本文件与SCTE 85-4 2009相同，但可能已更新的信息性组件除外，如标题页、通知文本、页眉和页脚。本文件未作任何规范性修改。本文档提供了头端（或室内）中HMS光开关设备的MIB定义，并由SNMP代理支持。

This document is identical to SCTE 85-4 2009 except for informative components which may have been updated such as the title page, NOTICE text, headers and footers. No normative changes have been made to this document.This document provides MIB definitions for HMS optical switch equipment present in the headend (or indoor) and is supported by a SNMP agent.