Black Box BRTS-100 Passive Bus-Check Terminations, Passive Bus Configuration Check Terminations

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BRTS-100 ISDN TEST SET

4.5 Passive Bus—Check Terminations

When you’re using a passive-bus configuration, it’s imperative that the last device on the bus be terminated at 100 ohms. The other devices on the bus must be left unterminated. Termination should be an option on each ISDN terminal. Refer to your terminal’s user manual to determine how to configure the terminal in terminated/unterminated mode.

See Figure 4-7 for an outline of the functions performed in this test.

Passive Bus Configuration

 

Check Terminations

PB1

Test Set should be in NORMAL mode

GO TO FIRST

DEVICE ON BUS

 

NO

YES

 

TERMINAL SHOULD

IS TERMINAL

 

NOT BE TERMINATED

LAST DEVICE?

 

PUT CIRCUIT IN

 

 

CONFIG. 3, POWER

 

 

DOWN TERMINAL

 

 

IMPEDANCE

 

 

GRN

RED

 

TEST STATUS?

 

 

RED

 

UNTERMINATE

DEVICE PROPERLY

TERMINATE

TERMINAL

TERMINATED

 

 

DEVICE

 

POWER UP

 

 

TERMINAL, GO TO

 

 

NEXT DEVICE

 

 

ON BUS

 

TERMINAL SHOULD

BE TERMINATED

PUT CIRCUIT IN

CONFIG. 3, POWER

DOWN TERMINAL

IMPEDANCE

TEST STATUS?

GRN

ALL

DEVICES

PROPERLY

TERMINATED

Figure 4-7. Passive bus flow chart.

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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 100 Est FeaturesOperation Connecting the UnitBRTS-100 Isdn Test Set controls and indicators Passive BUS Powering Up the Unit Controls and Indicators Feature ButtonsIndicators Test Status PASS/FAIL Lights Reflects test status Modes of OperationTest Configuration 1 Point-to-Point NT1 Figure Test ProceduresTest Procedures Comprehensive Troubleshooting Procedure Comprehensive troubleshooting flow chart 1 Comprehensive troubleshooting flow chart 2 Phantom Conclusion Light Check PowerCheck Loop Check PowerTest Procedures Check loop flow chart 1 Check loop flow chart 2 Check loop flow chart 3 Test Procedures Passive Bus-Check Terminations Passive Bus Configuration 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 Technical Reference Power-Source IndicatorsActivation/Deactivation Modes Activation/deactivation procedureLine Test/Transmit See Figure Receive TestLevel Test Transmit and line test DC Continuity AC ImpedanceAC impedance Two Test Set units used for tracing SpeakerBattery Replacement Appendix MaintenanceFigure A-2. Replacing the 8-Pin Jack Connectors Pin Jack ReplacementCopyright 2002. Black Box Corporation. All rights reserved