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09/11/2015 NICC Standards Limited
Open Forum 2015
11th November 2015
09/11/2015 NICC Standards LimitedNICC Standards Limited
NICC DSL TG
Gigabit G.fast DSL technology
Kevin Foster CEng. FIETGM Architecture, Innovation and Engineering, BTBroadband Forum ChairmanNICC DSL Task Group Chairman
11 November 2015
09/11/2015 NICC Standards LimitedNICC Standards Limited
Outline
● What is G.fast
● The key standards
● G.fast vs VDSL
● Future innovations
● Certification and interoperability
● Questions
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● The latest in a long line of Digital Subscriber Line (DSL) technologies
● Digital transceiver designed for operation on twisted copper pairs in the metallic access network
● Specified by ITU-T in G.9701
● Capable of Gibabit/s speeds
● Incorporates the learning from previous DSL technologies
What is G.fast?
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G.fast and FTTDP
Radialdistribution
Exchange
Exchangemanhole
MDF
PCP SCP
Underground cable
E-Side D-Side
DP
Overheaddistribution
G.fast was originally designed to be the DSL technology that enables FTTDP to deliver Gigabit/s speeds over the D-side network
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G.fast in a new architecture
ExchangeTyp 3.5km length~5.6k locations
CabinetTyp 350m length~90k locations
Distribution Point
Typ 35m length~4M locations
Home/Business~29M locations
Push the G.fast unit (DPU) further back in the network to create better economics and reduced scale logistics
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G.fast in a new architecture
Radialdistribution
Exchange
Exchangemanhole
MDF
PCP SCP
Underground cable
E-Side D-Side
DP
Overheaddistribution
G.fast becomes both a FTTDP and FTTC copper DSL technology to deliver Gigabit/s speeds over the D-side network
09/11/2015 NICC Standards Limited
What’s different about G.fast?
Parameter VDSL2 G.Fast
Modulation DMT DMT
Tone spacing 4.3125kHz 51.75kHz
# of Tones 4096 2048
Bandwidth 17MHz 106MHz
Maximum bits per tone 15 12
Maximum Power +14.5dBm +4dBm
Max PSD -55dBm/Hz -65dBm/Hz to 30MHz-76dBm at 106MHz
Duplexing Scheme FDD TDD
Maximum aggregate bandwidth 150Mbit/s 1Gbit/s
Vectoring Optional Mandatory
Re-Transmission Optional Mandatory
SRA/FRA Optional Mandatory
17 MHz72 30 106
Power
spectral density
ADSL2+
VDSL band plan 1
VDSL band plan 2
30MHz VDSL
G.fast
VDSL uses 4.3kHz tones
G.fast uses 51.7kHz tones
Frequency
Tone structure
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Up/down flexibilty
● G.fast uses Time Division Duplexing (TDD)
● 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
DS DS US
MUSMDS
time
TDD frame(e.g. 750s)
USUS
Source: ALU/Orange, TNO Ultrafast conference June 2015
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● G.fast uses frequencies up to 106MHz (and possibly up to 212MHz in future)
● The power spectral density is defined in ITU-T G.9700 and the transceiver in G.9701
● Spectral compatibility with other technologies is key
● Flexibility to shape and notch the G.fast spectrum is provided
● The NICC DSL TG is using these two core ITU-T specifications to underpin the work on defining the spectrum for G.fast in the UK via the BT Access Network Frequency Plan (ND1602)
The signal spectrum used
09/11/2015 NICC Standards Limited
G.fast spectrum
• Differential mode PSD limits are defined in G.9700
• The limits exist for EMC purposes and to limit NEXT and FEXT in the multi-pair access environment
• These limits were approved by the ITU-T in co-operation with ITU-R
• Early technology will use the 106MHz profile
Source: ITU-T G.9700
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Spectrum compatibility
G.fast can operate over the frequency spectrum from 2MHz to 106MHz
As this overlaps with the VDSL2 spectrum (0.14 to 17.7MHz) it is essential to preserve spectrum compatibility to avoid interference between VDSL2 and G.fast signals operating in the same cable binders
This can be achieved by starting the G.fast spectrum at ~20MHz, well above the upper frequency of VDSL2
More complex techniques will develop allow spectrum overlap and increased G.fastperformance, and NICC DSL TG is studying these
VDSL G.fast
17.7 ~20 106 MHz
Guard Band
0.14
PowerSpectral Density
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Implications for G.fast
Key enabling developments Enable higher bits per tone
Improve the receiver sensitivity (noise floor)
Increase the transmit power
Optimise the frequency usage with VDSL
