1. Site Troubleshooting Guide
LTE

2. RBS 6000 Series
RBS 6102
RBS 6101
RBS 6201
RBS 6601
RBS 6301
RRU
MetroPCS primarily uses RBS 6201 inside a weatherized cabinet
MetroPCS primarily uses SIMO
Some sites will use RBS 6601 with RRUs, but not currently available

3. Weatherized Cabinet
Majority of MetroPCS sites are outdoors

4. Cabinet – Back

5. RBS 6201 Hardware DUL – Digital Unit LTE RU – Radio Unit SIMO Tx/Rx1

6. Cabinet Diagram
Fans
Radio
RUs
DUL CC
Power
SIU C
Transmission

7. Cabinet – No Jumpers
Power
RUs
DULs
SIU

8. Cabinet – Jumpers
Antenna Jumpers
Power
DUL
RUs

9. Diplexer Site
Diplexer
LTE
CDMA
Output
Input

10. Diplexer Detail
Output
Input
Diplexers

11. Visit Preparation Printed Materials
RFDS Sheet with all plumbing diagrams
Notes about site access
Directions
Satellite image
Site Shakedown report
Equipment
Cabinet key
Dummy load set
Sitemaster
Laptop setup to run TEMS Investigation with UE

12. Equipment
Sitemaster
Laptop with UE
Cabinet Key

13. First Steps Best Practices Take photos! Be prepared
Ensure E-UTRAN support is available
Notify relevant parties based on customer procedures
Visual Inspection
Make sure nothing immediately looks incorrect
Trace the RU-DUL cables to ensure there are no swaps
Ensure the RU-DUL cables have a good connection
Check small QMA wave guide for damage and ensure connection

14. Photos
Take a photo of the site label to identify pictures

15. RU to DUL Jumper check Ensure the RU-DUL jumpers are correct DUL RU

16. RUL QMA Wave Guide Check
Check small QMA wave guide for damage and ensure connection
Bent
Correct

17. RUL QMA Wave Guide Check
Bent Connector
Disconnected Connector

18. Common Issues Sector Swaps DL or UL throughput low Bad or no coverage
Azimuth incorrect

19. Sector Swaps Causes RU-DUL cables Jumpers from cabinet to diplexer
Jumpers from diplexer to antenna feeders
Antenna feeders to antennas
CDMA incorrect
Do not trust colors on cables
Troubleshooting Steps
E-UTRAN lock test
Cable tracing

20. E-UTRAN Lock Test Procedure Conclusion
Have E-UTRAN lock a single sector
Verify the reference signal transmit light stops blinking
Repeat for each sector
Conclusion
Ensures that the DUL is configured correctly
Verifies there is no RU-DUL cable swap

21. E-UTRAN Lock Test Blinking No Light Transmitting reference signals
Locked

22. Antenna Jumper check
Verify all cables match colors in plumbing diagrams
Non-diplex site
Trace the antenna jumpers from the RUL to the back of the cabinet
Trace the antenna jumpers from the cabinet to the antenna feeders
Diplex site
Trace the antenna jumpers from the cabinet to the diplexer
Trace the antenna jumpers from the diplexer to the antenna feeders

23. Antenna Jumper Check
Verify all cables match colors in plumbing diagrams
Sector 4
Sector 5
Sector 6

24. Antenna Jumper Check
Trace the antenna jumpers from the RUL to the back of the cabinet
Jumpers exit cabinet
Jumpers at RUL

25. View – Cabinet Back
Jumpers exit cabinet

26. Antenna Jumper Check
Trace the antenna jumpers from the cabinet to the antenna feeders
Jumpers from cabinet
Antenna feeders

27. Antenna Jumper Check – Diplex
Trace the antenna jumpers from the cabinet to the diplexer
Jumpers from cabinet
Jumpers enter Diplexer

28. Antenna Jumper Check – Diplex
Trace the antenna jumpers from the cabinet to the diplexer
Jumpers from cabinet
Jumpers enter Diplexer

29. DL or UL throughput low Causes Troubleshooting Steps Backhaul
Antenna system and jumpers
Hardware problems with RU-DUL
Troubleshooting Steps
Dummy Load Test
Feeder Sweeps
E-UTRAN support

30. Dummy Load test Procedure
Trace the power connector to the RUL and turn it off
Detach the antenna jumpers from the RUL
Connect the attenuators to the RUL
Connect the dummy antennas to the attenuators
Power on the RUL
Have EUTRAN unlock the target sector and lock all other sectors
Place the UE near the dummy antennas
Upload and download a file and record a TEMS log
Conclusion
Eliminates or identifies antenna system cause of problem

31. Dummy Load Test Trace the power connector to the RUL and turn it off
Power light off

32. Dummy Load Test Detach the antenna jumpers from the RUL
Disconnected Jumpers

33. Dummy Load Test Connect the attenuators to the RUL
Use high power attenuators
Adapters
Attenuators
Ensure attenuators are connected to both Tx/Rx2 and Rx2

34. Dummy Load Test Connect the dummy antennas to the attenuators

35. Dummy Load test Power on the RUL Power light on Power Button
Power Connector

36. Dummy Load Test
Have EUTRAN unlock the target sector and lock all other sectors
Ensure blinking

37. Dummy Load Test
Place the UE near the dummy antennas
Dummy antennas UE

38. Dummy Load Test
Upload and download a file and record a TEMS log

39. Feeder Sweeps Tests Voltage Standing Wave Ratio Return Loss
Distance to Fault
Covered in a different guide
Conclusion
Determines if there are problems in the antenna system

40. E-UTRAN support Procedure Conclusion
Connect to the cell (dummy load or otherwise)
Download or upload a file
Have E-UTRAN monitor the node
Conclusion
Determines if there is a configuration problem or a problem in the backhaul

41. Bad or No Coverage Causes Troubleshooting Steps Antenna System
Jumpers not connected
Hardware problems with RU-DUL (damaged connectors)
Troubleshooting Steps
Ensure all connectors are tightly secured
Dummy Load Test
Feeder Sweeps

42. Incorrect Azimuth Troubleshooting Steps Drive Test
Visual inspection of antenna direction

43. THANK YOU