G.fast is a communications standard that can deliver fiber-like broadband speeds of up to 2Gbps over short copper loops up to 500m. It uses vectoring to optimize performance. The document discusses how G.fast enables ultra-fast broadband speeds at a lower cost than FTTH with faster deployment over years rather than decades. It also summarizes innovations with G.fast like dynamic time assignment and reverse power feeding.

1. © 2017 Sckipio | Confidential & Proprietary1
THE LATEST IN GFAST
Charles Chiu, Sckipio

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What is G.fast?

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ULTRA FAST BB SPEEDS
2Gbps +
LOWER COST
Comparing to FTTH
FASTER TO DEPLOY
Roll out in years
not decades
Web: #00713c
GB: 0, 113, 60
CMYK: 89, 31, 97, 21
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GB: 123, 193, 67
CMYK: 57, 0, 99, 0
k Green
Green
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GB: 204, 204, 204
CMYK: 19, 15, 16, 0
y Back
Web: #494949
Gray
G fast
™
G fast
G fast
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CERTIFIED
G fast
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CERTIFIED
G fast
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CERTIFIED
G fast
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CERTIFIED
G fas
CERTIFI
G fas
CERTIFI
1)
2) 5)
6)
8)
9)
3)

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What is G.Fast?
•Communications standard (G.9701) that was just approved by the ITU at end of 2014.
•Designed to deliver ultra broadband speeds over short copper loops, up to 500m
•Uses 2MHz-212MHz spectrum that can deliver up to 2Gbps
•Flexible asymmetry ratio (up:down ratio)
•Optimized performance with vectoring

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What is G.Fast?
Central Office
VDSL2
800-1,000 meters
Less than 140Mbps
G.fast Distribution Point
30-400 meters
Up to 2Gbps
Fiber to the Home
Over 1 Kilometer
Over 1Gbps
Fiber
Twisted Pair

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Amendment 1 Amendment 2 Amendment 3
2015 2016 2017
Features:
- 1Gbps
- 2-106Mhz
- 12 bits/tone
- 4dBm transmit power
- Twisted pair only
- Small vectoring densities (16 or
less lines)
Features:
- 1Gbps
- 2-106Mhz
- 14 bits/tone
- 8dBm transmit power
- Twisted pair only
- Larger vectoring densities (48
port)
Features:
- 2Gbps
- 2-212Mhz
- 8dBm transmit power
- Twisted pair and coax
- Larger vectoring densities (48
port)
Web: #00713c
RGB: 0, 113, 60
CMYK: 89, 31, 97, 21
Web: #7bc143
RGB: 123, 193, 67
CMYK: 57, 0, 99, 0
Dark Green
Light Green
Web: #cccccc
RGB: 204, 204, 204
CMYK: 19, 15, 16, 0
Gray Back
Web: #494949
RGB: 73, 73, 73
CMYK: 0, 0, 0, 71
Dark Gray
Web: #9e9e9e
RGB: 158, 158, 158
CMYK: 0, 0, 0, 38
Light Gray
G fast
™
G fast
™
G fast
™
CERTIFIED
G fast
™
CERTIFIED
G fast
™
CERTIFIED
G fast
™
CERTIFIED
G fast
™
CERTIFIED
G fast
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CERTIFIED
G fast
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C ERTIFIED
G fast
™
CERTIFIED
G fast
™
CERTIFIED
1)
2) 5)
6)
7)
8)
9)
10)
3)
4)

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G.FAST IS MORE THAN SPEED
• Significantly lower cost versus FTTH
• Customer self-install
• Faster roll-out (no customer visit coordination)
• Flexible use-cases (wireless & business applications)
• Flexible asymmetry ratio (up:down ratio)
• Coexistent with legacy xDSL
• Much more robust, fiber level quality over copper
• Better power management: Lower power, remote power feeding
• Optimized performance with vectoring

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GFAST GOING FARTHER (2~106MHz, available now)
800
Mbps
100 meters
600Mbps
200 meters
400Mbps
300 meters
250Mbps
400 meters
150Mbps
500 meters
1000
Mbps
Back to Back
Numbers are aggregate
upstream/downstream

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GFAST GOING FASTER (2~212MHz, next year)
1.3Gbps
100 meters
600Mbps
200 meters
400Mbps
300 meters
250Mbps
400 meters
150Mbps
500 meters
2Gbps
Back to Back
Numbers are aggregate
upstream/downstream
Amendment
3
Amendment
3

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GFAST CERTIFICATION UPDATE
• Broadband Forum ID-337
• Targeting
• Compliance
• Interoperability
• Many participants
• Beta program
• Full program

