Transcript IMTC H.323 Forum Launch - ITU

Broadband and Gigabit Optical
Access Technologies and Unbundling
Strategies
Presented by:
Paolo ROSA
Counsellor – ITU-T Study Group 15
Optical and other transport networks
ITU-T
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Arab CoE Workshop on DSL Technologies and Applications – Cairo, 4 - 6 March 2003
Contents
o Optical access network architecture
o Passive optical networks
o Regulatory aspects: Unbundling
o Conclusions
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Arab CoE Workshop on DSL Technologies and Applications – Cairo, 4 - 6 March 2003
Optical Access Network Architecture
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Arab CoE Workshop on DSL Technologies and Applications – Cairo, 4 - 6 March 2003
Optical access network architecture (G.983.1)
Optical Distribution Network
FTTH
O
N
U
Fibre
Copper
FTTB/C
N
T
O
N
U
HOME
N
T
Copper
Fibre
O
L
T
Fibre
O
N
U
FTTCab
Access network
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Arab CoE Workshop on DSL Technologies and Applications – Cairo, 4 - 6 March 2003
SNI
PON Access System
Access Node
ONU
OPT
Splitter
BB O O
X L
C
T
NB
l 1310nm
ONU
1:32
l 1530 nm
ONU
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l +/- 50 nm
ONU
Arab CoE Workshop on DSL Technologies and Applications – Cairo, 4 - 6 March 2003
Optical Systems for Access Networks
Market & Business Drivers (1)
o Getting PSTN, data and cable TV together on
one system at competitive prices (convergence)
o Fibre To The Home (FTTH), to the Curb (HTTC)
to the Business (HTTB) are the next step for
many operators (very high bandwidth)
o The major change is driven by the explosive
growth of the Internet usage (users demand)
o Public and private networks evolve from multiple
overlay networks to a unified network platform
able to carry multiple applications (services)
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Arab CoE Workshop on DSL Technologies and Applications – Cairo, 4 - 6 March 2003
Optical Systems for Access Networks
Market & Business Drivers (2)
o IP routers and ATM switches are providing
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higher and higher speed optical interfaces
o Major carriers are realizing that services at STM16 (2.5 Gbit/s) and optical pipes may well
represent more than 50% of the bulk bandwidth
entering networks in the near future
o The new high speed data requirements are
requiring a new category of Wavelength
Services (WDM/extended optical bands)
o These new services will require new networking
functions (performance monitoring, fault
localization, network restoration, etc)
Arab CoE Workshop on DSL Technologies and Applications – Cairo, 4 - 6 March 2003
Key aspects for optical technologies
o
o
o
o
o
o
o
o
o
o
o
o
o
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IP over optical, business and market aspects
Switched optical networks
Optics in access and metropolitan networks
Optical interfaces
Optical/IP network OAM and protection and restoration
WDM and Coarse & Dense-WDM
Signalling and routing
Optical fibres, cables and components
Optical network management
Optical switching equipment
Network performance (IP/Optical)
Optical network clients and services
Services and network evaluation
 Making fully-optical networks viable
Arab CoE Workshop on DSL Technologies and Applications – Cairo, 4 - 6 March 2003
OTN Structure and Technology
o Optical Transport Network (OTN) structure
•
•
•
•
Automatic Switched Optical Network (ASON)
Architecture and interfaces for the OTN
Optical Cross-Connect and Switch functions
Network management and control
o OTN technology (terrestrial and submarine)
• Coarse and Dense WDM, STM-256 / 40 Gbit/s signal
channels
• Optical components & amplifiers (e.g. tunable filters)
• Fiber characteristics, more channels/fiber
• long reach
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Arab CoE Workshop on DSL Technologies and Applications – Cairo, 4 - 6 March 2003
Evolution of Standardization – Systems
G.692
622 Mbit/s – 10 Gbit/s
(STM-4 to STM-16)
WDM 4 to 32 ch
Long. Compat.
Line amplifiers
mono/bidirect.
1996 / 1998
G.959.1
2.5 and 10 Gbit/s
Pre-OTN
Single /WDM
Transv Compat.
Term. OAs
Id Interfaces
2000
Up to 16 channels
WDM
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G.693
10 – 40 Gbit/s
(STM-64 to STM-256)
Single channel
Transv. Compat.
Intra office
2001
G.694.1
G.694.2
≥ 80 Ch/10 Gbit/s
Up to 18 Ch/2.5 Gbit/s
Dense WDM
Coarse WDM
2002
Arab CoE Workshop on DSL Technologies and Applications – Cairo, 4 - 6 March 2003
OTN Standardization Work Plan
Global Optical Transport Network
Supporting Today's and Future Services
OTN
IrDI
USER
NE
OTN
IaDI
OTN
NE
OTN
NE
OTN
IaDI
OTN
IaDI
