MANUAL TEST FUNCTIONS
47
Classify Pairs
When planning to test a telephone line, it is important to be able to identify the balanced pair
combinations. The TALAN provides some test functions that will assist in identifying which pair
combinations are the balanced pairs. This is very useful because for many testing functions it is sufficient
to only test the balanced pairs and to save time by NOT testing all of the odd pair combinations.
To classify the appropriate balanced pairs, press the F3 (Manual) button at the bottom of the screen and
select Classify Pairs.
To Run the pair classification test:
1. Ensure that the phone is disconnected and that the TALAN is only connected to the line that
goes to the switch.
2. Press the START button.
This test is a line impedance test that measures the coupling between balanced line pairs. The pair
combinations with the strongest bar graphs should be balanced pairs. In the example below, the
balanced pairs are clearly 1:2, 3:6, 4:5, and 7:8.
After reviewing the balanced line data, you should manually define the combinations of balanced pairs
by selecting them in the Define Connections dashboard. Tap the connector numbers that make up the
pair and select Add to define the pair as a balanced pair. Once the balanced pairs have been defined, all
other test screens will display the balanced pairs with a yellow background.
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