IEC 60728-7-3:2009规定了混合纤维同轴电缆（HFC）外部设备（OSP）电源（PS）的要求。本标准是为支持HFC电缆网络的互操作管理系统的设计和实施而开发的一系列标准的一部分。这些标准的目的是支持为发展中的氢氟碳化合物电缆网络设计和实施可互操作的管理系统。电源到转发器接口总线（PSTIB）规范描述了物理（PHY）接口以及在7- 层ISO-OSI参考模型，支持兼容转发器与被管理的OSP电源和与其接口的其他相关电源设备之间的通信。它构成了一个技术修订版，包括与前一版本相比的以下重大技术更改:第二版中考虑了从标准ANSI/SCTE 25-3 v1.0到标准ANSI/SCTE.25-3 v1.1（2005）的所有更改。第7条基于标准ANSI/SCTE 110（2005）。增加了关于混合管理子层的信息性附录A。

IEC 60728-7-3:2009 specifies requirements for the Hybrid Fibre Coax (HFC) Outside Plant (OSP) Power Supplies (PS). This standard is part of a series developed to support the design and implementation of interoperable management systems for evolving HFC cable networks. The purpose of the standards is to support the design and implementation of interoperable management systems for evolving HFC cable networks. The Power Supply to Transponder Interface Bus (PSTIB) specification describes the physical (PHY) interface and related messaging and protocols implemented at the Data Link Layer (DLL), layers 1 and 2 respectively in the 7-layer ISO-OSI reference model, that support communications between compliant transponders and the managed OSP power supplies and other related power equipment to which they interface. It constitutes a technical revision and includes the following significant technical changes with respect to the previous edition: All changes from standard ANSI/SCTE 25-3 v1.0 to standard ANSI/SCTE 25-3 v1.1 (2005) have been taken into account in this second edition. Clause 7 is based on standard ANSI/SCTE 110 (2005). Addition of informative Annex A concerning hybrid management sub-layer.