3 Copper tests
ARGUS Copper Test Manual
57
Stub line
The beginning of a stub line appears in the
form of a negative reflection, followed by a
positive reflection corresponding to the
length of the stub line when the end of the
stub line is open.
Loading coils
Loading coils deployed on the line are
optimally designed for transmitting voice
frequencies. They do not let DSL signals
through. The TDR function enables you to
detect the first coil in a line. The reflection
is positive with a long tail in the direction of
the end of the line. The following faults
cannot be detected.
Capacitive network
Like a short-circuit, the reflection from a
capacitive network is negative.
Moisture
Moisture penetrating the cable has the
same effect on the reflection as a stub
line. However, the zone between the
negative and positive reflection appears
significantly noisier than for a normal stub
line.
