Black Box BRTS-100 manual Comprehensive Troubleshooting Procedure

BRTS-100 ISDN TEST SET

4.2 Comprehensive Troubleshooting Procedure

This troubleshooting guide is for the user who is either installing a new line and wants to verify the S/T interface, or has a problem with an in-service ISDN terminal. It is a comprehensive procedure which uses virtually all

of the Test Set’s testing capabilities and features.

This Procedure uses other test procedures outlined in this section.

If you identify a problem at any point in this procedure, stop the test and fix the problem. Then repeat the procedure from the beginning. See the comprehensive flow chart, Figure 4-4, for an outline of the operations performed in this test.

1.Put the circuit in the Point-to-Point Test Configuration (Configuration

1). If you’re installing a passive bus, start at the port closest to the NT1.

2.Power up the Test Set.

3.Perform the CHECK POWER test procedure (see page 14).

4.Make sure that the Test Set is in NORMal mode; the LINE button should be out.

5.Put the Test Set in the LINE TEST test mode.

6.Press the INITIATE button.

7.a. If the Red Test Status Light lights up, perform the CHECK LOOP test procedure (see page 15).

b.If the Red Test Status Light flashes, the problem could be jitter in the NT1 or noise on the line. Check the NT1. There’s no need for any further testing.

c.If the Green Test Status Lamp lights up, continue on to step eight.

8.Put the circuit into its normal operating configuration. (Connect all terminals to the S/T interface.)

9.a. If the terminal works, there is no need to proceed any further.

b.If the terminal does not work, proceed to step 10.

10.a. If the circuit is point-to-point, skip steps 11 through 16, and go to step 17.

b.If the circuit is a passive bus, proceed to step 11.

11.The problem may be that all devices on the passive bus are not properly terminated. Verify this by performing the CHECK TERMINATIONS test procedure (see page 19).

16