专线通信技术特点是通信稳定性好，但需铺设专用通信线路，存在施工量大、综合成本高、维护费用高、旧城区施工难度大等问题。
However, the exorbitant cost of laying special lines and maintenance, great workload and difficulty in construction prevent it from popularization.
专线通信技术特点是通信稳定性好，但需铺设专用通信线路，存在施工量大、综合成本高、维护费用高、旧城区施工难度大等问题。
However, the exorbitant cost of laying special lines and maintenance, great workload and difficulty in construction prevent it from popularization.
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