信息技术 系统间远程通信和信息交换 专用综合业务网 使用带有16 kbit/s子复用的64 kbit/s电路方式连接的映射功能

[中文适用范围]： 该国际标准定义了专用综合业务网络 (PISN) 交换中的映射功能，这些功能是使用 64 kbit/s 电路模式连接被子复用为 4 × 16 kbit/s 通道以承载 PINX 间信令的场景所需的。 和用户信息。 注 1 – 本国际标准的制定是为了满足特定用户组织的应用的特定需求。 然而，它也可能适用于其他地方。 本国际标准中包含的要求将被纳入任何未来的标准中，指定更通用的承载调节方法。 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。 本国际标准涵盖的 C 参考点的接口类型是 64 kbit/s 无限制数字租用线路 (D64U) 终端设备接口，符合 ITU-T Rec. G.703。 在 Q 参考点处，映射为用户信道提供 16 kbit/s 服务，以支持无限制数字信息的传输并支持语音传输，并为信令信道提供分组模式服务。 所应用的映射是静态映射，即Q参考点处的用户和信令信道与C参考点处的接口之间存在固定关系。 与故障管理相关的管理功能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 defines the mapping functions in exchanges of Private Integrated Services Networks (PISNs) required for the utilization of scenarios in which 64 kbit/s circuit mode connections are sub-multiplexed into 4 x 16 kbit/s channels for carrying inter-PINX signalling and user information. NOTE 1 - This International Standard has been prepared to meet the specific needs of an application for a particular user organisation. However, it may also be applicable elsewhere. The requirements contained in this International Standard will be incorporated in any future standard specifying a more generic approach to bearer conditioning. 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. The type of interface at the C reference point covered by this International Standard is the 64 kbit/s Unrestricted Digital Leased Line (D64U) Terminal Equipment Interface, in accordance with ITU-T Rec. G.703. At the Q reference point the mapping provides a 16 kbit/s service for user channels to support the transfer of unrestricted digital information and to support the transfer of speech, and a packet mode service for the signalling channel. The applied mapping is a static mapping, i.e. there is a fixed relationship between user and signalling channels at the Q reference point and the interface at the C reference point. Management functions relating to failure management are outside the scope of this International Standard. This International Standard is applicable to PINXs that can be interconnected to form a Private Integrated Services Network (PISN) and that support signalling protocols at the Q reference point.