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Keysight N4917CPCA Optical Receiver Stress Test for CPRI Fronthaul Networks User Guide

Overview

System Description

The N4917CPCA Test Solution for Optical Stressed Eye consists of:
• a BERT to generate electrical signal
• an electrical-optical converter that modulates the optical signal from a

fixed or tunable laser

• a digital sampling oscilloscope required for calibration of the stressed

eye

Summary of Contents for N4917CPCA

Page 1: ...User Guide Keysight N4917CPCA Optical Receiver Stress Test for CPRI Fronthaul Networks...

Page 2: ...nd those set forth in the EULA shall apply except to the extent that those terms rights or licenses are explicitly required from all providers of commercial computer software pursuant to the FAR and t...

Page 3: ...N4917CPCA Hardware and Software Requirements 12 PC Hardware Requirements 12 PC Software Requirements 12 PC Interfaces 12 Instrument Firmware Requirements 12 Supported Equipment 14 BERT 14 Signal Gener...

Page 4: ...tware 38 Selecting a Standard for Optical Receiver Stress Test 39 Connecting to Equipment 40 System Performance Check 44 Main GUI 48 Stressed Eye Calibration 50 Set Parameter file and Result file 50 P...

Page 5: ...Keysight N4917CPCA Optical Receiver Stress Test for CPRI Fronthaul Networks User Guide 1 Overview Optical Receiver Stress Test Solution for CPRI Fronthaul Networks At a Glance 6 System Description 7...

Page 6: ...nstruments such as a Bit Error Rate Tester BERT Digital Sampling Scope DCA Optical Reference Transmitter Tunable Laser and Optical Attenuator operating together with the N4917CPCA software package Som...

Page 7: ...1 System Description The N4917CPCA Test Solution for Optical Stressed Eye consists of a BERT to generate electrical signal an electrical optical converter that modulates the optical signal from a fix...

Page 8: ...xample setup In the Optical Stressed Eye Test Setup the J BERT M8020A High Performance BERT system is the core instrument that generates an electrical signal with all the required impairments random B...

Page 9: ...est Solution software also allows for precise repeatable calibration of an optical stressed eye The N4917CPCA Optical Receiver Stress Test solution enables an additional stress source bounded uncorrel...

Page 10: ...10 Keysight N4917CPCA Optical Receiver Stress Test for CPRI Fronthaul Networks User Guide 1 Overview...

Page 11: ...ght N4917CPCA Optical Receiver Stress Test for CPRI Fronthaul Networks User Guide 2 System Requirements For N4917CPCA Hardware and Software Requirements 12 Supported Equipment 14 Equipment Configurati...

Page 12: ...Memory 8 GB RAM minimum Monitor Resolution WXGA 1440 x 900 minimum PC Software Requirements Keysight IO Libraries Suite Software Ver 17 2 x or later M8070A B system software for M8000 series M8070A ve...

Page 13: ...Test for CPRI Fronthaul Networks User Guide 13 System Requirements for N4917CPCA 2 M8070A B System Software as specified earlier 86100D DCA X FlexDCA version A 06 02 or later 8164B LMS Ver V5 25 or la...

Page 14: ...RT module M8062A G32 0G4 0G5 32 Gb s Front End Full BERT M8041A C16 0G2 0G3 0A2 High Performance BERT module M8062A C32 0G4 0G5 0A4 32 Gb s Front End Signal Generator for Sinusoidal Interference 81150...

Page 15: ...0 nm or 81608A 113 Tunable Laser 1240 1380 nm or 81609A 113 Tunable Laser 1240 1380 nm Tunable lasers 1550 nm 81606A 116 Tunable laser 1490 1640 nm 81606A 216 Tunable laser 1450 1650 nm 81607A 116 Tun...

Page 16: ...0 300 DCA X mainframe N1000A PLK LOJ PTB DCA X mainframe 86105D 281 IRC 50 GHz Electrical 34 GHz Optical module or 86115D 282 IRC dual 34 GHz Optical module or 86105C 200 IRC 20 GHz Electrical 9 GHz O...

Page 17: ...eceiver Stress Test for CPRI Fronthaul Networks User Guide 17 System Requirements for N4917CPCA 2 N1078A 225 S50 Clock Recovery 25 29 Gbd N1078A 232 S50 Clock Recovery 125 Mbd 32 Gbd N1078A 264 S50 Cl...

Page 18: ...uration The supported equipment described in the previous section provides the flexibility to assemble the system configuration in various ways The N4917CPCA Optical Receiver Stress Test recommended c...