Increased vectoring group sizes
Key implications G.fast must deliver speeds over longer distances ~ 350m (0.5mm Cu)
G.fast units must have a higher DPU port density (typically 48/96 ports)
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VDSL vs G.fast
Simulated performance of 17 and 35MHz VDSL and G.fast starting at 2 and 20MHz and extending to 106MHz
Enhanced VDSL is shown as VDSL35b
Spectrum extended beyond the normal 30MHz to 35MHz
VDSL35b improves on current 17MHz VDSL
But G.fast vastly outperforms VDSL35b on loops up to 300-400m 0 100 200 300 400 500 600
0
100
200
300
400
500
600
700
800
900
1000
Loop length [m]
Bit-R
ate
[M
bps]
Downstream Rate/Reach
G.fast, 20-106
VDSL 35b
VDSL 17a
G.fast, 2-106
Source:
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ITU-T• Rec G.9700 “Fast access to subscriber terminals (G.fast) – Power spectral density
specification”, 04/2014• Rec G.9701 “Fast access to Subscriber Terminal (FAST) – Physical layer
specification”, 12/2014• Rec G.997.2 “Physical layer management for G.fast transceivers ”, 05/15
Broadband Forum (BBF)• TR-301 Architecture and Requirements for Fiber to the Distribution Point, 08/15• ID-337 FAST Certification Test Plan (member only)• TR-285 Copper Transmission Models for testing above 30 MHz, 02/15
NICC DSL TG• ND1602 Specification of the Access Network Frequency Plan applicable to
transmission systems connected to the BT Access Network
Key G.fast standards
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Broadband Forum
Broadband User Services
Architecture and Migration
Fiber to the Distribution Point
Fiber Access Networks
Routing and Transport
Physical Layer Transmission
SDN and NFV
Converged Wireless-Wireline
Work Areas
Software, Data Models, APIs, OAM, Interop Testing & Certification
BBF Contributions Impact and Influence all parts of the Broadband Network
Enterprise/Govt.
SMB & Multi-Tenant
Residential Users
Mobile and Wi-Fi Users
Multi-TenantWired/Wi-Fi
Multiple Service Provider
DomainsBackhaul/RAN
Metro
Core/Transit
Access/Cell/ON/Fixed wireless
Customer Premise/LAN
IoT
= Distributed “Data Center” Cloud/CoLo/App store
InternetContent DeliveryFixed/Mobile
phone
Broadband Inter- and Intra- Connectivity Landscape
200 published standards | 150+ providers & NEMs for 24 years | 1400 tech contributions in last 12 months
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G.fast business accelerators
• Avoids extensive provider testing before purchase
• Significantly reduces costs and accelerates time revenue for all stakeholders
• Creates a trusted industry standard for implementation and high customer satisfaction
Certification
Interoperability plug-fests
Provide an invaluable accelerator to product and
service introduction
Leverages vast experience
and expertise
Promotes open sourcing
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G.fast Certification Program Updates
• The beta program for the G.fast Certification underway, >10 companies
• The beta program is expected to be completed in Q1 2016
• Formal Certification Program will then launch and first certified products announced
Broadband Forum and G.fast
G.fast Interoperability Plug fests
• First G.fast chipset plug fest hosted January 2015
• First System Integrator (real products) plug fest hosted June 2015
• System Integrator plug fest scheduled for 11/15, more in 1/16, 3/16
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Broadband Forum and G.fast
Work In Progress
• WT-355 YANG modules for FTTDP management
• WT-301 Issue 2 Updates to management architectures
Work Completed
• TR-301 The general description and requirements for a deployment architecture leveraging G.fast
• TR-285 Copper cable models, required for testing G.fast systems
• ID-337 G.fast Certification Test Plan (draft available to members)
• OD-362 G.fast Certification Requirements and Rules
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● G.fast is the latest in a long line of DSL technologies● It benefits from the collective learning and experience from
world-wide DSL deployments● The ITU-T specified the physical layer transceiver● The Broadband Forum specified the architecture and is now
accelerating G.fast interoperability● NICC is specifying the spectrum for UK deployment to ensure
spectral compatibility
● G.fast is a true Gigabit DSL technology which will have profound impact in the UK access network
● Further developments will enhance this exciting technology
Summary
09/11/2015 NICC Standards Limited
Thank you
Questions?