Exploring the boundaries of G€¦ · Alcatel, Lucent, Alcatel-Lucent and the Alcatel-Lucent logo...

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COPYRIGHT © 2015 ALCATEL-LUCENT. ALL RIGHTS RESERVED.

Exploring the boundaries of G.fast

Paul Spruyt – xDSL Strategist 18 June, 2015

Alcatel, Lucent, Alcatel-Lucent and the Alcatel-Lucent logo are trademarks of

Alcatel-Lucent. All other trademarks are the property of their respective owners.

The information presented is subject to change without notice.

Alcatel-Lucent assumes no responsibility for inaccuracies contained herein.

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Shifting the limits of copper

140 Mb/s

60 Mb/s

20 Mb/s

1000 Mb/s

aggregate US+DS rates

G.fast

only achievable

if not mixed

with VDSL2

in cable (2.2MHz -

106MHz)

300 Mb/s

Vplus

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Choosing the right technology

G.fast

VDSL2 17a

size

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G.fast

VDSL2 17a

Vplus

size

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Vplus fills the gap between VDSL2 and G.fast

Vplus allows mixed vectoring with VDSL2 17a (VDSL2 30a does not)

FREQUENCY SPECTRUM

30MHz 25kHz 17.6MHz

Different tone spacing

Vectoring not possible

Same tone spacing

Vectoring possible

4.3kHz

8.6kHz

VDSL2 17a Vectoring Most cost-effective solution

for 100Mb/s

G.FAST 100s of Mb/s at very short distances (<250m)

(solid: VDSL2 overlay ; dashed: 2.2-106 MHz)

Vplus Can be mixed with existing 17a deployment

Longer reach and higher density than G.fast

Cost optimized

35MHz optional

VDSL2 30a

VDSL2 17a

Vplus

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17a Vplus G.fast

Short loops (≤250m) ✔ ✔✔ ✔✔✔

Medium loops (≤500m) ✔✔ ✔✔✔

Long loops (>500m) ✔✔✔ ✔✔✔

Density (max subs) 400p 200p 16-48p

Outside plant costs $ $$ $$$$

Standards ✔ draft text

available ✔(1)

VDSL2 17a vectoring

G.fast

Vplus (35b)

HIGHER RATES

HIGHER COST (1) Amendment 1 (mandatory) consent targeted for July 2015

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0 20 40 60 80 100

bandwidth [MHz]

ADSL

ADSL2+

VDSL2 8b

VDSL2 17a

VDSL2 30a

G.fast 100 MHz

0 20 40 60 80 100

bandwidth [MHz]

ADSL

ADSL2+

VDSL2 8b

VDSL2 17a

VDSL2 30a

G.fast 100 MHz

Shifting the limits of copper

ADSL ADSL2plus VDSL2 8b VDSL2 17a

Vplus/35b 35 MHz

G.fast 106 MHz

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G.fast status - timeline

2010 2011 2012 2013 2014 2015 2016

G.FAST PROOF OF CONCEPT

EARLY OPERATOR LAB TESTS

PROTOTYPE

MORE LAB TESTS

EARLY FIELD TESTS

1ST G.FAST

PRODUCTS

& LARGER

FIELD TRIALS

EARLY G.FAST

DEPLOYMENTS

G.FAST PROJECT

INITIATED IN

ITU

BELL LABS

OMEGA-DSL

PROJECT

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Service provider requirements for G.fast – 2012

• Reverse power feed for the remote device

from the customer’s residential gateway

• Mandatory customer self install

triple-play services with home network bridge

taps, on loops up to 200m

• Node sizes typically 1 to 16 ports

• Support for exchange and derived POTS

• And more

• Service rate performance targets over 0.5 mm

straight loops

500-1000 Mbit/s for FTTB deployments @<100m

500 Mbit/s at 100m

200 Mbit/s at 200m

150 Mbit/s at 250m

≥500 Mbit/s at 50m with start frequency of 23

MHz with FM band notched

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G.fast deployment models

CPE

CPE

CPE

CPE

CPE

CPE

multi-port DPU

FTTB ~FTTH FTTdp

manhole, mini-cabinet,

pole-mount, ….

single-port DPU multi-port DPU multi-port system

FTTCurb

NEW

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G.fast

VDSL2 17a

peak rate

reach

vectoring group size

port density

Impact on power consumption?

not standard related

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G.fast trial results

0

200

400

600

800

1000

0 50 100 150 200 250

Aggre

gate

bit

rate

[M

b/s]

loop length [m] Source: six operator labs

BBF operator target rates

trial rates

G.fast 2.2-91.6 MHz

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G.fast field trials

652 Mbit/s US+DS traffic (74m in-house cable)

Four Acres test facility

24 G.FAST TESTED

WITH 24 OPERATORS

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The numbers are in − Vectoring 2.0 makes G.fast faster

