IEC 60728-7-1:20 03+A1:2015规定了混合光纤同轴电缆（HFC）厂外（OSP）物理（PHY）层规范的要求，是SCTE下的混合管理子层（HMS）小组委员会制定的一系列规范的一部分。它描述了HFC设备上所有符合类型2和类型3的OSP HMS应答器和前端控制设备必须实现的PHY层要求。如有必要，本文将特别注明符合本标准的任何例外情况。有关类型分类的完整定义，请参见表1。 本合并版本由第一版（2003年）组成 及其修正案1（2015）。因此，无须在 本出版物的补充。

IEC 60728-7-1:2003+A1:2015 specifies requirements for The Hybrid Fibre Coax (HFC) Outside Plant (OSP) Physical (PHY) Layer Specification and is part of the series of specifications developed by the Hybrid Management Sub-Layer (HMS) subcommittee under the SCTE. It describes the PHY layer requirements that must be implemented by all Type 2 and Type 3 compliant OSP HMS transponders on the HFC plant and the controlling equipment in the head-end. Any exceptions to compliance with this standard will be specifically noted herein as necessary. Refer to Table 1 for a full definition of the type classifications. This consolidated version consists of the first edition (2003) and its amendment 1 (2015). Therefore, no need to order amendment in addition to this publication.