ISO/IEC 9314的这一部分定义了通过FDDI节点的路径中PHY功能的一致性测试。图1是FDDI路径的功能框图。该路径包含通过FDDI节点重复（即解码和重传）帧的必要功能。 当重复路径中存在MAC时，PHY重复过滤器是可选的。如果重复路径中没有MAC，则该功能在PHY中实现。本测试标准不对路径上是否存在MAC进行假设，旨在使用或不使用MAC进行操作。无论其位于何处，它都会测试重复过滤功能。然而，如果存在MAC，某些测试的结果可能会略有不同。

This part of ISO/IEC 9314 defines a conformance test of the PHY functions in a path through an FDDI node. Figure 1 is a functional block diagram of an FDDI path. The path contains the necessary functions to repeat (that is decode and retransmit) frames through an FDDI node. The PHY Repeat Filter is optional when there is a MAC in the repeat path. If there is no MAC in the repeat path, then the function is implemented in PHY. This test standard makes no assumption about the presence or absence of MAC on the path and is intended to operate with or without a MAC. It tests the repeat filter function wherever it is located. However, the results of some tests may be slightly different if a MAC is present.