Page 19: ...Stress Test for CPRI Fronthaul Networks User Guide 19 System Requirements for N4917CPCA 2 Recommended Setup using DCA M Connect the equipment and cabling as shown in Figure 2 Figure 2 Optical Receiver...

Page 20: ...er Stress Test for CPRI Fronthaul Networks User Guide 2 System Requirements for N4917CPCA Recommended Setup using DCA X Connect the equipment and cabling as shown in Figure 3 Figure 3 Optical Receiver...

Page 21: ...ns to these configurations include using an external system clock using a signal generator instead of the pulse function generator for the interference source using an external optical attenuator inst...

Page 22: ...22 Keysight N4917CPCA Optical Receiver Stress Test for CPRI Fronthaul Networks User Guide 2 System Requirements for N4917CPCA...

Page 23: ...Keysight N4917CPCA Optical Receiver Stress Test User Guide 3 Concepts and Features of N4917CPCA Software Software concept and flow of Optical Receiver Test 24 Parameter files 30...

Page 24: ...formance routine to test one channel at a time of the DUT Figure 4 Stressed Eye Calibration and Measurement flow The calibrated parameters in the stressed eye are Extinction Ratio VECP J2 and J9 The S...

Page 25: ...ettings provided Load the parameters for the test from the Parameter file or from a previous Results file Once loaded you may also adjust the parameter values in the software GUI prior to running the...

Page 26: ...ce frequency GHz Intersymbol interference amplitude dB Sinusoidal interference frequency MHz Sinusoidal interference amplitude mVpp Common mode interference gain Periodic jitter 1 frequency MHz Period...

Page 27: ...then achieved by adding additional SI sinusoidal interference and jitter Jitter Conformance Test This feature of the N4917CPCA software performs a jitter tolerance test based on the applicable standar...

Page 28: ...BER Note that the Jitter Performance Test sets up only the SJ stress level You must manually enter the device BER and the Pass Fail criteria The test builds a table and a plot for SJ frequency amplitu...

Page 29: ...Features of N4917CPCA Software 3 Table 3 Parameters for Jitter Performance Test Parameters Setting Parameters SJ start frequency kHz SJ stop frequency kHz SJ number of frequency points SJ amplitude UI...

Page 30: ...vided as part of the software installation However in general you must customize some of the values in the file for your own system Existing or new parameter files can also be saved created directly f...

Page 31: ...ss Test for CPRI Fronthaul Networks User Guide 31 Concepts and Features of N4917CPCA Software 3 Stressed Receiver Sensitivity Specifications For reference Table 4 lists the salient conditions required...

Page 32: ...B min Vertical eye closure penalty VECP Stressed eye closure for SR4 1 8 dB 3 5 dB 1 9 dB 2 2 dB 2 2 dB 2 7 dB 3 5 dB J2 Jitter 0 3 UI 0 3 UI 0 3 UI 0 3 UI 0 3 UI 0 3 UI 0 3 UI J9 Jitter 0 47 UI 0 47...

Page 33: ...ameter 100GBASE Eye_parameters_100G_LR4_PJ2_L0 csv Comment Measurement Condition Measurement Mode 100GBASE LR4 ER4 Measurement type ERTgt dB 4 25 Target values for defining a Stressed Optical waveform...

Page 34: ...cy point for ISI amplitude setting SIFreq MHz 150 13 Frequency of sinusoidal interference SourcePower dBm 13 Tunable laser power DataPattern PRBS9 Do not adjust BitRate Gbps 24 33024 Data rate WaveLen...

Page 35: ...0 1 Starting value of BUJ amplitude BUJDataRate Mb s 625 BUJ PRBS data rate BUJPolynomial 2 7 1 BUJ PRBS pattern BUJFilterType MHz 200 BUJ filter RefRcvrBwVCouplingOn 0 0 set DCA reference receiver to...

Page 36: ...36 Keysight N4917CPCA Optical Receiver Stress Test for CPRI Fronthaul Networks User Guide 3 Concepts and Features of N4917CPCA Software...

Page 37: ...eiver Stress Test User Guide 4 Using the N4917CPCA Software Starting the System Software 38 Main GUI 48 Stressed Eye Calibration 50 Jitter Conformance Test 67 Jitter Performance Test 73 Fully Automate...

Page 38: ...rt menu click All Programs Keysight N4917CPCA Keysight N4917CPCA The main window of the N4917CPCA software is displayed see Figure 6 NOTE Before launching the N4917CPCA Optical Receiver Stress Test so...

Page 39: ...e 39 Using the N4917CPCA Software 4 Figure 6 N4917CPCA Software Main window Selecting a Standard for Optical Receiver Stress Test The N4917CPCA software supports different standards for optical receiv...

