400g pam4 the wave of the future - ecoc exhibition focus 2017... · 400g pam4 –the wave of the...

400G PAM4 – The Wave of the Future

ECOC 2017

Michael G. Furlong - Senior Director, Product [email protected]

2Inphi Proprietary and Confidential 2Inphi Proprietary and Confidential

100G is Ramping in the Cloud

100G Now Shipping (~2H2016)― Numerous Market Reports

― Millions of Ports/Year

Driven by Cloud TOR/Leaf/Spine Switching― Multiple Suppliers of 100GE Switches

― Numerous Optical Module Developers

― Low Cost DAC for Server 100G Breakout

― Competitive Pricing

Network Traffic Continues to Grow― Doubling Year/Year

― Data-intensive Applications

― Drives the Switch Bandwidth

Switch Bandwidth 400G PAM4


256x100G

PAM4

nx100G (PAM4)

25Tb+

Data Center Switch/Optics Transitions

Sw

itch

ing

So

luti

on

s

Ele

ctr

ical

Inte

rface

Op

tics

128/256x50G

PAM4

8x50G (PAM4)

OSFP

QSFP-DDDR4

FR4

LR8ZR

FR8

SR8

Others….Public

Announcements

6.4/12.8Tb

128/256x25G

NRZ

Others….

4x25G (NRZ)

QSFP28

SR4

ER4LR4

PSM4

CWDM4

CLR4

COLORZ

Public

Announcements

3.2/6.4Tb


Data Center Port Speed Transitions

Arista Networks Confidential 6

Ethernet Speed Transitions by Lane Speed

Lane Speed 10Gbps 25Gbps 50Gbps 100Gbps

1X 10G 25G 50G 100G

2X — 50G 100G 200G

4X 40G 100G 200G 400G

8X — — 400G 800G

Availability 2011 2015 2018 2020

Server Interface

Leaf-Spine Interface

4 Years 3 Years 2 Years

Source: Arista


Relevant 400G Standards/MSAs

<100m

<500m

<2km

<10km

Data Center Network Topology

- 107.8x22.6x9.0mm

- Power < 16W

- TOR L/S Switches

- In Development

CFP8

- 102x40x9.5mm

- Power < 16W

- Routers

- Sampling

- 75.85x18.35x8.5mm

- Power < 14W

- TOR L/S Switches

- In Development

- Defines Electrical

I/O, Connectors,

Thermals, etc.

- In Development

Electrical Standards

802.3bs

400GAUI-8 (CDAUI-8)

IEEE802.3bs OIF

C2C CEI 56G PAM4 VSR

C2M CEI 56G PAM4 MR

802.3cd 50G PAM4 DAC / BKPL

802.3

802.3bs - Target Standard Complete Dec’17

Optical Standards400Gbase- Reach Fiber Speed Spec

LR8 10km SMF 8x50G PAM4 802.3bs

LR4 10km SMF 4x100G PAM4 MSA

FR8 2km SMF 8x50G PAM4 802.3bs

FR4 2km SMF 4x100G PAM4 MSA

DR4 500m P-SMF 4x100G PAM4 802.3bs

SR8 100m MMF 8x50G PAM4 802.3cd


So Why 50G PAM4?

12.8Terabit Switch Bandwidth Options

1. Double the Number of Existing I/O?

● 256 I/O -> 512 I/O at 28Gbaud

● Issues: Die Size, Packaging, Cost

2. Double the Speed on Each I/O

● 28Gbaud NRZ -> 56Gbaud NRZ

● Issues: Channel Loss, SerDes Complexity, Cost, Power

3. Advanced Modulation PAM4

● Same Number of I/O

● Same 28Gbaud Speed

3 Meter DAC – Insertion Loss

56Gb PAM4

56Gb NRZ

PAM4 Meets the Performance,

Power, and Cost objectives for

400G Cloud Data Centers

Benefits of 50Gbps PAM4― Use Existing (and Fewer) 28Gb Optics

― Same Copper Infrastructure● 3 Meter DAC

● Backplanes & Connectors

― Switches can Mix / Match Cables and Optics up to 100Km in Reach


Next Generation 400G Optical Modules

ADC- Multi-tap FFE

- Multi-tap DFE

- Slicer

8:4

Demultiplex

PAM4

Mapping &

Pre-Coder

Host Interface

8:4

Multiplex

PAM4

Mapping &

Pre-Coder

- Multi-tap FIR

- Level Control DAC

PowerLow-speed

CMOS

REFCLK

(If Needed)

