standalone exchange meaning in Chinese

独立局，独立交换局

We installed standalone exchanges in the press center that were equipped with pstnisdn interfaces to provide such services as international switching , toll switching , local hubbing and local switching . the international switching capacity reached 30 , 000 circuit ports , and the toll switching capacity amounted to 126 , 000 circuit ports
我们专门在新闻中心设立了独立的交换机，采用ＰＳＴＮＩＳＤＮ业务接口，分别提供国际交换、长途交换、本地汇接和本地交换等业务，其中国际交换容量达到３万路端，长途交换达到12