User Manual
SUPM1
page 54 of 94© KEYMILE December 2015 EN/LZTBU 372 129/1 RC
94
Functional Description
Figure 15: Test adapter
− a-wire and ground
− b-wire and ground
• Foreign Voltage
Tests the subscriber lines for foreign AC or DC voltages:
− foreign DC voltage between a-wire and b-wire
− foreign DC voltage between a-wire and ground
− foreign DC voltage between b-wire and ground
− foreign AC voltage between a-wire and b-wire
− foreign AC voltage between a-wire and ground
− foreign AC voltage between b-wire and ground
• Noise
Tests the subscriber line for the presence of noise with frequencies in the
audible range of 300 Hz … 3400 Hz.
• Capacitance
Tests the capacitance between
− a-wire and b-wire
− a-wire and ground
− b-wire and ground
The test area selection is configured in the SUPM1 unit configuration, on the
“Line Test Parameters” tab. The test area selection is valid for cyclic and
manual line-tests.
The “Line Test Time-Out” parameter in the SUPM1 unit configuration, on the
“Line Test Parameters” tab, limits the maximum time a line-test (including the
test for any postponed subscribers lines) may last.
The timer starts at the beginning of a line-test. After this timer expires the
line-test is stopped. Any not-tested lines (due to their off-hook state) remain
untested.
5.11.3 Line-test Alarm Thresholds
The alarm thresholds of most line-test parameters can be configured in the
SUPM1 unit configuration, on the “Line Test Alarm Thresholds” tab.
For the part “Resistance/Isolation” an alarm “Line Fault” (LNF) is generated if
the measured line value is below the configured thresholds.
For the parts “Foreign DC Voltage”, “Foreign AC Voltage” and “Noise” the
alarm “Line Fault” (LNF) is generated if the measured value exceeds the
configured values.
The alarm thresholds can also be set to “Not Used”, then no alarm will be
generated.
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