OOB(Out of Band) Signaling
For both SAS and SATA, the hardware initialization process begins with OOB signaling. Pronounced either as letters or as a funny-sounding syllable, OOB can be misleading because the term might be understood to mean that a dedicated signal is used rather than the normal data path. However, the SAS OOB signals do travel within the normal data path. The reason they are called OOB is because the signaling takes place before the receiver has been prepared to recognize dwords and so it is not part of the normal transmission process. Let's consider what is involved in the process of OOB communication.

翻译：OOB（带外）信令

对于SAS和SATA，硬件初始化过程从OOB信号开始。OOB发音为字母或听起来很有趣的音节，可能会产生误导，因为这个词可能被理解为使用专用信号而不是正常的数据路径。然而，SAS OOB信号确实在正常数据路径内传播。它们被称为OOB的原因是，信令发生在接收器准备识别数据字之前，因此它不是正常传输过程的一部分。让我们考虑一下OOB通信过程中涉及到什么。

解释:

SAS这个OOB与BMC的带外管理，实际是不一样的。它使用相同的物理路径。BMC的OOB使用独立的路径。