第9题:[简答题]The number of optical fiber cores shall be determined according to the network planning, reliability and service requirements and the structure of the optical cable. The number of reserved fiber should not be less than 50% of the total number of fiber in the new long-distance optical cable. 参考答案:光纤芯数应根据路网规划、可靠性、业 务需求以及光缆结构确定。新建长途光 缆中预留光纤数占该条光缆光纤总数的 比例不宜低于50%。