ITU-T I.351-2004
ISDN、IP网络和物理层性能建议之间的关系-I系列综合数字网络服务-总网络方面及功能-行为目标
Relationships Among ISDN IP-based network and physical layer performance recommendations Series I: Integrated Services Digital Network - Overall Network Aspects and Functions - Performance Objectives Also Listed as G.820 and Y.1501