本标准描述了通道和I/O控制单元之间的通信接口，这些控制单元使用在各种数据处理系统中实现的单字节命令代码集（SBCC）。它采用了信息格式和信令协议，为与各种类型的I/O控制单元进行通信提供了统一的方式，促进了高带宽、高性能和远程信息交换环境。信令协议和信息交换在一层（FC-4）上定义，以兼容地利用INCITS光纤通道成帧和信令（FC-4）提供的链路服务和其他功能- FS-4）和INCITS光纤通道链路服务（FC-LS-3）规范。此FC-4上层协议称为光纤通道单字节6命令代码集映射协议（FC-SB-6）。 本标准修改了FC-SB-5标准，规定了对命令模式和传输模式协议的增强和澄清，以提高效率和扩展作战能力。

This standard describes a communication interface between a channel and I/O control units that utilize the Single-Byte Command Code Sets (SBCCS) as implemented in a wide range of data processing systems. It employs information formats and signaling protocols that provide a uniform means for communicating with various types of I/O control units, facilitating a high bandwidth, high performance, and long distance information exchange environment. The signaling protocols and information exchanges are defined at a layer (FC-4) to compatibly utilize the link services and other functions provided by the INCITS Fibre Channel Framing and Signaling (FC-FS-4) and the INCITS Fibre Channel Link Services (FC-LS-3) specifications. This FC-4 Upper Level Protocol is referred to as the Fibre Channel-Single-Byte-6 Command Code Sets Mapping Protocol (FC-SB-6). This standard modifies the FC-SB-5 standard to specify enhancements and clarifications to the command-mode and transport-mode protocols to increase the efficiency and expand the capabilities of operations.