Since such special trunk circuits are only used during that part of a call that requires connection between locations, such trunks are more efficient than normal tie trunk circuits. 然后该中继线路获得释放,可以为其它呼叫提供服务。由于这根特殊的中继线路仅仅在需要在两个商店之间建立呼叫链接时才使用,因此比常规的专用中继线使用效率更好。
Analysis and Discussion on Communications Traffic and Tie Trunk 话务量和中继电路计算取定相关问题分析及探讨