信息技术.光纤信道.第122部分:仲裁环路-2(FC-AL-2)

[中文适用范围]： ISO/IEC 14165 的这一部分指定了 FC-PH 的信令接口增强功能，以允许 L_Port 与仲裁环路拓扑一起运行。 该标准定义了保留 FC-PH 中指定的端口功能的 L_Port。 仲裁环路拓扑将多个通信点连接在一个环路中，无需交换机。 仲裁环路拓扑是一种分布式拓扑，其中每个 L_Port 包括建立环路电路所需的最少功能。 连接到仲裁环路的单个 FL_Port 允许多个 NL_Port 连接到 Fabric。 当 L_Port 与至少一个其他 L_Port 一起在环路上运行时，L_Port 使用本标准中指定的 FC-PH 协议扩展。 当L_Port与N_Port或F_Port连接时，L_Port使用FC-PH中定义的协议进行通信。 每个L_Port可以使用自我发现过程来找到正确的操作模式，而不需要外部控制。 [外文原描述]： 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 international standard, FC-AL-2, specifies an enhancement to the signaling protocol of the Fibre Channel Physical and Signalling Interface (FC-PH), ISO/IEC 14165-111, to support communication among two or more Ports without using the Fabric topology. It defines L_Ports that retain the functionality of Ports as specified in FC-PH. The Arbitrated Loop topology attaches multiple communicating points in a loop without requiring switches; it is a distributed topology where each L_Port includes the minimum necessary function to establish a Loop circuit. A single FL_Port connected to an Arbitrated Loop allows multiple NL_Ports to attach to a Fabric. Each L_Port may use a self-discovering procedure to find the correct operating mode without the need for external controls.