2.2 – 106 MHz 2.2 – 212 MHz

2 pairs active in same cable

measured

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Crosstalk strongly depends on cable type

40 pair cable with almost no crosstalk

G.fast 2.2-91.6 MHz

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G.fast allows for end-user self-installation

some (modest) bit rate loss in case of bridged taps in-house

Bit rate loss may increase if multiple bridged taps

bridged tap 2m, 10m, 20m

100m

Source: ChuangHwa Telecom Labs (CHT-TL) in cooperation with ALU

BT length DS loss US loss

no 0% 0%

20m -6% -5%

10m -6% -4%

2m -13% -8%

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G.fast allows co-existence with VDSL2 and radio services

• ITU-T G.9700 specifies power spectral density

(PSD) mask requirements for G.fast and a set

of tools to reduce the transmit PSD mask for

compliance with:

Regional requirements

Operator requirements e.g. spectrum

compatibility and coexistence with other xDSL

access and home network technologies

Radio services

EMC requirements

DS bit rate loss due to skipping bands: ~10%

(e.g. 558 Mb/s 500 Mb/s)

G.fast start frequency (e.g.

23 MHz) for compatibility

with VDSL2 in same cable

E.g. spectral notches or tone

masking for protecting sensitive

radio bands Source (PSD figure): BT Labs in cooperation with ALU

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G.fast offers control over up/down bit rate ratio

• G.fast makes use of Time Division Duplexing

allowing a flexible configuration of the

upstream / downstream ratio

• All G.fast lines in the same cable need to be

synchronized, with the same up/down split

In presence of crosstalk

DS DS US

MUS MDS

time

TDD frame (e.g. 750s)

US US

Source (bit rate figure): Orange Labs in cooperation with ALU

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Comparing line rate, traffic generator speed & speed test

speedtest.net: 811.24 Mbps aggregate

60% DS - 40% US 80% DS - 20% US

Throughput DS US Agg

Bandwidth 573.94 336.74 910.68 Mbps

Utilization 58.16 34.12 %

Frame Rate 47828 27987 fps

910 Mbps traffic generator

811 Mbps speedtest.net

935 Mbps line rate 990 Mbps line rate

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G.fast/FFTdp status - standards

• ITU G.9700 (G.fast PSD) approved in April 2014

G.9701 (G.fast PHY) approved in Dec 2014

G.9701 Amd.1 (low power states, test parameters)

goal for consent in July 2015

G.997.2 (G.fast mgmt objects) consented Dec 2014

• BBF TR-285 (Broadband Copper Cable Models) published in

Feb 2015

ID-337 (G.fast certification and Interoperability Test

Plan) in preparation for straw ballot submission

OD-335 (Interoperability Test Plan for G.fast

Plugfests) living document

WT-301 (FTTdp architecture) in straw ballot process

• BBF (cont’d) WT-318 (FTTdp management including PMA) under

definition - work in progress

WT-355 (YANG model for G.fast & VDSL2) under

definition - fairly new

• G.fast plugfests Chipset IOP: 4 plugfests so far

System Integrator IOP: 1st in June 2015, next in Nov

• ETSI TS 101 548 V1.2.1 (Requirements for Reverse

Powering) approved in Nov 2014 – specifies

Communication Based Startup (CBSU)

New version of TS 101 548 in preparation – will also

specify Metallic Detection Based Startup (MDSU)

With active participation of

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G.fast amendments in ITU

• G.fast amendment 1

Test parameters: HLOG, QLN, SATN, ALN (tbc)

Low power modes

Bonding

Mandatory

Goal for consent in July 2015, approval earliest

Nov 2015

• G.fast amendment 2 or later

Performance on longer loops

Increased system size

Increased ANDR

Extended bandwidth?

NLP?

…

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G.fast test parameters

G.992.5

ADSL2plus

G.993.2

VDSL2

G.993.5

G.vector

G.fast

SATN Signal attenuation (per band) Y Y N Goal Amd.1

LATN Line attenuation (per band) Y Y N N (1)

SNRps Signal-to-noise ratio per SC Y Y N (2014)

BITSps bit allocation per SC Y Y N (2014)

GAINSps Gain scaling per SC Y Y N Not planned

HLINps Channel characteristics per SC Y Y N Not planned

HLOGps Channel characteristics per SC Y Y N Goal Amd.1

QLNps Quiet line noise PSD per SC Y Y N Goal Amd.1

ALNps Active line noise PSD per SC N N N Amd.1 - tbc

XLINps Xtalk channel characteristics per

SC N N Y Amd.2 ?

