HP 83236B S Interface manual Frame Error Rate Receiver Measurements

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Frame Error Rate (Receiver Measurements)

Chapter 4, Troubleshooting

Errors While Attempting Measurements

Problem:

If your Test System is not set up correctly for receiver tests, you may see erroneous results (extremely high FER or the inability to return a measurement) on the tool you use for displaying the Frame Error Rate calculated by the base station.

The error can occur while using the following menu screen:

•CDMA Generator Menu Selection

Possible causes and solutions:

1Missing an Even-Second clock timing signal.

You must have access to the Even-Second clock signal from the base station to achieve proper correlation to the CDMA signal. Verify that the signal is accessible and make sure that it is connected to the EVEN SECOND/SYNC IN port on front of the Cellular Adapter. To verify your Even-Second clock, see "Check Even-Second Clock" on page 46.

2Test System timebase reference not connected.

Verify that you have access to the base station’s reference timebase signal (typically 19.6608 MHz). The reference should be connected to the SYNTH REF IN port on the rear of the Cellular Adapter. If configured correctly, the REF UNLOCK indicator on the Cellular Adapter should not be on.

3Missing or faulty connections from the PCS Interface output to the receiver inputs of the base station.

Check to see that the RF IN/OUT port of the PCS Interface is connected to the receiver test port of the base station being tested.

4Incorrect Base Station Channel entry.

The Software tunes the CDMA Generator to a receive frequency based on your entry for Base Station Channel. The entry must match the channel your base station is set to receive on. Verify the channel number entry in the Base Station Channel field on the main menu screen. If you want to verify the frequency the Generator is set to, see the Generator Frequency setting at the bottom of the main menu screen.

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Contents CDMA/PCS Base Station Test Software, User’s Guide Restricted Operating Overview Conventions Used in this Book Contents Making Measurements Receiver Sensitivity Operating Overview Setting the Test System Beep Glossary Index Getting Started Introduction You must supply Required EquipmentSynth REF Load and Run the CDMA/PCS BS Test Software Tests Main Menu screen CDMA/PCS Test Software main menu features Select Configuration Information Menu Configure the SoftwareScroll to and select your band of interest User k1 If You Had ProblemsPerform Cdma Tests Perform Cdma Tests Making Measurements Making Measurements Transmitter Measurements Receiver Measurements Other OverviewRequirements Average PowerOverview Information Menu under TX Measurement Path Loss StepsModulation Quality Rho Measurement not Correlating in , Troubleshooting, on Code Domain Power Menu Code Domain Timing Details on the use of the Code Domain Analyzer screen Code Domain Phase Already selected Analyzer Transmit SpectrumSteps Go to Spectrum Analyzer @ Present Chan Steps Go to Spectrum Analyzer & Enter Freq Transmit Spectrum Receiver Sensitivity Main menu, enter the Base Station Channel number Receiver Performance in Additive Noise Error Rate FER is measured at each Eb/No levelEb/No Level Search for PN Offset PN Offset not Found Check Even-Second Clock Check for a valid clock signal from the base stationCorrelating in , Troubleshooting, on Check Even-Second Clock Operating Overview Reference ConfigurationInformation To select a new PCS Band Selecting a PCS BandChannel plans for PCS Band selections You must know the following loss values Compensating for TX and RX Measurement Path LossBeep Saving Configuration Information to MemoryRequirements Steps Loading Configuration Information from MemoryPurging Configuration Information from Memory Turning Off Using AutostartAutostart Feature Turning OnConnections Viewing Instrument ConnectionsSetting the Test System Beep To Memory on Cdma Base Station Operating Overview Troubleshooting Troubleshooting Memory Overflow Errors Errors When Loading and Running the SoftwareTest System Configuration Errors at Runtime Compensation not performed. Check Duplex OUT cable. Retry? Errors When Loading and Running the Software Cdma Measurement not Correlating Errors While Attempting MeasurementsErrors While Attempting Measurements Incorrect Base Station Channel entry Frame Error Rate Receiver MeasurementsErrors While Attempting Measurements Questionable Measurement Results Average PowerReceiver Tests Rho MeasurementsCode Domain MeasurementsSensitivity tests random data not selected for signal source Questionable Measurement Results Glossary Glossary Modulation Quality See Rho Glossary Glossary Glossary Index Index FER Index Oqpsk PCS Qpsk UCT Walsh chip