Data Center Test Solutions - MultiLane...Measure BER as a function of optical power (AOP, OMA) Receiver Sensitivity Integrated Optical Switch Box for SR4 and FR4 transceivers • MLO4034-SR4

Data Center Test Solutions Ethernet in the Data Center - Webinar

Kees PropstraNovember 18th, 2020

Test Challenges

Data Center Test SolutionsData Center Test Solutions

Engineering Life Cycle support

Data Center Test Solutions

Module and Port Optimization

Optical Modules, AOCs and DACs encounter new challenges at PAM4 rates

▪ Power consumption is key - optimization of power consumption yields significant cost savings

▪ MultiLane BERTs support fine-tuning of TX and RX EQ to trade-off BER performance and power consumption for both hosts and pluggables

TX/RX Equalization Control

7-Tap TX Equalization

RX EQ and Diagnostics

EQ Optimization using ML BERT

Moduleoptimization

Switchoptimization

Module and Port Optimization

Error-prone PAM4 designs require advanced BER tracking capabilities▪ Error bursts are a major concern and must be

correctly identified and diagnosed

▪ ThunderBERT enables tracking of cumulative and instantaneous BER data

PAM4 systems rely on Forward Error Correction to stabilize erroneous links▪ ThunderBERT supports Real Hardware RS-FEC Analysis

▪ Correctable/Uncorrectable Codeword count▪ SER Histogram

BER and FEC Analysis

History Navigation to track BER Data

KP4 SER Histogram

Compliance testing

Data Center Test Solutions

Optical Testing

Transmitter

DUT O-DSOBERT

Clock

MCB

ML4041-K-56QSFP56 MCB 4x56Gb

ML4015D-25-SM/MM25 GHz SM O-DSO

ML4039D200G BERT

Test pattern generation PAM4 Eye Diagram etc.

IEEE 802.3bs clause 122. 200GBASE-FR4, 200GBASE-LR4, 400GBASE-FR8, and 400GBASE-LR8

Optical Testing

Test Procedure - stressed eye closure

Stressed Receiver Sensitivity – SRSSRS block diagram

O-DSO ML4015D

JTOL Clock Source ML407-PAM

BERT ML4039D/ML4039EN

E-O MX35D

Open Eye MSA receiver specifications: table 4-3

BERT signal

Add filter (FFE) + Interference (crosstalk noise)

Add Sj JTOL

Calibrated stressed eye

Optical Testing

Measure BER as a function of optical power (AOP, OMA)

Receiver Sensitivity

Integrated Optical Switch Box for SR4 and FR4 transceivers• MLO4034-SR4• MLO4034-CWDM4

BER

ROP

Electrical Testing

Receiver Stress testing

DUTBERT MCB

ML4041-K-56QSFP56 MCB 4x56Gb

ML4039EN200/400G BERTWith Crosstalk Noise

Optical loopback

JTOL Clock

0.0

1.0

2.0

3.0

4.0

5.0

6.0

0.0E+00 5.0E+05 1.0E+06 1.5E+06 2.0E+06 2.5E+06 3.0E+06

Sj m

agni

tude

[U

I]

Frequency [Hz]

Sj vs frequency

ML407-PAMJTOL Clock Source

Clean signal

Impaired signal

IEEE802.3bs Annex 120EChip-to-module(200GAUI-4 C2M)

Electrical Testing

Transmitter testing

DUT

BERT

MCB

ML4041-K-56QSFP56 MCB 4x56Gb

ML4039D200G BERT

Optical loopback orshallow loopback

DSO

ML40254CH 50 GHz E-DSO

Table 120E–3—200GAUI-4 and 400GAUI-8 C2M module output characteristics (at TP4)

Clock

Figures of merit 200GAUI-4

Manufacturing testing

Data Center Test Solutions

DUTBERT Adapter Switch + VOA + PM

O-DSO

4x

ML4054B-QSFPField replace-able interfaceReplace after 500 insertions

Test Electrical IO BER Test Optical IO BER

Test Optical transmitter

MLO4034-SR4/CWDM4Optical Switch Box

ML4015D-25-SM/MM25 GHz SM/MM O-DSO

ML4054B200/400G Manufacturing BERT

Hardware FEC testingTest pre- and post-FECBER/SER

RMA testing

ML7007 Series Productivity Software:

▪ Fully automated test report

▪ Pass/Fail results

It supports most Single Mode (SM) and Multi Mode (MM) 10 to100G optical transceivers available in the market. (200/400Gcoming soon)

▪ Return merchandise authorization (RMA) testing

▪ New supplier validation & incoming inspection

Data Center Test Solutions

‘Optics PhD in a box’

Get PhD insight into your DUT from your Technicians and

Operators!

CMIS testing

CMIS X.X complexity is a challenge for 400GE deployments

ML4066 Adapters and Analyzers / ML4054B

▪ Validate CMIS compliance

▪ Monitor and save I2C transactions between host and pluggable

▪ Validate State Machine command execution

▪ Load and Save Entire MSA files

▪ Read or write individual module registers

Data Center Test Solutions

Module Compliance Board▪ User friendly GUI for I2C R/W

commands and loading custom MSA Memory Maps

▪ Gain access to all high-speed Tx and Rx signals

▪ Compliant with CEI-56G-VSR

▪ DUT voltage supply control

▪ DUT Current Sense

▪ Temperature Monitor

▪ On-board LEDs showing MSA output Alarm states

Host Compliance Board▪ Gain access to all high-speed Tx and Rx

signals

▪ Compliant with CEI-56G-VSR

Connectivity

Data Center Test Solutions

ML4041K-56 Insertion Loss ML4064-HCB Insertion Loss

Port validation

How to validate the proper operation of your system port?▪ Can the port recognize a transceiver? CMIS compatible?

▪ Sufficient Signal Integrity?

▪ Can the system support the intended thermal/power load?

Loopback/thermal loads▪ SI traces loopback Port TX into RX

▪ MSA Housing Compatible▪ QSFP-DD, OSFP, QSFP28, etc.

▪ Programmable power dissipation▪ Up to 30W QSFP-DD800 / OSFP 800

▪ Fully customizable – emulate your Data Center Interconnect

Data Center Test Solutions

Smart Loopbacks

QSFP-DD Example

▪ MSA compatible configuration and EEPROM

▪ Programmable MSA memory pages

▪ Custom memory maps

▪ Low speed I2C signal status

▪ Detect control signals

▪ Force alarm signals

Data Center Test Solutions

LCD Display LED Indicator Pin Header

LCD power state indicator

Monitored LCD

R & G Indicators

Alarm System

4 Temp.Sensors

Voltage Sensor

Current Sensor

Pin header connector

Port Troubleshooting

▪ Loopback test indicates SI problem – high BER

▪ Impedance measurements help identify source of problem

▪ The ML4035 enables TDR Testing for port debug:▪ Isolate impedance mismatches and discontinuities▪ Pass/Fail verdict for each lane▪ Gated TDR enables hone-in on fault area

(for instance, a bad connector or broken pin)▪ Sub ohm accuracy▪ ~1 mm resolution

Data Center Test Solutions

What is next? 800G

Data Center Test Solutions

Conclusions

▪ Equalization tuning critical for system optimization

▪ Hardware FEC provides insight into real system performance

▪ Module compliance testing is a multi-dimensional test challenge

▪ CMIS validation is important for Interoperability

▪ Connectivity to your DUT is a hard requirement for your testing

▪ System Engineering requires stringent Port validation

▪ Port troubleshooting critical part of system debug

▪ Development tools for 800G & volume manufacturing solutions for 400G are needed now

Data Center Test Solutions

THANK YOU