JDS Uniphase SmartClass - Copper Test Problems

Chapter 18 Maintenance and Troubleshooting
Resolving problems
SmartClass TPS User’s Guide
June 2014 22035456, Rev 001 155
Copper test problems
The following section addresses questions about Copper testing.
Issue
The Tip (A) - Ring (B) voltage is reading negative.
Resolution
The Tip (A) and Ring (B) test leads may be swapped. Check your test leads to verify that they are
hooked up properly.
Issue
The AC voltage test result from Tip (A) to Ground (E) is 5 volts and from Ring (B) to Ground (E) is
15 volts.
Resolution
Either Tip (A) is open or Ring (B) is longer. This will also be indicated by noise on the loop. Results
on Tip (A) to Ring (B) should be 0.0 volts. Tip (A) to Ground (E) and Ring (B) to Ground (E) should
be equal to each other. Anything else indicates AC signal interference and/or an unbalanced line.
Ringer voltage level can be checked by having the CO ring back on the line. Results should be
either 85 volts (older switches) or 105 volts (newer switches).
Issue
The DC volt measurement on Tip (A) to Ground (E) is 15 volts with the battery removed.
Resolution
This indicates there may be an open in the insulation drawing current from another pair.
To measure DC volts, remove the line battery and measure Tip (A) and Ring (B) to Ground (E). It
should be < 3.0 volts; anything else indicates crossed battery that inhibits digital signals.
To check for span/battery voltage, measure Tip (A) to Ring (B) across several pairs. On good lines
Tip (A) to Ring (B) will be 48–52 volts, Tip (A) to Ground (E) will be < 5 volts, and Ring (B) to Ground
(E) will be -48–52 volts.
Issue
In the winter, the DC current measured 21 mA from an aerial cable at the NID with are no problems.
In the summer, the same line measured 17 mA.
Resolution
The heat has increased resistance and lowered the current.
DC current on Tip (A) to Ring (B) should be  23 mA at the NID. Anything less will not allow for differ-
ences in temperature and phone equipment will not operate during extremes.
The 23 mA threshold covers most temperature extremes.
Issue
The resistance measurement on Tip (A) to Ring (B) is 3.5 M, Ring (B) to Ground (E) is 3.5 M,
and Tip (A) to Ground (E) is 5 k.