POTS Testing and Fault Location
Terminated VF Tests
4
4-67
Results from a typical Loop Test are shown in Figure 4-32:
elf43s.bmp
Figure 4-32. DATU EXP Loop Test Results
Terminated VF Tests
Terminated VF Tests are a group of double-ended, voice frequency Auto-Tests
that require a far-end terminating device such as the Fluke Networks TN2100
Terminator or TN2200 Terminator II; 3M FED
™
or FEDII
™
; or CMC My
Helper
™
. The tester automatically controls the Terminator, FED
™
and Helper
™
over the same pair. Therefore, a separate control pair is not required.
During the Auto-Tests, the tester first runs a sequence of single-ended
parametric tests. It then conducts a series of terminated VF transmission tests
to effectively qualify the pair for voice frequency POTS service. The following
individual tests are conducted:
• AC & DC Voltage
• Shorts & Grounds
• Opens
• Load Coils
• VF Noise
• VF Longitudinal Balance
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