光纤通道为上层协议（ULP）提供了通用数据传输工具，如智能外围接口（IPI）和小型计算机系统接口（SCSI）命令集、高性能并行接口（HIPPI）数据帧、IP（互联网协议）、ANSI/IEEE 802.2等。ISO/IEC 14165的这一部分描述了通道和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。 该协议缩写为FC-SB-2，旨在与ANSI X3一起使用。230、FC-PH及其后续增强功能，其中指定了光纤通道物理和信令接口。FC-SB-2是许多光纤通道协议映射之一，称为FC-4s。读者应熟悉FC-PH、单字节命令代码集连接（SBCON）体系结构（ANSI X3.296-1997）。

Fibre Channel provides a general data transport vehicle for Upper Level Protocols (ULPs) such as Intelligent Peripheral Interface (IPI) and Small Computer System Interface (SCSI) command sets, the High-Performance Parallel Interface (HIPPI) data framing, IP (Internet Protocol), ANSI/IEEE 802.2, and others. This part of ISO/IEC 14165 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 signalling 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 protocol, abbreviated FC-SB-2, is intended for use with ANSI X3.230, FC-PH and its subsequent enhancements which specify the Fibre Channel Physical and Signalling Interface. FC-SB-2 is one of a number of Fibre Channel protocol mappings, referred to as FC-4s. The reader should be familiar with FC-PH, Single-Byte Command Code Sets Connection (SBCON) Architecture (ANSI X3.296-1997).