PLL/Clocking

Tx FIR

Rx EQCTLE

H

O

S

T

L

I

N

E

8x50G

PAM4

TIA

(x4)

ROSA

(x4)

Linear

Driver

(x4)

TOSA

(x4)

uCPower

RegMisc

OSFP / QSFP-DD / COBO

4

4

-3

-1

+1

+3

Sample

Levels

Control

Interface

OIF CEI 56G VSR

IEEE 400GAUI-8

DSP Line Interface

Clock Recovery

Control Loops

Calibration Algorithms

Diagnostics

Internal Histograms

/Eye DiagramsSystem BER Sweeps

0

Channel SNR

21dB

• Real Time / Easy Access

• Non-destructive

• User Programmable Thresholds

Opt

Mux/

Dmux(FR4/LR4)

PAM4 DSP

8x50G

PAM4

4x

100G

PAM4

4x

100G

PAM4


DSP Advantages For 400G PAM4

-0.5 0 0.5-4

-3

-2

-1

0

1

2

3

4

Time

Am

plit

ude

Eye Diagram

-0.5 0 0.5-1.5

-1

-0.5

0

0.5

1

1.5

Time

Am

plit

ude

Eye Diagram

PAM4 / NRZ

Eyes

-0.5 0 0.5-4

-3

-2

-1

0

1

2

3

4

Time

Am

plit

ude

Eye Diagram

-0.5 0 0.5-2

-1.5

-1

-0.5

0

0.5

1

1.5

2

Time

Am

plit

ude

Eye Diagram

Small

ISI

Plus Noise

PAM4 More Sensitive to ISI and Noise Versus NRZ

― PAM4 has 1/3rd Eye Opening

DSP Equalization

― High Performance (DFE/FFE)

― High Number of Taps

― Proven Algorithms

DSP Performance

― Low Risk

― Enables Lower Cost Optics

Low-power CMOS Process

― 16nm Scaling 7nm

― Meets Module Power Targets

PAM4 DSPs are Low Risk and Enable Low Cost Optics

Meeting the 400G Module Power


Next Generation Cloud – 400G PAM4 Summary

Network Traffic is Driving Switch Bandwidth

Big Data Movement

― Video

― Artificial Intelligence

― IoT

― Many Others…

Cloud

Data

Centers

Switch/Optics

Infrastructure

QSFP28QSFP-DD

OSFP

Switch Bandwidth is driving 400G Interfaces

Next Generation Switches are Coming to Market

Industry Split on Module Form Factor

Optical &

Electrical

Signaling

56Gbps PAM-4 Required to Achieve 12.8T Switch Bandwidth

Optical & Electrical Industry Standards Based on PAM4

PAM4 DSP’s Are Shipping Today


Low PowerHigh Performance

Long Reach

Fast Time-to-market

Competitive Cost

Dedicated Customer Support

Best Quality

Inphi’s Complete Platform to Enable Customer Success

Driver

SiPho

or

Partner Optics

TiA

Optical Platform

PAM4 DSP

Coherent DSP


Live PAM4 DSP Demonstration at ECOC 2017

Highest

Performance 50G

PAM4 DSP

Integrated

EML/VCSEL

Drivers

10G-400G

Backplane Retimer

IEEE FEC/PCS

Booth #337

400G

QSFP-DD/OSFP

Optics

COLORZ-Lite™ QSFP-28

100Gbps PAM4

20km Campus

Thank you

400g pam4 the wave of the future - ecoc exhibition focus 2017... · 400g pam4 –the wave of the...

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