PowerPoint Presentation

Site Troubleshooting GuideLTERBS 6000 Series

RBS 6102RBS 6101RBS 6201RBS 6601RBS 6301RRUMetroPCS primarily uses RBS 6201 inside a weatherized cabinetMetroPCS primarily uses SIMOSome sites will use RBS 6601 with RRUs, but not currently availableWeatherized Cabinet

Majority of MetroPCS sites are outdoors

Cabinet Back

RBS 6201 Hardware

DUL Digital Unit LTE

RU Radio UnitSIMOTx/Rx1Rx2Cabinet Diagram

FansRadioCTransmissionCCPowerRUsDULSIUCabinet No Jumpers

PowerDULsRUsSIUCabinet Jumpers

PowerDULRUsAntenna JumpersDiplexer Site

DiplexerInputOutputLTECDMADiplexer Detail

InputOutputDiplexersVisit PreparationPrinted MaterialsRFDS Sheet with all plumbing diagramsNotes about site accessDirectionsSatellite imageSite Shakedown reportEquipmentCabinet keyDummy load setSitemasterLaptop setup to run TEMS Investigation with UE

Equipment

Cabinet Key

Sitemaster

Laptop with UEFirst StepsBest PracticesTake photos!Be preparedEnsure E-UTRAN support is availableNotify relevant parties based on customer proceduresVisual InspectionMake sure nothing immediately looks incorrectTrace the RU-DUL cables to ensure there are no swapsEnsure the RU-DUL cables have a good connectionCheck small QMA wave guide for damage and ensure connection

PhotosTake a photo of the site label to identify pictures

RU to DUL Jumper check

Ensure the RU-DUL jumpers are correctDULRU-DUL JumpersRURUL QMA Wave Guide Check

Check small QMA wave guide for damage and ensure connection

CorrectBentRUL QMA Wave Guide Check

Bent Connector

Disconnected ConnectorCommon IssuesSector SwapsDL or UL throughput lowBad or no coverageAzimuth incorrect

Sector SwapsCausesRU-DUL cablesJumpers from cabinet to diplexerJumpers from diplexer to antenna feedersAntenna feeders to antennasCDMA incorrectDo not trust colors on cablesTroubleshooting StepsE-UTRAN lock testCable tracing

E-UTRAN Lock TestProcedureHave E-UTRAN lock a single sectorVerify the reference signal transmit light stops blinkingRepeat for each sectorConclusionEnsures that the DUL is configured correctlyVerifies there is no RU-DUL cable swap

E-UTRAN Lock Test

BlinkingTransmitting reference signalsNo LightLocked

Antenna Jumper checkVerify all cables match colors in plumbing diagramsNon-diplex siteTrace the antenna jumpers from the RUL to the back of the cabinetTrace the antenna jumpers from the cabinet to the antenna feedersDiplex siteTrace the antenna jumpers from the RUL to the back of the cabinetTrace the antenna jumpers from the cabinet to the diplexerTrace the antenna jumpers from the diplexer to the antenna feeders

Antenna Jumper Check

Sector 4Verify all cables match colors in plumbing diagrams

Sector 5Sector 6

Antenna Jumper Check

Trace the antenna jumpers from the RUL to the back of the cabinetJumpers exit cabinetJumpers at RUL

View Cabinet BackJumpers exit cabinetAntenna Jumper Check

Jumpers from cabinetAntenna feedersTrace the antenna jumpers from the cabinet to the antenna feedersAntenna Jumper Check DiplexTrace the antenna jumpers from the cabinet to the diplexer

Jumpers enter DiplexerJumpers from cabinetAntenna Jumper Check Diplex

Trace the antenna jumpers from the cabinet to the diplexer Jumpers enter DiplexerJumpers from cabinetDL or UL throughput lowCausesBackhaulAntenna system and jumpersHardware problems with RU-DULTroubleshooting StepsDummy Load TestFeeder SweepsE-UTRAN support

Dummy Load testProcedureTrace the power connector to the RUL and turn it offDetach the antenna jumpers from the RULConnect the attenuators to the RULConnect the dummy antennas to the attenuatorsPower on the RULHave EUTRAN unlock the target sector and lock all other sectorsPlace the UE near the dummy antennasUpload and download a file and record a TEMS logConclusionEliminates or identifies antenna system cause of problemDummy Load Test

Trace the power connector to the RUL and turn it offPower light offDummy Load Test

Detach the antenna jumpers from the RULDisconnected JumpersDummy Load Test

Adapters

Use high power attenuatorsEnsure attenuators are connected to both Tx/Rx2 and Rx2AttenuatorsConnect the attenuators to the RULDummy Load Test

AttenuatorsDummy antennasConnect the dummy antennas to the attenuatorsDummy Load test

Power on the RULPower light onPower ConnectorPower ButtonDummy Load TestHave EUTRAN unlock the target sector and lock all other sectors

Ensure blinkingDummy Load Test

Dummy antennasPlace the UE near the dummy antennasUEDummy Load Test

Upload and download a file and record a TEMS logFeeder SweepsTestsVoltage Standing Wave RatioReturn LossDistance to FaultCovered in a different guideConclusionDetermines if there are problems in the antenna system

E-UTRAN supportProcedureConnect to the cell (dummy load or otherwise)Download or upload a fileHave E-UTRAN monitor the nodeConclusionDetermines if there is a configuration problem or a problem in the backhaulBad or No CoverageCausesAntenna SystemJumpers not connectedHardware problems with RU-DUL (damaged connectors)Troubleshooting StepsEnsure all connectors are tightly securedDummy Load TestFeeder Sweeps

Incorrect AzimuthTroubleshooting StepsDrive TestVisual inspection of antenna direction

THANK YOU