SC: sub-carrier

(1) LATN to be calculated by external management entity based on HLOG ; LATN for G.fast will not be defined by ITU

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G.fast low power modes (LPM) - preliminary

LPM When

running on

Use case QoS Service

L2.1-

Normal

Mains power

(Note 1)

Reduced power

consumption (green)

Significantly reduced max data

rate and increased latency

VoIP, while other services

are unused

L2.1-

Battery

Battery

(Note 2)

Lifeline during

battery backup

Significantly reduced max data

rate and increased latency

VoIP talk time on battery

backup

L2.2 Battery

(Note 2)

Lifeline during

battery backup

Extremely reduced maximum

data rate and loss of QoS

Keep-alive applications

during battery backup

Note 1: can be used with local, forward, or reverse powering

Note 2: battery is at DPU location (local or forward powering) or at end-user (reverse powering)

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FTU-N

G.fast low power modes (LPM) - preliminary

• L2.1-Normal, L2.1-Battery and L2.2 are based on scheduled discontinuous operation (SDO)

with only subset of symbols transmitted

RMC symbols: contains RMC data + some user data

Sync symbols: for vectoring tracking

NO DMT data symbols: all quiet

• interaction with VCE DS

US

Sync Frame TDD Frame #4

time ….

Sync symbol

RMC symbol

FTU-O-1

DRA

PCE

L2+ PHY

TCE VCE

BAT-1 LPMode-1 TXOPds/us-1

Env. conditions, e.g. temp simplified reference model of DPU

FTU: G.fast transceiver unit

DRA: dynamic resource allocation

PCE: Power Control Entity

TCE: Timing Control Entity

VCE: Vectoring Control Entity

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Increasing bandwidth

<2.0 Gb/s

<1.0 Gb/s

106 MHz 159 MHz 212MHz

FM (87.5-108)

analog TV/DAB (175-230 MHz)

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FTTdp reverse powering

• Under definition in ETSI TM6

‘European Requirements for Reverse Powering of Remote

Access Equipment’

Not limited to G.fast, e.g. also applicable to VDSL2

Different source classes for short range (60V DC) and long

range (120V DC)

Status: TS 101 548 V1.2.1 approved in Oct 2014 ; ongoing

work on updated version (target 2015)

• Important aspects:

Max distance for reverse powering : depends on guaranteed

power at source & DPU power consumption

First user should be able to power the DPU

Fair distribution of power supply over different active users

Combined use with voice? possible but implications on in-

house installation and DPU

If so, lifeline required? battery needs to feed DPU,

CPE/RGW, possibly dongles

Regulatory aspects?

PS

Home LAN

U-R2 U-R2P

SS ×

PSE CPE

RGW

With active participation of

PS

Home LAN

U-R2P

U-R2D

PSE

RGW

PA PA

PA

SS

CPE

U-R • PSE: Power Sourcing

Equipment

• CPE, RGW and/or PSE

can be combined in

single box

• PS: power splitter

• SS: service splitter

• PA: POTS adaptor

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0 50 100 150 200 250 300 350 400 450 500

bandwidth [MHz]

ADSL

ADSL2+

VDSL2 8b

VDSL2 17a

VDSL2 30a

G.fast 100 MHz

G.fast 200 MHz

XG-FAST

Stretching the limits of copper even further

0 50 100 150 200 250 300 350 400 450 500

bandwidth [MHz]

ADSL

ADSL2+

VDSL2 8b

VDSL2 17a

VDSL2 30a

G.fast 100 MHz

G.fast 200 MHz

XG-FAST

VDSL2 8b VDSL2 17a

Vplus 35 MHz

G.fast 106 MHz

XG-FAST 500 MHz

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(July 9, 2014)

Bell Labs prototype technology also demonstrates potential for 1 Gbps symmetrical services,

paving the way for fiber-speed services where fiber cannot be deployed all the way to the premises.

Distribution Point Unit • Single or very few subscribers

• Very close to end user

Frequently 2 pairs per subscriber • No/little inter-user crosstalk

• High intra-user crosstalk

Reverse Power feeding • Short cables have low resistive loss

aggregation

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0 Gb/s

5 Gb/s

30m 70m 50m

10 Gb/s

single pair

2 pairs

operator cable

CAT5e

7Gb/s @ 70m

2Gb/s @ 70m

Alcatel-Lucent XG-FAST – measured in lab 2 Gb/s over 70m single pair

10 Gb/s over 30m two pairs

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CONCLUSION

• G.9700 & G.9701 APPROVED IN APRIL & DECEMBER 2014

Ongoing work on mandatory test parameters and low power modes as part of G.9701 Amd.1

• G.FAST LAB AND 1ST FIELD RESULTS SEEM TO OUTPERFORM INITIAL PERFORMANCE TARGETS

G.fast field experience still very limited

• G.FAST PRODUCTS AND LARGER FIELD TRIALS IN 2015

• V.PLUS CAN FILL THE GAP BETWEEN VDSL2 AND G.FAST

200-350 Mb/s, compatible with 17a, dense, cost optimized, matches FTTN/curb

• MORE TO COME

Bell Labs demonstrated 2Gb/s and 10 Gb/s over short copper

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Exploring the boundaries of G€¦ · Alcatel, Lucent, Alcatel-Lucent and the Alcatel-Lucent logo...

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