Exploring the boundaries of G.fast

Transcription

1 Exploring the boundaries of G.fast Paul Spruyt xdsl Strategist 18 June,

2 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.

3 Shifting the limits of copper 1000 Mb/s 20 Mb/s 60 Mb/s only achievable if not mixed with VDSL2 in cable (2.2MHz - 106MHz) 140 Mb/s Vplus aggregate US+DS rates 300 Mb/s G.fast 3

4 Choosing the right technology G.fast VDSL2 17a size 4

5 Choosing the right technology G.fast Vplus VDSL2 17a size 5

6 Vplus fills the gap between VDSL2 and G.fast Vplus allows mixed vectoring with VDSL2 17a (VDSL2 30a does not) VDSL2 30a 8.6kHz G.FAST 100s of Mb/s at very short distances (<250m) (solid: VDSL2 overlay ; dashed: MHz) VDSL2 17a Different tone spacing Vectoring not possible Vplus Can be mixed with existing 17a deployment Longer reach and higher density than G.fast Cost optimized Vplus Same tone spacing Vectoring possible VDSL2 17a Vectoring Most cost-effective solution for 100Mb/s 25kHz 17.6MHz 30MHz 4.3kHz FREQUENCY SPECTRUM 35MHz optional 6

7 Choosing the right technology 17a Vplus G.fast Vplus (35b) VDSL2 17a vectoring Short loops ( 250m) Medium loops ( 500m) Long loops (>500m) Density (max subs) 400p 200p 16-48p Outside plant costs $ $$ $$$$ Standards draft text available ( 1 ) ( 1 ) Amendment 1 (mandatory) consent targeted for July 2015 G.fast HIGHER RATES HIGHER COST 7

8 Shifting the limits of copper ADSL ADSL ADSL2plus VDSL2 8b VDSL2 17a ADSL2+ VDSL2 8b VDSL2 17a ADSL VDSL2 30a ADSL2+ G.fast 100 MHz VDSL2 8b VDSL2 17a VDSL2 30a G.fast 100 MHz Vplus/35b 35 MHz G.fast 106 MHz bandwidth [MHz] bandwidth [MHz] 8

9 G.fast status - timeline BELL LABS OMEGA-DSL PROJECT G.FAST PROJECT INITIATED IN ITU G.FAST PROOF OF CONCEPT EARLY OPERATOR LAB TESTS PROTOTYPE MORE LAB TESTS EARLY FIELD TESTS 1 ST G.FAST PRODUCTS & LARGER FIELD TRIALS EARLY G.FAST DEPLOYMENTS 9

10 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 Mbit/s for FTTB 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 10

11 G.fast deployment models FTTCurb FTTdp FTTB ~FTTH NEW manhole, mini-cabinet, pole-mount,. CPE CPE CPE CPE CPE CPE multi-port system multi-port DPU multi-port DPU single-port DPU 11

12 Choosing the right technology peak rate G.fast Impact on power consumption? port density reach not standard related VDSL2 17a vectoring group size 12

13 Aggregate bit rate [Mb/s] G.fast trial results G.fast MHz BBF operator target rates trial rates Source: six operator labs loop length [m] 13

14 G.fast field trials 24 G.FAST TESTED WITH 24 OPERATORS 652 Mbit/s US+DS traffic (74m in-house cable) Four Acres test facility 14

15 The numbers are in Vectoring 2.0 makes G.fast faster 2 pairs active in same cable measured MHz MHz 15

16 Crosstalk strongly depends on cable type G.fast MHz 40 pair cable with almost no crosstalk 16

17 G.fast allows for end-user self-installation some (modest) bit rate loss in case of bridged taps in-house bridged tap 2m, 10m, 20m 100m BT length DS loss US loss no 0% 0% 20m -6% -5% 10m -6% -4% 2m -13% -8% Bit rate loss may increase if multiple bridged taps Source: ChuangHwa Telecom Labs (CHT-TL) in cooperation with ALU 17

18 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) Source (PSD figure): BT Labs in cooperation with ALU 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 18

19 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 US DS US DS US TDD frame (e.g. 750 s) M DS M US time All G.fast lines in the same cable need to be synchronized, with the same up/down split In presence of crosstalk Source (bit rate figure): Orange Labs in cooperation with ALU 19

20 Comparing line rate, traffic generator speed & speed test 80% DS - 20% US 60% DS - 40% US 990 Mbps line rate 935 Mbps line rate 910 Mbps traffic generator 811 Mbps speedtest.net speedtest.net: Mbps aggregate Throughput DS US Agg Bandwidth Mbps Utilization % Frame Rate fps 20

21 G.fast/FFTdp status - standards With active participation of 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 (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: 1 st in June 2015, next in Nov ETSI TS V1.2.1 (Requirements for Reverse Powering) approved in Nov 2014 specifies Communication Based Startup (CBSU) New version of TS in preparation will also specify Metallic Detection Based Startup (MDSU) 21

22 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? 22

23 G.fast test parameters G ADSL2plus G VDSL2 G 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 23

24 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) 24

25 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 RMC symbol Sync symbol. time PHY L2+ FTU-O-1 FTU-N Sync Frame TDD Frame #4 TCE LPMode-1 Env. conditions, e.g. temp DRA PCE BAT-1 VCE TXOPds/us-1 FTU: G.fast transceiver unit DRA: dynamic resource allocation PCE: Power Control Entity TCE: Timing Control Entity VCE: Vectoring Control Entity simplified reference model of DPU 25

26 Increasing bandwidth <2.0 Gb/s FM ( ) <1.0 Gb/s analog TV/DAB ( MHz) 106 MHz 159 MHz 212MHz 26

27 FTTdp reverse powering With active participation of 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 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 inhouse installation and DPU If so, lifeline required? battery needs to feed DPU, CPE/RGW, possibly dongles Regulatory aspects? U-R U-R2P PS PSE U-R2 SS CPE RGW PS: power splitter SS: service splitter PA: POTS adaptor U-R2P PS PSE SS CPE RGW PA PA Home LAN PA Home LAN PSE: Power Sourcing Equipment CPE, RGW and/or PSE can be combined in single box U-R2D 27

28 Stretching the limits of copper even further Vplus 35 MHz VDSL2 8b G.fast 106 MHz VDSL2 17a XG-FAST 500 MHz ADSL ADSL2+ VDSL2 8b VDSL2 17a VDSL2 ADSL 30a G.fast ADSL MHz G.fast VDSL b MHz XG-FAST VDSL2 17a VDSL2 30a G.fast 100 MHz G.fast 200 MHz XG-FAST bandwidth [MHz] bandwidth [MHz] 28

29 (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. aggregation 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 29

30 Alcatel-Lucent XG-FAST measured in lab 2 Gb/s over 70m single pair 10 Gb/s over 30m two pairs 2 pairs 10 Gb/s 70m 5 Gb/s CAT5e single pair operator cable 70m 0 Gb/s 30m 50m 70m 30

31 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 1 ST 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 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 31

32 32