EXFO FTB-635 Wideband Copper and DSL Test Module - Manual (Page 203)

TDR Test
Copper and xDSL Tests 195
Manual TDR
Note: In order to configure Trace 1 as Differential, at least two traces must be
enabled.
Note: If Trace 1 is configured as Differential and no trace is held or loaded, then
Trace 1 will display the normal TDR trace.

Differential Color option opens a color panel which allows you to
differentiate between Trace 2, Trace 3 and Trace 1. If Type is
Normal for Trace 1, its color is black and the color option is
disabled.

Trace 2/3: When enabled the following parameters can be set:

Type allows you to configure each trace as the following:
Hold - using this trace to display static snapshots of the live normal
TDR (regardless of whether Trace 1 is configured as Normal or
Differential) or
Load - displaying traces loaded from a file.

Offset: Each trace has a configurable offset, ranging from -1.00 to
1.00. The offset for Trace 1 (Live) is fixed at 0.00. If three traces are
enabled, all with Offset: 0.0, then all three traces will overlap.

Trace Color option opens a color panel which allows you to
differentiate between all 3 traces.

Prompt When Loading allows you to change TDR parameters to that
of the loaded file, either a Single Trace or Trace Group (multiple
traces) when enabled.

Clear Held/Loaded Traces button clears the parameters set for all
held or loaded traces.