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Innovations

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Industry Innovations
• Dynamic time assignment
• Feels like symmetrical services
• Cascading boxes together
• Pay as you grow
• Bonding
• Achieve 1Gbps today
• Reverse Power Feed (RPF)
• Becoming real
• Next generation chipsets (from multiple vendors)
• Increased performance
• Increased densities

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Stackable DPUs, 64 to 96 Ports Example
G.fast MDU 16 or 24 Ports
212MHz (212a bandplan)(Vectoring Connectors)
G.fast MDU 16 or 24 Ports
212MHz (212a bandplan)(Vectoring Connectors)a
G.fast MDU 16 or 24 Ports
212MHz (212a bandplan)(Vectoring Connectors)
G.fast MDU 16 or 24 Ports
212MHz (212a bandplan)(Vectoring Connectors)
Cross DPU Level
Vectoring (XDLV)

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• DTA is about adapting the DS/US allocation
in a dynamic way based on the actual
traffic requirements
• iDTA
• When there is no cross-talk between the lines
(e.g., coax), each line can adapt it DS/US
allocation independently of the other lines
• cDTA
• When there is cross-talk between the lines
(e.g., TP), all the lines have to use exactly the
same frame structure
DTA variants Explained

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G.Fast vs. VDSL

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Use-cases for Gfast
• Multi-dwelling units (MDU)
• FTTB
• FTTF
• WTTR
• Single Family units
• Fiber extender
• FTTC
• Other opportunities
• Business
• Mobile backhaul
FTTBFTTCab FTTDp

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Indonesia Case for Scalable FTTB
• GPON FTTB+VDSL failed (compared with GPON FTTH) due to few reasons:
• The offered rates of VDSL weren’t future proof compared to fiber
• The MDU equipment CAPEX was high
• Low take rate increased the cost per port
• Local powering increased installation cost
• The MDU equipment OPEX was high
• Battery backup for MDU equipment requires replacement every 2 years
FTTBFTTCab

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FTTB GFAST FIXES ALL FTTB VDSL SHORTCOMINGS
High Scalability
Start with small
port count and
add more as you
grow.
Maintain only one
SKU
Cost optimization
Add second box
only when first
DPU is fully
populated,
maximize take
rate.
Improve OPEX and
CAPEX with RPF
x6
Reverse Power Fed
No need for local
powering in the
basement, no
need to pay
electricity bills, no
need for battery
backup
Gigabit internet
Provide fiber grade
Gbps services
using GFAST 212
profile

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Side By Side Comparison
Future Proof Speeds & Grade of Service
• Offered maximal rates of 100-200 Mbps
• VDSL reliability is significantly Inferior to
fiber (lower noise immunity, long retrain
times, etc)
• Offering fiber speeds –
up to Symmetrical 1 Gbps (with cDTA)
• High reliability –
Modern standard – fast retrains, superb
stability
FTTB + VDSL FTTB + G.fast

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Side By Side Comparison
Cost of SKU Management
• Used to have Multiple SKUs to cover both
small and large buildings.
• When vectoring is required there was no
other choice rather than having all the
ports in the same box (SLV)
• Maintaining each SKU cost money
• Training the technicians on new equipment
• Maintaining inventory for replacement cycles
• Maintaining One SKU only saves OPEX,
technician training and inventory
control.
• The same DPU is used for small and
large MDUs.
Just use as many DPUs as needed.
From 1 to 6.
x6
FTTB + VDSL FTTB + G.fast

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Side By Side Comparison
Optimization of DPU Take Rate
• Stackable DPUs allow you to add more ports
as your grow maintaining high take rate at
all time  resulting with low cost per
subscriber compared with legacy
FTTB+VDSL
96 ports 10 connected
subscribers
10% take rate
62% take rate
96 ports
6 x 16p
Add as you grow
10 connected
subscribers
FTTB + VDSL FTTB + G.fast

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Side By Side Comparison
Reverse Power Feeding Benefits
• VDSL basement equipment couldn’t be
reverse power fed from customer
residences.
• Required provisioning of local power supply in every
building
• Required billing arrangement with the building owner
(adding meter in some cases)
• Cost hundreds of dollars over the deployment cycle on
electricity bills
• Requires local battery back up in case of power cut
• Requires ongoing maintenance and replacement of
batteries
• Huge cost impact (installation, bills,
maintenance)
• No local powering is needed.
• No battery backup is needed.
• No electricity bills.
 All the benefits of passive equipment
(PON) with the ease of installation and
reduced fiber rollout cost of DSL (copper
already exists in building).
FTTB + VDSL FTTB + G.fast

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Summary

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Summary
• G.fast provides fiber-like speed with lower cost and shorter deployment time.
• Stackable DPU provides pay-as-you-grow and expansion to large MDU
• DTA allows efficient bandwidth management