access evolution 211014 1700 haixiang liang huawei

Dr. Haixiang Liang

Technical Director, Access

Technology Research, Huawei

How Close Are We to

Realising G.fast Potential

HUAWEI TECHNOLOGIES CO., LTD.

Content

G.fast functionalities & standard status

Field trial & test experiences


Service provider requirements

• Low cost，low complexity

• Reverse powering

Low CAPEX

• Low power mode

• Remote management

Low OPEX

• Data rate：1Gbps@50m、500Mbps@100m、200Mbps@200m

• Loop length: 250m or longer

• Support 16 ports，or up to 48、96 ports

• Backwards compatibility to existing DSL

• Flexible US/DS ratio

Strong competitive edges

• Customer self-installed Modem

• SELT、DELT、MELT

Easy to install & maintenance


G.fast key functionalities (1/6)

Duplexing method:

G.fast TDD vs. VDSL2 FDD

Flexible DS/US asymmetry ratio

Easily supports low-power

states

Discontinuous operation

Simpler AFE

Downstream transmission opportunity Upstream transmission opportunity

Tg1

TDD Frame

time

Tg2Tds Tus

Downstream-upstream-guard-time Upstream-downstream-guard-time



Bandwidth:

106 MHz profile in the 1st version

212 MHz profile in a future amendment

Configurable start and stop frequencies, PSD shaping and notching

G.9700(13)_F7-2

ft r2ft r1

PSD indBm/Hz

Frequencyin MHz

−79

−73

−65

−76

10630



Modulation:

Discrete multi-tone (DMT)

G.fast VDSL2 17a

Subcarrier Spacing 51.75kHz 4.3125kHz

Number of Subcarriers 2048 for 106MHz profile

4096 for 212MHz profile 4096

Symbol Rate 48k 4k

Max Bit-loading 12 15

Transmit Power 4dBm 14.5dBm

FEC Trellis + RS Trellis + RS


G.fast key functionalities (4/6) Mandatory support for vectoring – FEXT cancellation

Linear precoding in the 1st version

Non-linear precoding in a future amendment for strong FEXT

0 20 40 60 80 100 120 -80

-60

-40

-20

0

20 Cable with mild xtalk

Frequency/MHz

Attenuation/d

B

Direct channel

Total FEXT channel

0 20 40 60 80 100 120 -60

-50

-40

-30

-20

-10

0 Cable with stronger xtalk

Frequency/MHz

Attenuation/d

B

Direct channel

Total FEXT channel

@>50MHz, direct signal is only

3-10db above crosstalk

@>40MHz, direct signal is similar to

or even lower than crosstalk



PHY layer

retransmission

Improved

robustness against

impulsive noise

events (up to 10ms

duration) without

loss of data while

maintaining low

latency

Upper layers of management protocol

stack

γ_MGMT

α reference point

PMS-TC_MGMT

δ reference pointFTU Management Entity

DTU encoder

PMS-TC Management Entity

Receiver

Data frame Data frame

DTU in DTU out

DTU Interleaver

DTU Scrambler

RTX queue

Padding

RMC encoder

RMC message

Data frame MUX

RTX MUX

RMC scrambler

DTU queue

RM

C fram

er



Fast rate adaptation (FRA)

@ TDD frame rates (< 1ms)

Expected rate for 24AWG

500 Mbps @ 100m

150 Mbps @ 250m

Provides 8kHz NTR

Support for ToD

IEEE 1588

Upper layers of data protocol stack (user data)

γR reference point

TPS-TC_MGMT

αR reference point

FTU Management Entity

Data packet-to-DTU mapper

TPS-TC Management Entity

DTU-to-data packet mapper

Tx DTU Rx DTU

Tx flow control

eoc in

eoc out

TX Enable

STREAMus

STREAMds

Upper layers of management protocol stack

γR_MGMT

ToDNTR

RX Enable


G.fast comparison with VDSL2

TDD •Reducing PHY complexity, reducing AFE requirement

•Flexible US/DS ratio, easier for discontinuous mode for low power

106/212MHz Extend the frequency to 106/212MHz

•Bandwidth ： 6/12 times of VDSL2 17a

•Symbols rate： 12 times higher than 17a

FEC

Change from FDD to TDD

Same as VDSL2: trellis + RS

Vectoring Both use vectoring to cancel FEXT

•Stronger FEXT due to higher frequency band, more difficult

•Smaller vector size


G.fast standard current status

G.9701 Amd 1: low power modes

G.9701 Amd x: 212MHz profile, nonlinear precoding, etc

2013

Q1 Q2 Q3 Q4

2014

Q1 Q2 Q3 Q4

2015

Q1 Q2 Q3 Q4

2016

Q1 Q2 Q3 Q4

G.9700

Determined

G.9700

Approved

G.9701

Consented

Consent

G.9701

Amd 1

Approve

G.9701

Amd 1

Approve

G.9701

Amd x?

Approve

G.9701


Content

G.fast functionalities & standard status

Field trial & test experiences


Early concept prototype

Typical: 1Gbps @100m and 500Mbps @200m

World’s first G.fast prototype

demo in Nov 2011


G.fast FFTD/FTTDp product

Item Description

Size • 320*200*140 mm

NNI • 1*GPON/10G GPON

• 1*GE

UNI • 4-8 ports G.fast with vectoring

Frequency • 106MHz profile

Maximum output power • 4 dBm

Scenario • Manhole, pole, wall

Water proof • IP68

Heat dissipation • Natural cooling

Power • -48V DC local


G.fast CPE

Item Description

Size • 230*205*80 mm

NNI • G.fast

UNI • 4*GE

Frequency • 106MHz profile

Maximum output power • 4 dBm

Vectoring • Support vectoring

Heat dissipation • Natural cooling

Temperature • 0～40℃

PSE • Integrated PSE

Power • 220V/110V AC


BT field trial in lpswich in Oct 2013

• G.fast trial with BT in Ipswich UK

• 3 trial users, 10GPON backhaul

Splitter

G.fast DPU

10GPON

OLT

1st G.fast live customer trial G.fast CPE

Copper

Total: 1.046Gbps = 806.7M down + 239.6M up

CPE In Home DPU In Manhole Power Pillar for DPU


G.fast trial with TeliaSonera in Feb 2014

G.fast trial: Co-exist with ADSL2+, VDSL2

ODF Existing TeliaSonera’s

VDSL2 equipment

Existing other operators’

ADSL2+/VDSL2 service

from CO

DC Power

G.fast DPU

G.fast co-exist with ADSL2+ & VDSL2

23MHz -88MHz with 500Mbps in total

G.fast trial in Helsinki in Feb. 2014


G.fast trial with Swisscom in July 2014

G.fast trial in Riggisberg: Focus on 400m long distance and strong

crosstalk over paper insulated cable


G.fast lab tests with 10+ operators

8-port G.fast

G.fast CPE

G.fast lab test with more than 10 operators

THANK YOU www.huawei.com

Copyright©2014 Huawei Technologies Co., Ltd. All Rights Reserved.

The information in this document may contain predictive statements including, without limitation, statements regarding the

future financial and operating results, future product portfolio, new technology, etc. There are a number of factors that

could cause actual results and developments to differ materially from those expressed or implied in the predictive

statements. Therefore, such information is provided for reference purpose only and constitutes neither an offer nor an

acceptance. Huawei may change the information at any time without notice.

access evolution 211014 1700 haixiang liang huawei

Documents

huawei technologies

fast key functionalities

fast potential page

fast tdd

fast vdsl2

content g

crosstalk page

maintenance page