How to quickly and accurately calculate the cabling usage
The type of cable should be determined according to the application system included in the integrated cabling system. For computer networks and telephone voice systems, 4 pairs of twisted pair cables can be preferentially selected. For high shielding requirements, 4 pairs of shielded twisted pairs can be selected; for non-high shielding requirements, 4 pairs of unshielded twisted pairs should be selected as much as possible. Cables. For cable TV systems, 75Ω coaxial cable should be selected. For applications requiring high transmission speeds or high confidentiality, optical cables should be selected as horizontal cabling.
Determine the length of the cable
To calculate the amount of horizontal wiring for the entire building, first calculate the amount of wire used for each floor, and then summarize the amount of wire used for each floor. The formula for the amount of line used for each floor is as follows:
C=[0.55(F+N)+6]×M
Among them, C is the line quantity for each floor, F is the distance between the farthest information outlets from the floor management, N is the distance between the nearest information outlets from the floor management, and M is the number of information outlets per floor, 6 For end-to-end tolerance (mainly taking into account the loss of cable during construction, cable layout length error and other factors).
The total line usage of the entire building: S=ΣMC, M is the number of floors, and C is the amount of line used for each floor.
Application example: It is known that a building has 6 floors and 20 information points per floor. The farthest information outlet of each floor is 60 meters away from the floor management room. The nearest information outlet of each floor is away from the floor management room. The distances are all 10 meters. Please estimate the total line usage for the entire building.
Answer: According to the topic requirements know:
Number of floors M=20
The distance between the farthest information socket and the management room is F=60m
Nearest point information outlet distance from the management room N = 10m
Therefore, the amount of line used for each floor C=[0.55(60+10)+6]×20=890m
The entire building has a total of 6 floors, so the total line usage for the entire building is S=890×6=5340m.
Order cable
Twisted-pair cables currently on the market are generally ordered in box units. The common packing form is: 305m (1000ft) WETOTE package form. Therefore, in the horizontal subsystem design, after calculating the total quantity of all horizontal cables, it should be converted into the number of boxes, and then order the cable. The formula for ordering the number of cable boxes should be as follows:
Order cable box number = INT (total line volume / 305), INT () for the rounding function.
For example, if it is known that the total building line usage is 5340m, then the number of cable boxes ordered is:
INT(5340/305)=INT(17.5)=18(box)
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