Black Box BRTS-100 manual Speaker, Two Test Set units used for tracing

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CHAPTER 5: Technical Reference

5.5 Speaker

The incoming frequency to the speaker is divided by eight. Since ISDN signals are transmitted at 96 KHz, it has to be reduced in order to be heard over the speaker.

When the Test Set is in TRACE TONE mode, the incoming frequency to the speaker is divided by four. So a TRACE tone received by the Test Set will be heard at 1 KHz. See Figure 5-9.

BRTS-100

4

1KHz

REC.

4KHz

TRANS.

TRANS.

4KHz

REC.

BRTS-100

1KHz

4

Figure 5-9. Two Test Set units used for tracing.

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Contents BRTS-100 Isdn Test Set FCC Statement BRTS-100 Isdn Test SET NOM Statement Trademarks Used in this Manual Contents Specifications How to Use This Manual IntroductionOverview Features 100 EstConnecting the Unit OperationBRTS-100 Isdn Test Set controls and indicators Passive BUS Powering Up the Unit Controls and Indicators Feature ButtonsIndicators Modes of Operation Test Status PASS/FAIL Lights Reflects test statusTest Procedures Test Configuration 1 Point-to-Point NT1 FigureTest Procedures Comprehensive Troubleshooting Procedure Comprehensive troubleshooting flow chart 1 Comprehensive troubleshooting flow chart 2 Check Power Phantom Conclusion LightCheck Power Check LoopTest Procedures Check loop flow chart 1 Check loop flow chart 2 Check loop flow chart 3 Test Procedures Passive Bus Configuration Check Terminations Passive Bus-Check TerminationsTest Procedures Proper device terminations diagram Pair Reversal Pair reversal flow chart 1 Pair reversal flow chart 2 10. Pair reversal diagram Monitor 11. Monitor flow chart Power-Source Indicators Technical ReferenceActivation/deactivation procedure Activation/Deactivation ModesLine Test/Transmit See Figure Receive TestLevel Test Transmit and line test AC Impedance DC ContinuityAC impedance Speaker Two Test Set units used for tracingAppendix Maintenance Battery ReplacementPin Jack Replacement Figure A-2. Replacing the 8-Pin Jack ConnectorsCopyright 2002. Black Box Corporation. All rights reserved