06.davepayne

8/7/2019 06.DavePayne

1/21

Options for Fibre to the Premises in Europe

Dave Payne and Russell Davey

BTexact, Adastral Park, Martlesham Heath, Ipswich, Suffolk, UK


2/21


3/21

Barriers

High upfront capital investment

Civil infrastructure build costs and time

Increased opex costs if legacy not replaced

Uncertain take-up rates

Uncertain revenues from new broadband services


4/21

Bandwidth demand

New services including: video, hdtv etc.

Large file transfer eg. hi-res image & video content, photographs etc.

Mass market network storage services

Distributed servers

Thin client computing

Etc.

Customers need access to high speed pipes

To get low delay, fast file transfer & rapid response time

But they dont need the bandwidth all of the time. Therefore redistribute the unused bandwidth DBA for all services!


5/21

Impatience Index

0%

10%

20%

30%

40%

50%60%

70%

80%

90%

100%

0 5 10 15 20 25 30 35

time to download (Secs)

%

Custom

ersthatw

ait


6/21

Time to transmit files

200ms

1 sec

10 sec

1min

1 hour

8 hours

1 day

10 days

100 days

1 10 100 1,000 10,000 100,000

File size (Mbytes)

Timetotr

ans

mit(secs)

Modem56kb/s

ADSLdo

wn2M

b/s

Postal Service

ADSL

Up0.5

Mb/s

FTTC(V

DSLU

p)3MB

/s

FTTP1

00Mb/s

custport

FTTP1

Gb/scu

stports

Instantaneous

Customers accept delay

Customers get impatient

Delay a major barrier

Physical transport faster!

}}}10 min

DVD HDTVCD


7/21

Todays optical access network options

Point to Point Solutions

Point to point fibre

WDM PON

Active Star

Passive Optical Network:

BPON

GEPON

GPON


8/21

Options for optical access solutions

Big

Business

CustomerLocal Exchange

FTTP

Customers

Cabinet

Non-FTTP

Customers

backhaul/metro

network

Cabinet

Point to point fibre.


9/21


Big

Business


FTTP

Customers

Non-FTTP

Customers

backhaul/metro

network

Point to point fibre.

Cabinet

Active star

Cabinet

Active star


10/21

Cabinet


Big

Business

Customer

MSAN

Non-FTTP

Customers

copper

backhaul/metro

network

FTTP

Customers

WDM PON.

Local Exchange

WDM

Splitter

WDM

Multiplexer


11/21


Point to Point Solutions

Point to point fibre

+ High bandwidth per customer

+ Good security

- Large fibre count cables

- Opex and capex issues

WDM PON

Logical point to point

+ WDM enables some fibre sharing

Active Star

+ Shares feeder fibre

- Active street electronics opex issues

- No bandwidth sharing- Separates access and metro networks- Keeps traditional architectures and cost structure- Keeps electronic nodes - either in exchanges or in street nodes


12/21


Passive Optical Networks: BPON

GEPON

GPON

Today:

+ Infrastructure sharing

+ Passive infrastructure

+ Enables bandwidth sharing

+ Gives some economic advantages

- Limited power budget limits reach and split (sharing)

-Keeps separation of access and metro

Evolution of GPON has most potential


13/21

Cabinet

CabinetMSAN

Early standard version has

limited power budget - limited split

and reach

Options for optical access: GPON

Big

Business


FTTP

Customers

Non-FTTP

Customers

backhaul/metro

network2.5G

b/s

1.25/2.5Gb/

s

+ 2nd generation, standardised PON.

+ high bandwidth per customer+ GEM protocol efficient packet transport

+ Video services could be in payload - IPTV

+ fibre lean

+ Protocol reach and split can

enable some network

restructuring

+ Could also be used for metro

applications.copper

~32 way

split


14/21

The economics of current FTTP solutions do notlook attractive for mass market deployment.

PON solutions are less expensive than Point to

Point.

Can new network architectures enable FTTP to

become economically viable?

Need to consider access and backhaul together.


15/21

Integrated access and backhaul

Cabinet

Big Business

Customer

FTTP

Customers

Non-FTTP

Customers

copper

backhaul/metro

Long reach access.

10Gb/s

2.5/10Gb/s

100km

CabinetMSAN

All ONUs have fixed band-pass blocking filters

which only select the initial operating wavelength and

block all others.

When WDM is added at a later stage the new

ONUs will have a band pass filter at one of the

additional wavelengths

EDFA technology constrains operation

to C band wavelength range

~1000 way split


16/21

Integrated access and backhaul

+ WDM (non tunable)

Cabinet

Big Business

Customer

FTTP

Customers

Non-FTTP

Customers

copper

backhaul/metro

Long reach access.

10Gb/s

2.5/10Gb/s

100km

CabinetMSAN

Customer ONU has fixed blocking

filter to select operating wavelength

All mass market ONUs operate at the

same wavelength.

EDFA technology constrains operation

to C band wavelength range


17/21

Cabinet

Integrated access and backhaul with photonic coreLonger Term Vision Flexible wavelength assignment & DBA

Big

Business

Customer

FTTP

Customers

Tunable & self install ONU (for residential customers)

backhaul/metro

Long reach access.

10Gb/s

10Gb/s

Network Reduced to ~100 exchange

Intelligent

Photonic Inner

core Network

Metro

nodes

Opticalswitches

copper

Cabinet

MSAN

Power splitter (not

WDM splitter) to

enable any or

combination of s

to any customer

New amplifier technology (e.g. quantum

dot) enables operation across all the fibre

spectrum


18/21

Evolution scenario of BT network


19/21

Operational & Environmental Benefits

21C MSAN

20 racks

50-100 kw

Long Reach PON


20/21

Amplified GPON

Adding amplifiers to GPON can be an interim solution for LR-PON

ONU

ONU

ONU

ONU

4x32-way

Split

OLT1aTx

Rx4

X

4OLT1a

Tx

Rx

60km

128-way total split


21/21

Conclusions

A number of powerful drivers make it inevitable that Europe willengage in large scale roll out of FTTP at some time in the future.

It is likely that a number of the existing FTTP solutions may be

deployed on a small scale for tactical reasons.

The economic viability of these existing solution for large scale

roll out are questionable.

We propose that a much more radical solution is required that

changes the economic structure of networks.

A possible solution is Long Reach Access which significantly

reduce capital costs and has potential for huge opex savings. An intermediate step could be amplified GPON.

06.davepayne

Documents