Copper, VDSL2, ADSL2+, and IP Triple-Play Test Set
89
7
Fault Location Tests
Fault location tests are used to locate faults in the loop. The AXS-200/635
uses the following types of fault location tests:
³
TDR
³
RFL Single Pair (2 wire)
³
RFL Separate Good Pair (4 wire)
³
Loop Mapper
To view fault location test panes or tabs:
1.
From the
Fault Location
pane use
the up or down arrow key to
highlight the desired test, then
press .
2.
Press the F1, F2, or F3 key to view
available tabs. To view any
available additional tabs, use the
function arrow keys on either side
of the F1 and F3 keys.
TDR Test
The time domain reflectometry (TDR) test allows you to easily locate
bridge taps (multiple appearances), the end of the cable, open ends,
shorted ends, splices, split pairs, and wet sections in a cable. It also allows
you to estimate cable lengths.
A TDR test transmits a fast pulse along the cable, then measures the
resulting reflected pulse as a function of time, and displays the results as a
function of the cable length or time.
