DIN EN 301776:2001 宽带专业综合服务网(B-PISN).局间信号令协议.独立的承载电路控制(SBC)
Broadband Private Integrated Services Networks (B-PISNs) - Inter-exchange signalling protocol - Separated Bearer Control (SBC) (Endorsement of the English version EN 301776 V 1.1.1 (2000-08) as German Standard)