990DSL
Users Guide
6-4
TDR Auto-Test
The TDR Auto-Test is an automatic test. With the press of a single key, this
Auto-Test runs a sequence of parametric tests and a TDR test. Results from a
TDR Auto-Test can give you a quick— yet comprehensive— view of the
status of a pair. For the novice or infrequent operator of TDR equipment, the
TDR Auto-Test can provide a good starting point in the troubleshooting
process.
The TDR Auto-Test automatically flags and pinpoints the location of the
following types of faults:
• Open conductors
• Resistance shorts
• Load coils
• Bridged taps
• Bad splice joints
• Terminations
Even though the individual TDR tests (described later in this chapter) can be
performed on working pairs with voltage, the TDR Auto-Test should be run on
non-working pairs only. This is because several of its integrated parametric
tests (for example, Opens and Shorts & Grounds) are accurate only when there
are moderate amounts of voltage on the line.
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