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USER
NE
OTN
NE
Carrier Domain A
User/carrier may
originate/terminate
the OTN framing
for any digital
payload
(IP, ATM, SDH,,,)
OTN
IrDI
SDH
STM-N
Carrier Domain B
IaDI = Intra-Domain Interface
IrDI = Inter-Domain Interface
NE = Network Element
Interfaces:
For
single/multichannels
with
performance monitoring
Arab CoE Workshop on DSL Technologies and Applications – Cairo, 4 - 6 March 2003
Passive Optical Networks
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Arab CoE Workshop on DSL Technologies and Applications – Cairo, 4 - 6 March 2003
Optical systems for access networks
Broadband PON: G.983.x-series Recs.
o Passive Optical Network up to 622 Mbit/s symmetrical /
asymmetrical
o Supports wide range of narrow- & broadband services like:
• PSTN / ISDN / Multiple Line
• Data / LAN interconnection / High speed Internet (~100 Mbit/s)
• Cable TV / Video on demand (up to 400 TV channels on single
wavelength)
• Videoconferencing
o Independent from bit rates, signal formats (digital or
analogue, SONET/SDH etc.) and protocols (IP, Ethernet,
ATM etc.)
o Need to deploy only the equipment at the ends of the
network as needed to add new services to existing
customers or to add new customers.
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Arab CoE Workshop on DSL Technologies and Applications – Cairo, 4 - 6 March 2003
WDM Spectral bands (proposal)
Definition for classification and not specification purposes
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Band
Descriptor
Range (nm)
O-band
Original
1260 to 1360
E-band
Extended
1360 to 1460
S-band
Short Wavelength
1460 to 1530
C-band
Conventional
1530 to 1565
L-band
Long Wavelength
1565 to 1625
U-band
Ultra-long
wavelength
1625 to 1675
Arab CoE Workshop on DSL Technologies and Applications – Cairo, 4 - 6 March 2003
Recommendation G.983.1
o Systems supported:
• symmetrical line rates of 155.520 Mbit/s
• asymmetrical line rates of 155.520 Mbit/s
upstream and 622.080 Mbit/s downstream.
o Transmission type:
• Bidirectional - 1 fibre - WDM technique
(1.3 mm upstream and 1.5 mm downstream) or
• Unidirectional 2 fibres in 1.3 mm region (both
down and upstream)
• Reach at least 20 km
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Arab CoE Workshop on DSL Technologies and Applications – Cairo, 4 - 6 March 2003
Recommendation G.983.3
(Enhancement band)
o Defines new wavelength allocations to distribute
o
o
o
o
o
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WDM and additional service signals simultaneously.
Allows distribution of video broadcast services or
data services without disturbing basic ATM-PON
system
Potentially provides unidirectional and bidirectional services.
New reference points and optical interface
parameters for new WDM and/or optical power
splitter/combining functions at OLT and/or ONU
sites.
Full compatibility with the G.982 and G.983.1.
Central frequencies  Recs. G.959.1 and G.692
Arab CoE Workshop on DSL Technologies and Applications – Cairo, 4 - 6 March 2003
G.983.3 wavelength allocation
1.3 mm wavelength band (Upstream)
G983.1 Upstream Band
G983.1
ATM
PON Upstream
Band
(
unchanged at 100
nm bandpass )
(unchanged at 100 nm bandpass)
1260
1280
1300
1340
1320
1360
Intermediate wavelength band (Upstream and/or Downstream)
Guard band
1360
Reserved
Reserved for
for allocation
allocation by
byITU
ITU
1380
1400
1420
Guard band
-T
1440
1460
1480
1.5 mm wavelength band (Upstream and/or Downstream)
Basic Band
Enhancement Band
Constrained
ATM - PON
ATM-PON
WDM
Video/Dig
Guard band
Future L Band
Reserved for
allocation by ITU
Guard band
Downstream
Downstream
l
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l
1
l
2
3
G.983.1 downstream
l1 – l2 = 1480 – 1500 nm
l3 - l4 = 1539 – 1565 nm
(WDM G.959.1 central freq.)
l
4
-T
l
5
Upstream Window (no change)
Basic Band (constrained APON band)
Enhancement Band (other uses)
For future use
Arab CoE Workshop on DSL Technologies and Applications – Cairo, 4 - 6 March 2003
l
6
G.983.4 – Dynamic Bandwidth Assignment
o Improves efficiency of upstream
o Adjust bandwidth among Optical Network Units
o
o
o
o
o
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in response to bursty traffic requirements
More customers to the PON
More efficient utilization
Possibility of enhanced services (BW peaks)
beyond the fixed allocation
Symmetrical 155 Mbit/s
Asymmetrical up 155 Mbit/s down 622 Mbit/s
Arab CoE Workshop on DSL Technologies and Applications – Cairo, 4 - 6 March 2003
Optical systems for access networks
G.984.x -series Recs (G-PON) – (01-2003)
New!
o Gbit/s capable PON systems
o Symmetrical/Asymmetrical
o 1.244 and 2.488 Gbit/s downstream
o 155 Mbit/s up to 2.488 Gbit/s upstream