Page 40: ...r CPRI Fronthaul Networks User Guide 4 Using the N4917CPCA Software Figure 7 N4917CPCA Mode Selection Connecting to Equipment From the Setting menu select System Connection Check to enter the remote c...

Page 41: ...CPRI Fronthaul Networks User Guide 41 Using the N4917CPCA Software 4 Figure 8 N4917CPCA System Connection Check NOTE Instruments may need to be connected or discovered with Keysight IO Libraries Conn...

Page 42: ...ch instrument in use select the correct model number enter the VISA address and where necessary the slot or channel number A selection of instruments is supported including in some cases the option fo...

Page 43: ...tart button to test the connections Connection to each instrument will be verified and either shown as a pass or fail with error information Figure 10 Successful System Connection Check NOTE VISA IP a...

Page 44: ...m performance The System Performance Check ensures that all connections are correct and that the basic system performance is sufficient before running a stressed eye calibration Power on all equipment...

Page 45: ...dow you can set the BERT de emphasis Pre cursor1 and Post cursors 1 2 if desired to obtain an optimum optical waveform with minimum jitter Usually for 100GBASE configurations around 2 dB of Post curso...

Page 46: ...The results of this clean optical signal are displayed in the first column of the table The other columns Lower Limit and Upper Limit are not hard limits they are just a typical range of values that m...

Page 47: ...s Test for CPRI Fronthaul Networks User Guide 47 Using the N4917CPCA Software 4 In the example shown below the J2 margin 300 mUI J2 mUI 76 mUI is less than the J9 margin 470 mUI J9 mUI 160 mUI Figure...

Page 48: ...shows the different areas on the main window of the N4917CPCA Optical Receiver Stress Test Solution software Also there are three tabs Stressed Eye Jitter Conformance and Jitter Performance that defi...

Page 49: ...l Networks User Guide 49 Using the N4917CPCA Software 4 Under each tab you will commonly find that the left side of the window is an area to set parameters for measurements and the right side is an ar...

Page 50: ...CPCA Optical Receiver Stress Test for CPRI Fronthaul Networks User Guide 4 Using the N4917CPCA Software Stressed Eye Calibration Set Parameter file and Result file Figure 15 Setting Parameter and Resu...

Page 51: ...ntil the set up is complete 2 Click the Set file button to specify a result file Default location for results files is C Users Public Public Documents N4917CPCA Result These files can have any name fo...

Page 52: ...ne the DCA reference receiver bandwidth to be 75 of the bit rate e g 19 34 GHz BW for 25 78125 Gb s data rate and 7 465 GHz BW for 10 3215 Gb s date rate This is achieved by using either hardware filt...

Page 53: ...test to verify performance It is not recommended to check some but uncheck others as these items in general are interdependent Figure 17 Measurement Items Figure 18 and Figure 19 show the PJ2 and BUJ...

Page 54: ...r CPRI Fronthaul Networks User Guide 4 Using the N4917CPCA Software Figure 18 Adjustment Parameters PJ2 Figure 19 Adjustment Parameters BUJ Although interdependent Table 5 indicates which adjustment p...

Page 55: ...e 20 Other Parameters PJ2 Figure 21 Other Parameters BUJ Generally there is no need to make any changes to the remaining parameters Order Measurement Item Adjustment Item Note 1 Extinction Ratio Data...

Page 56: ...where the PJ2 BUJ or RJ BUJ selection can be made Additionally you can select the BUJ Polynomial and Filter from this dialog Figure 23 Selecting the signal kind and BUJ parameters BUJ amplitude and B...

Page 57: ...are displayed in the main window depending on which is the currently active selection between BUJ and PJ2 RJ Bit Rate Select the operating bit rate from the drop down list Ensure that you select a bit...

Page 58: ...26 Ref Rcvr BW Coupling is OFF Figure 27 Ref Rcvr BW Coupling is ON When Ref Rcvr BW is ON the Ref Rcvr BW GHz parameter on the main window is grayed out and uneditable The value shown in the box may...

Page 59: ...Receiver Stress Test for CPRI Fronthaul Networks User Guide 59 Using the N4917CPCA Software 4 Running the Stressed Eye calibration 1 Click Start S to commence the Stressed Eye calibration Figure 28 Ma...

Page 60: ...60 Keysight N4917CPCA Optical Receiver Stress Test for CPRI Fronthaul Networks User Guide 4 Using the N4917CPCA Software Figure 29 Main window Results area BUJ Figure 30 Measurement results...

Page 61: ...icate that calibration was not successful The stressed eye calibration sets the desired Extinction Ratio then sets the initial VECP followed by iterating a repetitive loop of setting VECP J2 and J9 un...

