Transcription
Tetra Base Station Test and Monitoring
Introduction to Tetra Base Station Test and Monitoring· The two options TETRA Base Station Monitoring ( R8-TETRA BSM) and TETRA Base Station T1 Test(R8-TETRA BST1) share the same operating interface· Whilst TETRA Base Station Monitoring Option may be purchased and operated as a stand aloneapplication, TETRA Base Station T1 Test requires that TETRA Base Station Monitoring is enabled· The user may select between these options on the fly if enabled· The purchase of TETRA Base Station T1 Test application includes the TETRA Base StationMonitoring application· There is an upgrade path from TETRA Base Station Monitoring to TETRA Base Station T1 Test· Mobile Country Code(MCC), Mobile Network Code(MNC), Base Station Colour Code(BCC) and Local AreaCode(Larea) are only decoded and displayed in the TETRA Base Station T1 Test application· Both options conduct full transmitter parametric measurements, either by direct connect orOTA antenna connection· The TETRA Base Station T1 Test option has additional transmitter and receiver T1 measurementsfor BER/MER1
Initial Power On1. Initial Power On2. Press Green Power Button3. Wait for configuration to load around 30 Seconds4. Press Blue “TEST’’ ButtonSelect “Test Mode”On Page 2 Select ‘‘TETRA Base Station’’Select “Test Mode”Select ‘’T1 Mode’’ or “Monitor Mode”2
RX Tones and Voice LoopbackThis feature works in any Duplex call type.Example:Set up a Group Call:Select “Call Type and “Group” from the dropdown menuSelect “Select Group”” the radio will have sent Group Allocations during Registration.Select the Group to make the call toSelect “Call Mobile”The Mobile will indicate Group Call ID 777 on its display.Press PTT to observe TX measurementsRelease PTT“Select Voice Loopback”Scroll to each tone in the menu to hear them on the mobiles speakerSelect “Voice”Press PTT and speak into the microphone to record a messageRelease PTT. Recorded message will play back repeatedly until “OFF” is selectedNote. A manual test of the RX sensitivity can be made by:Selecting “RF Level” then adjust negatively until the speech be comes broken up. -116 to -120 is atypical level for breakup of voice.14
Full Screen Graphical DisplaysBar ChartsBar charts provide a graphical representation of measured parameters.Colour coded pass/fail as in the main screen.The White markers indicate the limit of each parameter.Individual Limits may be adjusted by the operatorPower Class selection loads the limits for that class of radio.15
Spectrum AnalyserThe Spectrum Analyser will be familiar as it is a copy on of the main Spectrum Analyser from the standardR8100. Only the functions applicable to TMO have been copied across,Page through all the menu pages to see the features included.Start/Stop FrequencyDisplay Mode-Max Hold is useful for capturing the TDMA Bursts.MarkersMarker Modes-Delta Mode is useful to measure channel bandwidthAdjustable Span16
Power ProfileTDMA slot view2 Markers for timing analysisMarkers toggle for Mkr1 or Mkr2 adjustment.Constellation DisplayIndustry standard QPSK ConstellationsGraphical representation of:Phase errorsAmplitude ErrorsI/Q Imbalance17
Test LimitsThis menu allows the operator to set his own limits for each TMO parameter being measuredThese limits are mirrored in the Bar Charts display.The setting of each parameter is used to calculate pass/fail results automatically.The default key returns all limits the ETSI standardCall TypesEach type of call can be made individually to and from the mobile.Ind Duplex Simultaneous TX and RXInd Simplex PTT to TX.Group PTT to TXPhone Simultaneous TX and RXSDS & DGNA Send and Receive short message, Assign and Unassign Dynamic Groups OTA.EmergencyAmbient Listening. Covert operation Radio speaker is inhibited, Microphone is live.All of these can be activated or turned off by the Radio’s Programming software.Call initiation and connections can be made by the MS Radio or the BS R8100.18
BST T1 Mode operation1. Connect the Base Station RF to the units RF I/O port2. On Page 2 of 2 select “Monitor Port” and set to RF I/O3. Depending on the BS Output Power the Attenuation mayrequire adjustment4. Enter the BS Downlink Frequency5. Or select from the channel planNote: The Uplink channel parameters are set in the channelplan. Entry of a Frequency directly will use this plan todefine the Uplink Parameters automaticallyThe unit will display :Self Synch in Progress and synchronise to the BS SignalWhen synchronisation is achieved the TETRA Signal Detectedwill be displayedIf the BS is transmitting a T1 signal this will be displayed asTETRA T1 DetectedChannel, T1 Type, MNC,MCC, BCC and LAAre decoded and displayedAll Transmitter measurements are now live in both digital andgraphical displays3
Graphical DisplaysThe Graphical Displays key provides access to full screendisplays for:· Bar Charts· Spectrum· Power Profile· ConstellationsUpper and Lower Mini GraphsThe Graphical Displays key provides access to full screendisplays for:· Bar Charts· Spectrum· Power Profile· Constellations4
Upper and Lower Mini GraphsChannel Plan Settings5Test Limit Settings
Automatic Transmitter TestIf a valid TETRA signal is present live Test Results will becalculated and displayedTo save these results select:Test ResultsTest Results and Save to FileWhen a USB flash drive is inserted into the unit the buttonExport to CSV becomes activeA folder named “Freedom” will be Created on the drive witha sub folder named “TETRA BST” and a sub-folder named“Results”The same folder will have a sub-folder named “ScreenShots”Full screen jpg format screen shotsMay be saved at any time by selecting Shift 0 at any time6
TETRA T1 TestingTETRA T1 TestingThere are two Modes of Operation:User Defined and Base Station SpecificIn User Defined the operator may select:1. Uplink Signal Type· Auto responds to a valid T1 Downlink and sets the appropriateUplink response· Selectable:TCH 7.2SCH/FSTCH STCHSCH/HU SCH HUTCH/STCH/2.4 N 1TCH/4.8 N 12. Uplink Signal ModeAutoTX ONTransmitReceiveLoopbackManual TransmitNote: The user of this mode must haveIntimate knowledge of the BS and its T1 test proceduresMNC,MCC and BCC are set in the Channel Planto support the above selections for validscrambling encode/decode.7
Channel Plan ScreenValid T1 Signal Flow Searching Found Proving ConnectedSelect T1 Test Key to make and see measurementsTest Results Screen8
T1 Measurements Display Screen Motorola MTS1 or Dimetra SelectedRF Adjust for Uplink RX Test ofBER/MERMotorola MTS & Dimetra Pre-set Test ConditionsDownlink TX MeasurementsUplink Measurements are displayed on the OEM BSControl software screenTETRA T1 Testing9
· Auto responds to a valid T1 Downlink and sets the appropriate Uplink response · Selectable: TCH 7.2 SCH/F STCH STCH SCH/HU SCH HU TCH/S TCH/2.4 N 1 TCH/4.8 N 1 2. Uplink Signal Mode Auto TX ON Transmit Receive Loopback Manual Transmit Note: The user of this mode must have Intimate knowle
