专用综合服务网 meaning in Chinese

pisn

Information technology - telecommunications and information exchange between systems - private integrated services network - part 1 : reference configuration for pisn exchanges technical corrigendum 1
信息技术.系统间电信和信息交换.专用综合服务网.第1部分: pisn交换用参考配置
Information technology - telecommunications and information exchange between systems - broadband private integrated services network - inter - exchange signalling protocol - transit counter additional network feature
信息技术.系统间通信和信息交换.宽带专用综合服务网.互换信令协议.转接计数附加网络特性