IEC 60728-7-1:2003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工厂和前端控制设备上所有符合类型2和类型3的OSP HMS转发器必须实现的PHY层要求。如有必要，本标准的任何例外情况将在本文中特别注明。 有关类型分类的完整定义，请参阅表1。该双语版本（2012-08）对应于2003-10年出版的单语英语版本。

IEC 60728-7-1:2003 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 bilingual version (2012-08) corresponds to the monolingual English version, published in 2003-10.