When testing through a bridged tap, it can be difficult to
determine if the reflection caused by a fault is located in
the lateral or in the main cable section
beyond
the
bridged tap point, as illustrated in Figure 2. The fault
could be in either the lateral or the main cable.
Figure 2
Figure 3 is a waveform from the cable plant layout in
Figure 1a. The reflection caused by a fault is obviously
located in the main cable beyond the point of the
bridged tap and
not
the lateral. It is always a good idea
to go to the bridged tap point and test both the lateral and
the main cable beyond the point of bridged tap.
Figure 3