Keysight Technologies N4917CPCA Manuale utente

User Guide

Keysight N4917CPCA

Optical Receiver Stress Test

for CPRI Fronthaul Networks

Notices

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Manual Part Number

N4917-91030

Edition

Edition 2.0, March 2019

Keysight Technologies Deutschland GmbH

Herrenberger Strasse 130,

71034 Böblingen, Germany

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

Keysight N4917CPCA Optical Receiver Stress Test for CPRI Fronthaul Networks User Guide 3

Contents

1Overview

Optical Receiver Stress Test Solution for CPRI Fronthaul Networks —

At a Glance 6

Applicable Standards 6

System Description 7

2 System Requirements For 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 Generator for Sinusoidal Interference 14

Signal Generator for System Clock 14

Lightwave Measurement System 15

DCA-X Oscilloscope 16

DCA-M Oscilloscope 16

Clock Recovery 16

Equipment Configuration 18

Recommended Setup using DCA-M 19

Recommended Setup using DCA-X 20

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

Contents

3 Concepts and Features of N4917CPCA Software

Software concept and flow of Optical Receiver Test 24

Software Functions and Features 25

Parameter files 30

Stressed Receiver Sensitivity Specifications 31

Example CPRI parameter file 33

4 Using the N4917CPCA Software

Starting the System Software 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

Parameter details 53

Running the Stressed Eye calibration 59

OMA setting for DUT measurement 63

Testing a CPRI Interface 66

Jitter Conformance Test 67

Set Result file 68

Parameter Details 69

Running the Jitter Conformance Test 70

Jitter Performance Test 73

Set Result file 74

Parameter Details 74

Running the Jitter Performance Test 75

Fully Automated Jitter Tolerance Testing 79

Index

Keysight N4917CPCA Optical Receiver Stress Test for

CPRI Fronthaul Networks User Guide

1Overview

Optical Receiver Stress Test Solution for CPRI Fronthaul Networks — At a

Glance / 6

System Description / 7

6 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

The N4917CPCA Optical Receiver Stress Test solution for CPRI Fronthaul

Networks is based on the N4917B Optical Receiver Stress Test solution for

100GBASE transceivers, with some modifications to the stress calibration

recipe and adjustable bit rate to meet the needs of CPRI Fronthaul

Network Testing.

The Keysight N4917CPCA Optical Receiver Stress Test Solution provides a

platform for stressed receiver sensitivity test, which can be used with

10GBASE, 40GBASE, and 100GBASE devices in a CPRI Fronthaul

environment. The solution consists of several test instruments 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.

Some salient features of the N4917CPCA Optical Receiver Stress Test

Solution include:

• remote control of all the test instrumentation

• automated calibration of the optical stressed eye parameters (ER, VECP

J2, J9, and OMA)

• adjustable target values for ER, VECP, J2, J9, and OMA

• jitter tolerance compliance and margin tests

Applicable Standards

The N4917CPCA Optical Receiver Stress Test software supports

automated optical stressed receiver sensitivity test for optical transceivers

in a CPRI Fronthaul environment that are compliant with the following

standards:

Test Name Reference Standard

10GBASE-LR/ER/SR IEEE 802.3 2018 Clause 52

40GBASE-LR4/ER4 IEEE 802.3 2018 Clause 87

100GBASE-LR4/ER4 IEEE 802.3 2018 Clause 88

- CPRI Specification V7.0

Keysight N4917CPCA Optical Receiver Stress Test for CPRI Fronthaul Networks User Guide 7

Overview 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

fixed or tunable laser

• a digital sampling oscilloscope required for calibration of the stressed

eye

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

1 Overview

Figure 1 shows a typical Optical Receiver Stressed Test equipment setup.

Figure 1 Example 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, BUJ and

sinusoidal timing jitter, ISI and sinusoidal amplitude interference) at the

data signal output. It uses a combination of built-in stress sources along

with an external generator.

Keysight N4917CPCA Optical Receiver Stress Test for CPRI Fronthaul Networks User Guide 9

Overview 1

The electrical signal generated from the BERT is fed into an 81490/91A

electrical-optical converter to modulate the laser and create a stressed

optical signal.

Depending on which standard is being tested, either an 8160xA tunable

laser or the internal 8149xA laser can be used. The optical output of the

8149xA is attenuated to achieve the required optical power level at the

input of the receiver under test.

Prior to testing the receiver, the optical signal for each wavelength is

calibrated using an N1092x DCA-M Sampling Oscilloscope or an

86100D/N1000A DCA-X Wide-Bandwidth Oscilloscope with an 86105D

optical module set up as a reference receiver.

The equipment used in the Optical Stressed Eye Test Setup is under

control of the N4917CPCA Test Solution software, which takes care of the

various equipment settings and performs an iterative adjustment of the

BERT stresses until the optical signal measured on the DCA meets the

required stressed eye parameters.

The N4917CPCA Optical Receiver Stress Test 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 uncorrelated jitter (BUJ) to be used as an

alternative to sinusoidal jitter or random jitter when calibrating the

stressed eye. BUJ can provide a better model for crosstalk in CPRI

fronthaul network testing. A simple switch in the software GUI enables the

user to choose between BUJ and PJ2 (sinusoidal jitter) for 40/100GBASE

standards, or BUJ and RJ (random jitter) for the 10GBASE standard.

Additionally CPRI fronthaul networks generally run at slightly different line

rates, e.g. CPRI option 10 bit rate is 24.33024 Gb/s instead of 25.78125

Gb/s. The N4917CPCA lets the user adjust the bit rate prior to a stressed

eye calibration.

Once you achieve the calibrated stressed eye, proceed to test an actual

device (DUT). In fronthaul testing priority is placed on the impact of jitter

on the recovered clock frequency, which is usually measured with an

oscilloscope. Consequently, DUT BER measurements at the receiver are

not common. However if required, the N4917CPCA does provide

semi-automated Jitter Tolerance measurements routines or you can

perform the equivalent fully automated measurement on a Bit Error Rate

Tester (BERT).

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

1 Overview

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