本标准旨在规定同步光网络（SONET）信号的复用格式和基本开销定义。ATIS-0900105.2008系列中的其他标准通过提供有关SONET的其他特定方面的详细信息，以本基础文件为基础。

The purpose of this standard is to specify the multiplexing format and basic overhead definitions for the Synchronous Optical Network (SONET) signal. Other standards in the ATIS-0900105.2008 series build upon this base document by providing additional detailed information about other, specific aspects of SONET.