Design of the Integrated Wiring vertical trunk Subsystem

Overview of the design of the trunk Subsystem

The vertical Trunk Line System (also known as the vertical subsystem) consists of the building wiring equipment (BD) and jumper between devices, as well as the thousands of cables connecting devices to various floors, as shown in 9.30.

In the system, the trunk cable should be a short, secure, and economical route. Otherwise, the trunk cable should be laid through a dedicated channel for closed Integrated Wiring with doors. Thousands of cables should be located at the center of the building as much as possible. cables should not be placed in the elevator, water supply, gas supply, heating, and strong electric shaft.

Point-to-point connection is recommended for thousands of cables, and branch-to-branch connection can also be used. If the device room is located in a different location from the computer room and switch room, and the voice cable needs to be connected to the switch room, the data cable needs to be connected to the computer room, select different trunk cable or different parts of trunk cable in the design to meet the voice and data needs respectively. The optical cable system can also be used when necessary.

Select the type of vertical cabling cable based on the building height, purpose, and floor area. You can use the following four types of cables in the trunk subsystem.

(1) 100 Ω large logarithm twisted pair cable.

(2) 15O Ω STP cable.

(3) 62.5 μm/125 μM Multimode Optical Cable.

(4) 8.3 μm/125 μM single-mode optical cable.

In actual engineering design, common cables are 1OO Ω large logarithm UTP (voice signal transmission) and 62.5 μm/125 μM Multimode Optical Cable (data transmission signal ).

To ensure the quality of signal transmission, the cabling distance of the trunk subsystem is limited. The distance between the building distribution frame (BD) and the floor distribution frame (m) should not exceed 500 m, and the distance between the building group distribution frame (CD) and the floor distribution frame (FD) should not exceed 2000 m.

When a single-mode optical cable is used, the maximum distance between the complex distribution frame and the floor distribution frame can be extended to 3000 m. When a five-category pair cable is used, the wiring distance should not exceed 9 om for High-Speed Application Systems with a transmission rate higher than 1 oombps. Otherwise, single-mode or multi-mode optical fiber cables are recommended.

In the complex distribution frame and on the building distribution frame, the length of the connection line and Jumper should not exceed 2Om. The length exceeding 2Om should be deducted from the maximum length of the allowed cable. When a telecommunication device (such as a User Switch) is directly connected to a complex distribution frame or a building distribution frame, the cable length of the device shall not exceed 30 m.

Structure of the trunk Subsystem

Star-shaped topology should be used for the vertical kV sub-system.

If the basic unit of the Integrated Wiring System is used as a node and the line connecting adjacent nodes is used as a link, the star-shaped topology is composed of a central master node (MDF of the main distribution frame between devices) it is formed by extending outward to each slave node (IDF of the floor distribution frame), as shown in Figure 9.31.

Because each line from the center node to the slave node is relatively independent from other lines, the star-shaped topology is a modular design. The master node adopts a centralized access control policy. The control devices of the original master node are complex, but the information processing burden of each slave node is small. The master node can communicate directly with the slave node, but the slave node must be transferred by the central node to communicate with each other.

There are two types of jumpers in the Main Wiring: The main jumper and the internal jumper. The main jumper is carried out on the main distribution frame between devices, and the internal jumper is carried out on the distribution frame of the wiring room. The connection between the two management zones passes through three or less jumpers, and a single jumper must reach the master jumper.

The star-shaped topology has the following main advantages: it is easy to maintain and manage with application control, the independence of each link increases flexibility, the extended modification is simple, and the fault handling process is simplified. The disadvantage is that the dependency on the central primary node is too strong, and the failure of the primary node will invalidate the entire system.