Viavi OneExpert DSL ONX-580, User Manual

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Chapter 15 Test Results
OneExpert DSL User's Guide
22052280, Rev. 015 April 2019 270
Opens/Capacitance
You measure opens/capacitance to:
• Measure total electrical loop length (includes length of bridged taps).
• Find wet sections, bridged taps or open faults.
Opens/Capacitance: < 3% difference between Tip (A) and Ring (B) values indicate an
acceptably balanced loop. Anything greater indicates an unbalanced line or open fault,
which inhibit digital signals.
The following table describes the opens/capacitance result (no ambient).
DC current
You measure DC current to verify if enough current is present to operate equipment
including the phone or caller ID boxes.
DC current on Tip (A) to Ring (B) should be ≥ 23 mA at the NID. Anything less will not allow
for differences in temperature and phone equipment will not operate during extremes.
The following table describes the DC current result.
Range
(ft)
Resolution
(ft)
Range
(meters)
Resolution
(meters)
Range
(capac-
itance)
Accuracy
(applies to
capacitance
only)
0 to
2,999
1 foot 0 to 999 0.1 meter 0 to 47.1 nF 1% ± 15 pF
3000 to
66000
1 foot
1,000 to
20,000
0.1 meter
47.1 nF to
1.57 μF
2%
Range Resolution Accuracy
0 to 110 mA 1mA 2% ± 1mA