g.fast for fttdp
DESCRIPTION
Joint ITU/IEEE Workshop on Ethernet - Emerging Applications and Technologies. G.fast for FTTdp. Les Brown, Associate Rapporteur G.fast Lantiq, Germany. Overview. What is FTTdp? FTTdp/G.fast “raison d’être” Applications Service provider requirements G.fast key features - PowerPoint PPT PresentationTRANSCRIPT
Geneva, Switzerland, 22 September 2012
G.fast for FTTdp
Les Brown,Associate Rapporteur G.fast
Lantiq, Germany
Joint ITU/IEEE Workshop on Ethernet - Emerging Applications and Technologies
Geneva, Switzerland, 22 September 2012
2
Overview
What is FTTdp?FTTdp/G.fast “raison d’être”ApplicationsService provider requirementsG.fast key featuresStandards time-lineStandards body coöperationBackup material
Geneva, Switzerland, 22 September 2012
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What is FTTdp ?
A broadband access solution taking fibre to a distribution point (FTTdp) very close to the customers premises, with total wire length to the customers’ transceiver up to 250m.
It is expected that the bulk of the loop lengths may be in the order 30 to 50m. On 30 m loops, aggregate data rates up to at least 500 Mb/s should be supported on a single pair.
Geneva, Switzerland, 22 September 2012
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FTTdp/G.fast “raison d’être”
To provide the best aspects of ‘Fibre to the home’ and ‘ADSL’:
Fibre to the home bit-ratescustomer self-installation like ADSL
Geneva, Switzerland, 22 September 2012
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Applications
Next-generation IPTV service at well over 100 Mb/sAccess to small and medium business sites at well over 100 Mb/sBackhaul for very small wireless cell sites, including HetNetBackhaul for WiFi hot spots
Geneva, Switzerland, 22 September 2012
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Service provider requirements (1/6)
Low Power/Cost/ComplexityReverse power feed for the remote device from the customers’ residential gatewayMandatory customer self install
triple-play services with home network bridge taps, on loops up to 200m
Geneva, Switzerland, 22 September 2012
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Service provider requirements (2/6)
Zero Touch OAMTo provide for remote management of user connections – for connecting of new users or switching users to or from legacy exchange or cabinet hosted services)
Node sizes typically 1 to 16 portsSupport for exchange and derived POTS
Geneva, Switzerland, 22 September 2012
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Service provider requirements (3/6)
Service rate performance targets500-1000 Mb/s for FTTB deployments @<100m, straight loops500 Mb/s at 100m200 Mb/s at 200m150 Mb/s at 250mAggregate service rates ≥500 Mb/s with start frequency of 23 MHz and VHF and DAB bands notches
Geneva, Switzerland, 22 September 2012
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Capacity vs. Max Bandwidth in AWGN=-140 dBm/Hz (100% crosstalk cancellation)
Service provider requirements (4/6)
Geneva, Switzerland, 22 September 2012
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Service provider requirements (5/6)
Control of downstream/upstream asymmetry ratio
Mandatory: 90/10 to 50/50Optional: from 50/50 to 10/90
Interoperability with VDSL2Coexistence with xDSL
Start frequency: 2.2, 8.5, 17.664, and 30 MHz
Geneva, Switzerland, 22 September 2012
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Coexistence with xDSL: VDSL2 to G.fast migration
Service provider requirements (6/6)
Geneva, Switzerland, 22 September 2012
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G.fast key features (1/4)Duplexing method: TDD
Can easily vary DS/US asymmetry ratioEasily supports low-power statesDiscontinuous mode allows trade-off of throughput vs. power consumptionPoint-to-point distribution (no TDMA)
Downstream transmission opportunity
Upstream transmission opportunity
Tg2
Frame
time
