4)初期工程各小区及出局光缆芯数构思设计:根据3)的构思设计,每小区以300户为基础,配2对纤芯,每8对纤芯备用2对纤芯,以此汇总计算出主干纤芯数,并可再加30%的备用数,作出局纤芯数。各小区进区小芯数光缆也可给予30%的备用,如600户的小区,可采用6芯光缆进入,但接续时可用4芯。5) 4) The initial project of the district and the number of outgoing fiber core design: According to 3) the concept of design, each district to 300 households, with two pairs of cores, each pair of fiber core pairs of spare 2 pairs of cores, in order to calculate Out of the main fiber core number, and can be combined with 30% of the standby, make the number of core fiber. Each district into the area small core fiber optic cable can also be given 30% of the spare, such as 600 households in the district, 6-core fiber optic cable can be used to enter, but the connection can be used when the 4-core. 5)