CHAPTER 4: Test Procedures
With the Check Loop procedure, first check to see if the transmit pairs (pins 3 and 6) and the receive pairs (pins 4 and 5) are reversed.
1.Put the Test Set in REVerse mode; LINE button should be in.
2.Put circuit in the
3.Put the Test Set in the LINE TEST test mode.
4.Press the INITIATE button.
5.a. If the Green Test Status light goes on, the Loop is reversed.
b. If the Red Test Status light goes on, the Loop is wired properly.
Now, try to isolate the problem between the Transmit Pair and the Receive Pairs.
1.Put the Test Set back in NORMal mode by pressing the LINE button.
2.Put the Test Set in the RECEIVE test mode.
3.a. If the Red Test Status light goes on, there is a problem with the receive pair. Skip steps four and five and got to step nine.
b.If the Green Test Status light goes on, the receive pair is good and there’s a problem with the transmit pair.
4.Put the Test Set in the CONTINUITY test mode.
5.a. If the Red Test Status light goes on, there is an open in the TX pair. There’s no need to do any further testing.
b.If the Green Test Status light goes on, got to step six.
6.The problem could be that there is a short on the transmit pair. Put the Test Set back in the NORMal mode by pushing the LINE button (LINE should be out).
7.Put the Test Set in the IMPEDANCE test mode.
8.a. If the Red Test Status light goes on, either the NT1 is not terminated or there’s a short in the TX pair. There’s no need to do any further testing.
b.If the Green Test Status light goes on, there’s no problem with the NT1 and no further testing is required.
9.Perhaps the problem is that there’s no continuity on the RX pair between the terminal and the NT1. Put the Test Set in REVerse mode by pressing the LINE button (LINE button should be in).
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