o Business and residential users
o Convenient support of IP and Ethernet
o Same wavelength plan and full-network design
principles as in G.983.x-series
(B-PON)
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Arab CoE Workshop on DSL Technologies and Applications – Cairo, 4 - 6 March 2003
G.984.1 – General Characteristics of
Gigabit-capable PONs
Describes flexible optical fibre access
networks capable of supporting the
bandwidth requirements of business and
residential services
G.984.2 –Gigabit-capable PONs:
Physical media dependent layer
specification
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General characteristics of a G-PON such as
architecture, bit rates, reach etc.
Arab CoE Workshop on DSL Technologies and Applications – Cairo, 4 - 6 March 2003
G-PONs (1)
o Bit Rate: 7 transmission speed combinations
o
o
o
o
o
o
o
155 Mb/s up, 1.2 Gbit/s down
622 Mb/s up, 1.2 Gbit/s down
1.2 Gb/s up, 1.2 Gbit/s down
155Mb/s up, 2.4Gbit/s down
622 Mb/s up, 2.4 Gbit/s down
1.2 Gb/s up, 2.4 Gbit/s down
2.4 Gb/s up, 2.4 Gbit/s down
o Max Reach:
o 20 km for less than 1.25 Gbit/s
o 10 km for 1.25 Gbit/s and
o Split ratio: up to 1: 32 (64) , optical power
implications, operators convenience, bidirectional
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Arab CoE Workshop on DSL Technologies and Applications – Cairo, 4 - 6 March 2003
G.PONs (2)
Improved interoperability – One-to-Many
Symmetric/Asymmetric
Backward compatibility to G.983.1
Fast start-up for initialization
Increased network capacity
More efficient IP and ethernet handling
Video-on-demand, streamed video, games,
voice over IP, distance learning, telemedicine
o Less expensive, more reliable
o VDSL, other xDSL backhaul
o
o
o
o
o
o
o
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Arab CoE Workshop on DSL Technologies and Applications – Cairo, 4 - 6 March 2003
G-PONs (3)
Operating wavelengths
o Downstream direction
• single fibre systems shall be 1480 - 1500 nm.
• two fibre systems shall be 1260 - 1360 nm.
o Upstream direction
• The operating wavelength range for the
upstream direction shall be 1 260 - 1 360 nm.
Physical/Optical parameters
o fibres, lasers, detectors, Pin, sensitivity, margins
etc, in G.984.2
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Arab CoE Workshop on DSL Technologies and Applications – Cairo, 4 - 6 March 2003
Metropolitan Optical Network
o Short to medium length distances in metropolitan
areas. Typically:
o within limits of a single optical span
o often less than 200km distance.
o signal regeneration, in-line amplification and error
correction are of lesser importance than in Long
Haul Optical Networks
o Maximized coverage commensurate with low cost
connectivity
o Combined with the wider variety of client signals is a
key driver for flexible aggregation (e.g., 100Mb-1Gb
rate), higher bandwidth interfaces for inter office
o Bandwidth-on-demand services, and multiple classesof-services leading to further topology and technical
considerations.
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Arab CoE Workshop on DSL Technologies and Applications – Cairo, 4 - 6 March 2003
MON topology
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Arab CoE Workshop on DSL Technologies and Applications – Cairo, 4 - 6 March 2003
Regulatory Aspects :
UNBUNDLING
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Arab CoE Workshop on DSL Technologies and Applications – Cairo, 4 - 6 March 2003
Regulatory Challenges
Underground
Overhead
Feed
Feed
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Arab CoE Workshop on DSL Technologies and Applications – Cairo, 4 - 6 March 2003
Unbundling of NE Issues
oLaws permitting competition among traditional
incumbent operators and Other Licensed
Operators (OLOs)
o“Co-location” of Incumbents and OLOs in the
same buildings, using same network and
infrastructure
Regulators
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Establish that parts of the network
be shared by operators in a
transparent process to the users
Arab CoE Workshop on DSL Technologies and Applications – Cairo, 4 - 6 March 2003
Regulatory implications
o Despite low levels of access, unbundling
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pertinent to Dev Countries
oNew economy and information society
dependent on access to Bandwidth
oDepending on the quality of the copper network
other physical media to be considered (optical,
wireless)
oSound infrastructure planning and innovative
regulation to provide equitable access
oLocal operators to become globally competitive
oConvergence Telecom/TV broadcasting for
access
Arab CoE Workshop on DSL Technologies and Applications – Cairo, 4 - 6 March 2003
Incumbent’s Central Office
Full unbundling




