DTE/DCE接口备份控制操作是指在DTE（数据终端设备）和DCE（数据通信设备）之间的接口上，当主控设备（通常是DTE）发生故障时，备份设备（通常是DCE）能够接管控制并继续正常工作的过程。这种备份控制操作对于保证系统的可靠性和稳定性非常重要。

ISO/IEC 8480:1995标准规定了在ITU-T建议V.24交换电路上进行DTE/DCE接口备份控制操作的方法和过程。该标准主要包括以下内容：

1. 定义了DTE/DCE接口备份控制操作的术语和定义。

2. 规定了DTE/DCE接口备份控制操作的基本原则和要求。

3. 描述了DTE/DCE接口备份控制操作的过程和步骤。

4. 给出了DTE/DCE接口备份控制操作的示例。

5. 给出了DTE/DCE接口备份控制操作的测试方法和要求。

该标准的实施可以提高系统的可靠性和稳定性，保证系统在主控设备故障时能够及时切换到备份设备，从而避免系统的中断和数据的丢失。

相关标准
ISO/IEC 11518:1994 Information technology -- Telecommunications and information exchange between systems -- End system to Intermediate system routeing exchange protocol for use in conjunction with the protocol for providing the connectionless-mode network service (ISO 8473)
ISO/IEC 11519:1994 Information technology -- Telecommunications and information exchange between systems -- End system to Intermediate system routeing exchange protocol for use in conjunction with the protocol for providing the connection-mode network service (ISO 8208)
ISO/IEC 11520:1994 Information technology -- Telecommunications and information exchange between systems -- Intermediate system to Intermediate system routeing exchange protocol for use in conjunction with the protocol for providing the connectionless-mode network service (ISO 8473)
ISO/IEC 11521:1994 Information technology -- Telecommunications and information exchange between systems -- Intermediate system to Intermediate system routeing exchange protocol for use in conjunction with the protocol for providing the connection-mode network service (ISO 8208)
ISO/IEC 11522:1994 Information technology -- Telecommunications and information exchange between systems -- End system to Intermediate system routeing exchange protocol for use in conjunction with the protocol for providing the OSI connectionless-mode network service (ISO 10747)