綜合佈線知識：星型布線計算法

详情描述：

星型布線指所有的樓層分支分配器集中在弱電間內，從每個用戶終端(插座)獨立敷設一根射頻電纜到相應的弱電間與分支分配器聯接。
水平部分電纜(通常為RG6)，線纜用量計算方法：
電纜平均長度=(zui遠用戶終端水平距離 zui近用戶終端水平距離)/2 2H(H——樓層高度)
實際電纜平均長度=電纜平均長度?1.1 (端接容限，通常取3)
電纜需要總數=用戶終端總數x實際電纜平均長度 (米)
註：zui遠、zui近用戶終端水平距離是從樓層分配箱到zui遠、zui近終端用戶插座的實際距離，包含水平實際路由的距離，若是多層設置一個樓層分配箱則還應包含相應樓層高度。
主幹電纜(通常為RG11/RG9)，線纜用量計算方法：
電纜平均長度=(zui遠樓層分配箱距離 zui近樓層分配箱距離)/2
實際電纜平均長度=電纜平均長度?1.1 (端接容限，通常取6)
電纜需要總數=樓層分配間總數x實際電纜平均長度 (米)
註：zui遠、zui近樓層分配箱距離是從樓層分配箱到衛星或有線電視中心機房(或延續放大器)的實際距離，主要取決於樓層高度和弱電井到有線電視中心機房的水平距離。
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Comprehensive wiring knowledge: star wiring calculation method
Star wiring means that all the floor branch distributors are concentrated in 
the weak current room, and a radio frequency cable is independently laid from 
each user terminal (socket) to the corresponding weak current room to connect 
with the branch distributor.
The horizontal part of the cable (usually RG6), the calculation method of 
cable usage:
Average cable length = (horizontal distance of the farthest user terminal   
horizontal distance of the nearest user terminal)/2 2H (H——floor height)
Actual average cable length = average cable length ? 1.1  (termination 
tolerance, usually 3)
Total number of cables required = total number of user terminals x actual 
average cable length (m)
Note: The horizontal distance of the farthest and nearest user terminal is 
the actual distance from the floor distribution box to the farthest and nearest 
terminal user socket, including the distance of the horizontal actual routing. 
If a floor distribution box is set up in multiple floors, the corresponding 
floor height should also be included.
Backbone cable (usually RG11/RG9), cable usage calculation method:
Average cable length = (distance of distribution box on the farthest floor   
distance of distribution box on the nearest floor)/2
Actual average cable length = average cable length ? 1.1  (termination 
tolerance, usually 6)
Total number of cables required = total number of floor distribution rooms x 
actual average cable length (m)
Note: The distance between the furthest and nearest floor distribution box is 
the actual distance from the floor distribution box to the satellite or cable TV 
center computer room (or continuous amplifier), which mainly depends on the 
floor height and the horizontal distance from the weak current well to the cable 
TV center computer room.
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