GB/T 17535-1998
信息技术 系统间远程通信和信息交换在S和T参考点上定位的ISDN基本接入接口用的接口连接器和接触件分配
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
GBT17535-1998, GB17535-1998