信息技术 系统间远程通信和信息交换 专用综合业务网 作为要求时PINX间一对连接使用电路方式基本服务和辅助服务用户到用户信令的映射功能

[中文适用范围]： 本国际标准规定了同时使用公共 ISDN 的电路模式基本服务和补充服务用户到用户信令（服务 3）的一对按需 PINX 间连接的映射功能。 为了将专用综合业务网络交换机 (PINX) 连接到另一个 PINX，需要映射功能来使 C 参考点处的特定接口适应 Q 参考点处的应用。 因此，映射函数提供对 C 参考点处的接口的物理适应。 映射功能还提供将Q参考点处的用户信道和信令信息映射到C参考点处的适当信道或时隙。 C 和 Q 参考点在 ISO/IEC 11579-1 中定义。 在 Q 参考点，映射为用户信道提供 64 kbit/s 服务，为信令信道提供分组模式服务。 除了在 Q 参考点为信令信道提供第 2 层之外，承载调节不属于本国际标准的范围。 情景管理不属于本国际标准的范围。 本国际标准适用于可以互连形成专用综合服务网络（PISN）并支持 Q 参考点信令协议的 PINX。 [外文原描述]： This International Standard specifies the mapping functions for a pair of on-demand inter-PINX connections using a circuit mode basic service and the supplementary service User-to-User Signalling (service 3) of a public ISDN at the same time. In order to connect a Private Integrated Services Network Exchange (PINX) to another PINX, mapping functions are required to adapt the specific interfaces at the C reference point to the application at the Q reference point. As such, mapping functions provide for physical adaptation to the interface at the C reference point. Mapping functions also provide for the mapping of user channels and signalling information at the Q reference point to the appropriate channels or timeslots at the C reference point. The C and Q reference points are defined in ISO/IEC 11579-1. At the Q reference point the mappings provide a 64 kbit/s service for user channels and a packet mode service for the signalling channel. Bearer conditioning is outside the scope of this International Standard, except for providing the layer 2 for the signalling channel at the Q reference point. Scenario management is outside the scope of this International Standard. This International Standard is applicable to PINXs which can be interconnected to form a Private Integrated Services Network (PISN) and which support signalling protocols at the Q reference point.