Information technology - telecommunications and information exchange between systems - interface connector and contact assignments for isdn primary rate access connector located at reference points s and t 信息技术.电信和系统间信息交换.位于参照点s和t的isdn一次群速率接入的接口连接器及触电排列
Information technology . telecommunications and information exchange between systems . interface connector and contact assignments for isdn basic access interface located at reference points s and t . european standard en 28877 信息技术.系统间通信和信息交换.位于基点s和t上综合服务网络isdn基本存取接口用接口连接器和触点分配