Open Forum 2015 - NICC Standards · 2019-03-05 · shown as VDSL35b Spectrum extended beyond the...

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09/11/2015 NICC Standards Limited Open Forum 2015 11 th November 2015

Transcript of Open Forum 2015 - NICC Standards · 2019-03-05 · shown as VDSL35b Spectrum extended beyond the...

Page 4: Open Forum 2015 - NICC Standards · 2019-03-05 · shown as VDSL35b Spectrum extended beyond the normal 30MHz to 35MHz VDSL35b improves on current 17MHz VDSL But G.fast vastly outperforms

09/11/2015 NICC Standards LimitedNICC Standards Limited

● 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 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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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

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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