FOX61x, FOX515, and FOX512 provide a pattern generator on the control unit. The pattern generator can be cross-connected to any PDH unit in the FOX51x or to TDM units with PDH signals in FOX61x. This allows diagnostics on transmission links connected to the given NE.

In the FOXCST GUI connected to an FOX61x the TDM diagnostics function with a pattern generator and analyzer is accessed under the “TDM Services - Diagnostics” tab and provides settings and status display for bit error and delay measurements based on different patterns. The sample dialog below shows the setup of the pattern generator for an FOX61x.