connectors can be divided into common single-mode and multi-mode connectors of silicon-based fibers according to different transmission media, and other optical media connectors such as plastics for transmission media; according to the structure of the connector, it can be divided into: FC , SC, ST, LC, D4, DIN, MU, MT, etc.; among them, ST connectors are usually used for wiring equipment terminals, such as fiber distribution frames, fiber modules, etc.; SC and MT connectors are used for network equipment. More ends. According to the shape of the end face of the fiber, there are FC, PC (including SPC or UPC) and APC type; according to the number of fiber cores, there are also single-core, multi-core (such as MT-RJ) type fiber optic connectors. Fiber optic connectors are used in a wide variety of applications.