Page 62: ...Fronthaul Networks User Guide 4 Using the N4917CPCA Software Figure 33 Stressed eye calibration status messages During the stressed eye calibration the lower part of the results area shows status mes...

Page 63: ...aken from the DCA as shown in Figure 34 Figure 34 Stressed eye calibration complete waveform capture from DCA Results of the calibration along with complete parameter settings are saved in the specifi...

Page 64: ...64 Keysight N4917CPCA Optical Receiver Stress Test for CPRI Fronthaul Networks User Guide 4 Using the N4917CPCA Software Figure 35 Main window after Stressed Eye Calibration is complete PJ2...

Page 65: ...Keysight N4917CPCA Optical Receiver Stress Test for CPRI Fronthaul Networks User Guide 65 Using the N4917CPCA Software 4 Figure 36 Main window after Stressed Eye Calibration is complete BUJ...

Page 66: ...terface device under test Exact connection details and setup depend on the system architecture being tested and are therefore not covered in detail in this guide CPRI Fronthaul Radio Equipment Input T...

Page 67: ...k the DUT stressed receiver sensitivity in accordance with the applicable standard You must run the Stressed Eye Calibration before running the Jitter Conformance Test Figure 38 Jitter Conformance tes...

Page 68: ...re Set Result file Figure 39 Setting Result file location The N4917CPCA Test Solution software automatically loads parameters from the most recent Stressed Eye Calibration 1 Click the Set file button...

Page 69: ...of test frequencies are equally spaced between the specified start and stop frequency Jitter amplitude is set either to the specified compliance value or to a percentage higher than the compliance va...

Page 70: ...ning parameters as the N4917CPCA Test Solution software automatically loads such parameters from the Stressed Eye Calibration Results file Running the Jitter Conformance Test 1 Click Start S to commen...

Page 71: ...I Fronthaul Networks User Guide 71 Using the N4917CPCA Software 4 Figure 41 GO NoGO Dialog Box Figure 42 GO NoGO dialog box with BER and judgment entered 2 Click Next to proceed to the next SJ test po...

Page 72: ...eceiver Stress Test for CPRI Fronthaul Networks User Guide 4 Using the N4917CPCA Software Results of the Jitter Conformance test are saved in the specified Results file Figure 43 Jitter Conformance wi...

Page 73: ...T margin for stressed receiver sensitivity You must run the Stressed Eye Calibration before running the Jitter Performance Test The Jitter Performance test routine sets up the jitter frequency and amp...

Page 74: ...sult file Figure 45 Setting Result File location The N4917CPCA Test Solution software automatically loads parameters from the most recent Stressed Eye Calibration 1 Click the Set file button and speci...

Page 75: ...ced between the specified start and stop frequency values In Manual mode the SJ frequency and amplitude values are defined in a Frequency List file Default location for the Frequency List file is C Us...

Page 76: ...ide 4 Using the N4917CPCA Software Figure 47 Enter SJ Amplitude Dialog Box 2 Click Next A dialog box appears where you must enter the BER value read from the DUT and decide on selecting either GO or N...

Page 77: ...3 Click Next to proceed to the next step or click Exit to abort the Jitter Performance Test 4 You may now enter another Jitter amplitude to test at the same SJ frequency or click Next Freq to proceed...

Page 78: ...78 Keysight N4917CPCA Optical Receiver Stress Test for CPRI Fronthaul Networks User Guide 4 Using the N4917CPCA Software Figure 51 Jitter Performance window after the test is complete...

Page 79: ...e DUT can be put into a loopback mode and a signal from the lane under test can be fed back to the BERT Analyzer input or b the DUT can be controlled directly from the M8070A B software using the DUT...

Page 80: ...ess Test for CPRI Fronthaul Networks User Guide 4 Using the N4917CPCA Software For more information on the M8070A B Jitter Tolerance measurement capabilities refer to M8070A B System Software for M800...

Page 81: ...n JTOL measurement 79 C calibrated parameters 24 E electrical optical converter 7 F File Format Parameter File 30 Frequency List file 69 75 G GO 70 J J BERT M8020A High Performance BERT system 8 judgm...

Page 82: ...82 Keysight N4917CPCA Optical Receiver Stress Test for CPRI Fronthaul Networks User Guide Index...

Page 83: ...Keysight N4917CPCA Optical Receiver Stress Test for CPRI Fronthaul Networks User Guide 83...

Page 84: ...This information is subject to change without notice Keysight Technologies 2017 2019 Edition 2 0 March 2019 www keysight com...

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