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ADCP-75-214 • Issue 2 • September 2006
Page 14
© 2006, ADC Telecommunications, Inc.
4. Re-connect Bias-T with a T adapter. Verify voltage on the T adapter _______ VDC.
Normal is 15 VDC.
5. Re-connect to original configuration and return to service. PDU should illuminate a green
LED for each active TMA if there are no faults in the system.
6. Check with operators for improved performance.
4.2 Troubleshooting Hints
• If voltage is outside of the normal range, trace it back towards the fault.
• If no resistance or low resistance, check protector, feedline, jumpers and MHU.
• If an infinite resistance reading (sometimes indicated by OL), check to see if MHU is
installed or for a discontinuity exists up to the MHU.
• Normal in-band RL should be greater than 18dB. If less than 18dB, check protector,
feedline, jumpers and antenna.
• Mark receive and transmit bands to verify correct filtering.
• Check the distance to fault to identify any anomalies on the feedline.
PDU