中心站与交换机的主配线架相连，并提供所有接口。
Central station connects MDF of exchangers and provides all interfaces.
移动业务交换中心-基站系统（MSC-BSS）接口；
Mobile-services Switching Centre - Base Station System (MSC - BSS) interface;
移动业务交换中心-基站系统（MSC-BSS）接口；
Mobile-services Switching Centre - Base Station System (MSC - BSS) interface;
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