Tg1Tds Tus
Downstream-upstream-guard-time Upstream-downstream-guard-time
Geneva, Switzerland, 22 September 2012
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G.fast key features (2/4)Bandwidth: ≈ 100 MHzModulation: DMT, 2048 sub-carriers, sub-carrier spacing 51.75 kHz, ≤12 bits/sub-carrierPHY layer retransmission
improved robustness against impulsive noise while maintaining low latency
Mandatory support for vectoringFar-end crosstalk (FEXT) cancellation
Geneva, Switzerland, 22 September 2012
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G.fast key features (3/4)FEC: Trellis code + Reed Solomon of VDSL2 (G.993.2) with the retransmission block (DTU) interleaving defined in G.998.4Will provide transport of network timing (8 kHz NTR) and Time of Day (ToD)
Geneva, Switzerland, 22 September 2012
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G.fast key features (4/4)Intended to operate over loops up to approximately 250 m of 24 AWG (0.5 mm) wire pair
VDSL2 is approximately 2500 metres of 26 AWG (0.4 mm)
Support for both TR-156 and TR-167 Broadband Forum architectures
Geneva, Switzerland, 22 September 2012
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Standards time-lineSeptember 2010: Broadband Forum (BBF) Service Provider Action Council (SPAC) agreed to develop a white paper capturing network operators’ potential requirements.January 2011: At request of BBF, ITU-T Q4/15 agreed to study the transceiver aspects of FTTdp, and issued a call for papers.February 2011: Q4/15 opened G.fast project and assigned an Associate Rapporteur/EditorJune 2011: Q4/15 agreed to develop a new RecommendationJuly 2012: agreed to a goal to Consent the G.fast standard in July, 2013Expect an approve standard March, 2014
Geneva, Switzerland, 22 September 2012
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Standards body coöperationClose coöperation between standards groups is needed:
ITU-T Q4/15 for G.fast transceiver aspectsITU-T Q2/15 for PON related aspectsBroadband Forum (FAN and E2E Architecture WGs) for architectural aspects, andETSI TM6 for reverse power feeding aspects
Geneva, Switzerland, 22 September 2012
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The endThank you
Geneva, Switzerland, 22 September 2012
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Backup material
Geneva, Switzerland, 22 September 2012
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Broadband Forum ArchitecturesC
PE
CP
E
CP
E…
CP
E
CP
E
CP
E…
…DP
OLT
ONU
Switch
FTU-O
DP
TR-167 Model(PON-fed Access Node)
CP
E
CP
E
CP
E…
CP
E
CP
E
CP
E…
…DP
OLT
ONU
FTU-O
DP
TR-156 Model(OLT+ONU=Access Node)
Switching & Shaping
Ethernet…
…
Geneva, Switzerland, 22 September 2012
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Detailed TR-156 Architecture (Downstream)
CP
E
CP
E
CP
E…
CP
E-1
CP
E-N…
…DP
OLT
DP
Switching & Shaping
PacketGEMPort ID
GEM Frame
Switch by GEM port ID
Q Q Q QPriority
Scheduler
Q Q Q QPriority
Scheduler
…1 N…
ONU
FTU-O
Geneva, Switzerland, 22 September 2012
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Reference model of FTTdp deployment
OLT ODN
PHY L2+
FTU-R-1
L2+
PHY
U-O
V
FTU-O moduleAccess Node
NT-1
T/SU-R
Q
ME
NMS
G
FTU-O-1
ME
Geneva, Switzerland, 22 September 2012
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Reference model of an FTU‑O module
STREAMus-1DBRus-1
STREAMds-1
TCE
DBA
VCE
NTR/ToD
TDD-timing
FCTLds-1
ME
DBRds-1
TXOPds-1TXOPus-1
Freq/Time in 1588Freq/Time from PHY
ε-1-n
STREAM-BC-1
γ-m
FTU-O-1FTU-O module contains N transceivers,
FTU-O-n, n=1…N
L2+PHY
R/S U-Oγ-O
ε-mTCE-mDBA-m
ε-c-1
FTU-O module
VCE=vectoring control entity, TCE=timing control entity, DBA=dynamic bandwidth allocation
Geneva, Switzerland, 22 September 2012
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Reference model of an FTU‑R module
STREAM-BCDBRus
STREAMus
TCE
NTR/ToD
FCTLus
ME
Freq/Time in 1588Freq/Time to PHY
γ-m
FTU-R
L2+PHY
TU-R
γ-R
TCE-m
STREAMds
NT