ISO/IEC 11579的本部分规定了专用集成电路延长线的参考配置（RC） 服务网络交换（PINX），包括物理终端系统之外的高级功能 ISO/IEC 11579第1部分规定。 因为这样的高级函数似乎依赖于应用程序，原则上可以以任何多样性和多样性出现 组合，没有明确的功能分组分配，因此没有明确的参考点。相反 结合与物理终端系统相关的功能分组和分配的原则 ISO/IEC 11579的本部分规定了参考点。 中给出了一些功能分组组合和参考点分配的示例 附件A。 该原则的目的不是要求PINX的任何具体实现，而是为用户提供指导 PINX功能规范。 该原理足以支持类似ISDN的应用。它还可以扩展到支持非ISDN类型 应用。

This part of ISO/IEC 11579 specifies a reference configuration (RC) for the extension line of a private integrated services network exchange (PINX) including high level functions in addition to the physical termination system specified in part 1 of ISO/IEC 11579. Since such high level functions appear application dependent and can occur, in principle, in any multiplicity and combination, no firm allocation of functional groupings and thus no firm reference points can be indicated. Instead, the principles for combining functional groupings associated with the physical termination system and allocating reference points are specified in this part of ISO/IEC 11579. Examples for some combinations of functional groupings and the allocation of reference points are given in annex A. The principle is not intended to require any specific implementation of a PINX, but only to provide guidance for the specification of PINX capabilities. The principle is sufficient to support ISDN-like applications. It can be extended to also support non-ISDN-like applications.