User's Manual

Chapter 16 Test Results
Copper results
SmartClass TPS User’s Guide
May 2014 22035456, Rev 001 139
Longitudinal balance
You measure longitudinal balance to:
– measure the quality of the pair: a measurement of the degree to which the Tip (A) lead is elec-
trically the same as the Ring (B) lead.
The more each lead is electrically identical (capacitance, inductance, impedance), the better the
pair will resist induced noise.
The balance result should be >60 dB. Anything less indicates electrical differences between Tip (A)
and Ring (B) that can lead to noise and other signal problems.
Table 50 describes the DC current result.
Good Ground check
The good ground check is a ground resistance measurement. It tests whether the ground used for
longitudinal balance is acceptable. The result should be <35dB.
Load coil
You check for load coils to ensure there are no load coils present on a digital line (such as ADSL or
ISDN). Load coil detection and elimination is essential in the installation of an xDSL circuit
Table 49 describes the load coil result.
Table 50 Balance result specifications
Range Resolution Accuracy
35 to 70 dB 1 dB 2 dB
Table 51 Load coil result specifications
Range Resolution Accuracy
Up to 27,000 ft (8229.6 m) up to 5 ± 1