本标准为交换运营商的终端办公室和交换运营商之间的双向数字或数字等效传输路径提供了性能规范。这套规范将为交换语音和声带数据电话服务提供优质的端到端性能。本标准定义了与模拟性能相关的传输参数，并规定了限制。以前称为T1。506-1997（R2006）。

This standard provides performance specifications for the two-way digital or digital equivalent transmission path between the exchange carrier's end office and an interexchange carrier's point of termination. This set of specifications will enable the provision of quality end-to-end performance for switched voice and voiceband data telephone services. This standard defines analog performance-related transmission parameters and specifies limits. Formerly known as T1.506-1997(R2006).