What are the reference methods for calculating the number of cables for weak wiring?
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What are the reference methods for calculating the number of cables for weak wiring projects? How is the basic estimate calculated? What is the method of accurate calculation?
First, the calculation of auxiliary materials
1. The number of statistical information points, including each room and computer room, is filled in the point distribution table;
2. Determine if it is too long? If it is too long, where should I set up the sub-wiring room, a few? If there is a sub-wiring room, the number of switches will also change accordingly.
3. Determine the direction of the route;
4. Determine the model and length of the bridges. Calculation method: (length × width) × 0.4 / 28, the result is the number of information points, commonly used standard bridge: 300 × 100, 200 × 100, 100 × 100, 100 × 50, 50 × 50, other bridges need to be customized.
Note: If the branch route has the same bridge model, calculate its length separately, and finally calculate the total length of the bridge model.
5, ø25 and ø20 tube calculation (usually ø25 can be laid 6 lines, ø20 can be 4 lines). When calculating, based on ø20, the average information point needs to be ø20 from the bridge to the terminal. If it is A, then it can calculate the length of all information points that need ø20, that is, B=A×(total points/4 ), and actually in the project, ø20 = 2 / 3 × B, ø25 = 1/3 × B.
6. Calculation of angle steel (30×30). The length of the angle steel = 30cm × (the total length of the bridge m / 1.5m), that is, the average length of each angle steel is 30cm, an angle steel is required every 1.5m distance.
7. Calculation of keel (75×45). The length of the keel = 70 cm × (total points / 2), that is, each keel has a length of 70 cm and is usually arranged as a double-port panel.
8, the calculation of keel clips, pipe joints, box joints, rivets, steel saw blades and other accessories. = total auxiliary material price × 10%
9, the calculation of the bottom box (86 × 86). Number of bottom boxes = total points / 2
Second, the calculation of equipment materials
1. Calculation of cable:
(farthest + most recent) / 2 × points × 1.1 / 305
Description:
The farthest point is from the machine room to the information point;
Recently, the information point in the computer room is generally 20 meters;
The number of points is the information point covered from the beginning of the equipment room. If there is a sub-wiring room, the number of points is the number of information points covered by the route from the sub-wiring room, and 0.1 of 1.1 is the margin, that is, 10%. 305 is 305 meters in length per box.
If there are sub-wiring rooms, they should be calculated separately and the formula is consistent. That is: the number of cables required to cover the information points in the central equipment room + the number of cables required to cover the information points in the sub-wiring area + the number of cables required to connect the sub-wiring rooms to the central equipment room.
Another point to note is that the number of network cables is generally around 300 meters, less than 305 meters. If the number of cables in this project is relatively large, this is also considered. For example, the length of the cable reserved at the end of the threading device should also be considered comprehensively. This will also be judged according to the overall construction process of your construction team.
2. Calculation of the module. The number of information points;
3, the number of dual port panels: total points / 2;
4. Calculation of 48-port patch panels. Total number of points / 48, if there are sub-wiring rooms should be calculated separately, that is, the number of information points covered by each / 48, and then added, 4U;
5. Calculation of the line manager. The 48-port patch panel does not require a line manager (included), mainly for the switch. If there is a sub-wiring room, it should be calculated separately. 1U;
6. Cabinet jumper (2m). Jump from the patch panel to the jumper of the switch + the cascade between the switches.
7, the jumper of the workstation. The total number of points;
8, RJ45 head. (Cabinet jumper + workstation jumper) × 2 × 1.1;
9, RJ45 head sheath. The number of heads for RJ45;
10. The number of three major logarithms. The distance from the weak well through the bridge to the machine room + rich (larger, because the large logarithm can not be connected);
11, 110DW2-100FT patch panel (2U). One is 100 pairs;
12, 110 through the line slot. Consistent with the number of 110 patch panels;
13, 110 back plate (4U). For: 110DW2-100FT distribution frame number / 2;
14, 110C4 connection block (10 per package). The 110DW2-100FT patch panel is 100 pairs. It consists of four parts, each part is 25 pairs, which consists of 5 C4 connection blocks and 1 C5 connection block (5×4+1×5=25), that is It is said that 100 pairs of large logarithms require 20 C4 connection blocks and 4 C5 connection blocks.
15, 110C5 connection block (10 per package). GR;
16, dian words jumper (disk / 100 meters). Each dian jumper takes 1.5 meters.
17, RJ11 head. The number of dian words is determined. For example, 200 dian words (200 pairs of large logarithms) require 200 RJ11 heads (the other end is directly on the RJ11 patch panel);
18, dian phone cabinet (200 times). Determined according to the number of points in dian;
19. Cabinet (42U, 24U). Calculate the height (U) of the 48-port patch panel, line manager, RJ11 patch panel, switch, server, etc.
Third, the configuration of the fiber
Description: There is a central computer room on the second floor, and there is a sub-wiring room. There are also one sub-wiring room for each of the 4th and 7th floors, and 6-core indoor multimode fiber is placed in each of the three sub-wiring rooms.
Mold connection: fiber consumables and ST multimode fiber optic connectors are required;
Fusion mode: Single-chip multimode ST pigtails are required, no fiber consumables and ST multimode fiber connectors are required.
Fourth, how to calculate the number of cables more accurately
First, the number of cables to be calculated should be calculated according to the construction drawing. Our dry engineering is constructed according to the drawings, and the drawing accounting is the basic of the entire project budget. When the construction drawings are obtained, it is generally necessary to follow the drawing of the bridges according to the drawings. Is it in line with the design of the drawings, and the direction of the bridges is determined, and the main lines are basically determined.
The other is to calculate the cable drawn from the bridge. The cables from the bridge are generally used for pipe. There are two ways to do the pipe: one type of line pipe lifting and one type of roofing.
The calculation of hoisting construction cables and pipes is relatively simple. It is calculated according to the drawings. Reserve 30cm-100cm at the last equipment end to see your final installation equipment and equipment location. It is necessary to look at the installation of cables and pipes along the roof. Is it necessary to cross the beam? This cannot be calculated according to the drawings. The number of cables and pipes should be calculated by considering the conditions of the site construction.
There is also the calculation of the vertical part and the horizontal part, especially in the calculation of the cable in the weak electric well, first depends on the floor height, and the distance from the installation position of the weak electric well equipment to the bridge, comprehensive consideration, comprehensive calculation.
In short, the number of cables is calculated, based in part on the drawings, part of the site, part of the experience, and part of the construction team.

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