Local
Loop
Higher
band

MDF

Local
Loop

Local
Loop
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


S
p
l
i
t
t
e
r
s
Lower
band
OLO
network

DSLAM
OLO

Line
sharing
Colocation area

Bit
stream


Higher
band

Lower
band


DSLAM
(incumbent)



Arab CoE Workshop on DSL Technologies and Applications – Cairo, 4 - 6 March 2003
Incumbent
network

Local Loop Unbundling (LLU)
o Process where the incumbent operator makes its
local network (the copper cables that run from
customers premises to the telephone exchange)
available to other companies.
o Operators are then able to upgrade individual
lines using DSL technology to offer services such
as always on high speed Internet access, direct
to the customer.
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Arab CoE Workshop on DSL Technologies and Applications – Cairo, 4 - 6 March 2003
Full Loop Unbundling Co-location
Before
Main Distr.
Frame
After
Primary Conn.
Point
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Incumbent
Co-location
Handover Distr
Frame
Main Distr.
Frame
Arab CoE Workshop on DSL Technologies and Applications – Cairo, 4 - 6 March 2003
OLO
Incumbent
Distant Co-location
Main Distr.
Frame
Incumbent
Premises
Distant Co-location
Primary Conn.
Point
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Handover Distr
Frame
Arab CoE Workshop on DSL Technologies and Applications – Cairo, 4 - 6 March 2003
OLO
Premises
Sub-Loop and Line sharing
OLO
Cabinet
Co-location
Handover Distr
Frame
Primary Conn.
Point
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Main Distr.
Frame
Arab CoE Workshop on DSL Technologies and Applications – Cairo, 4 - 6 March 2003
OLO
Incumbent
Spectrum Management (1)
(copper access)
o Factors to be considered
• Spectral density
• ISDN
40 KHz
• HDSL
150 KHz
• ADSL
300 KHz
• Frequency spectrum from zero (POTS) to
tens of MHz(VDSL)
• Different line codes
• Compatibility
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Arab CoE Workshop on DSL Technologies and Applications – Cairo, 4 - 6 March 2003
Spectrum Management (2)
(copper access)
o Cohesistence in the same binder group of
different transmission systems
o Minimize impairement
•
•
•
•
limiting number of systems
position in the binder
POTS / ISDN ok 100%
xDSL systems limited in number and
types to avoid crosstalk and impairement
of quality of transmission
• Rules for Incumbents and OLOs
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Arab CoE Workshop on DSL Technologies and Applications – Cairo, 4 - 6 March 2003
Conclusions
o Technologies allow new services
o Actors:
•
•
•
•
Service providers (ISPs)
Manufacturers
Customers
Operating companies
o Competition
o Need of rules to guarantee access to
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everybody, everywhere at a reasonable
price and with a stated Quality of Service
Arab CoE Workshop on DSL Technologies and Applications – Cairo, 4 - 6 March 2003
Conclusion
Underground
Overhead
Feed
Feed
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Arab CoE Workshop on DSL Technologies and Applications – Cairo, 4 - 6 March 2003
Thank you for your attention!
For further information,
please feel free to contact:
Counsellor for SG 15: Paolo Rosa
[email protected]
Tel: +41-22-730-5235 Fax: +41-22-730-5853
http://www.itu.int/ITU-T
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Arab CoE Workshop on DSL Technologies and Applications – Cairo, 4 - 6 March 2003