ITU-TITU-TSG15SG15
ITU-T Standardization Seminar – Madrid, 12-13 December 2002
Optical and xDSL Access work in ITU-T Study Group 15
Presented by:Simão Ferraz de Campos Neto
Counsellor – ITU-T Study Group 16Multimedia Services, Systems and
Terminals
ITU-TITU-TSG15SG15
ITU-T Standardization Seminar – Madrid, 12-13 December 2002
Contents
o About ITU-T SG 15
o Optical Access
o xDSL Access
o Other access technologies
ITU-TITU-TSG15SG15
ITU-T Standardization Seminar – Madrid, 12-13 December 2002
About Study Group 15
ITU-TITU-TSG15SG15
ITU-T Standardization Seminar – Madrid, 12-13 December 2002
ITU-T Study Group 15
Responsible for studies relating to:o optical and other transport networks,
systems and equipment including transmission layer related standards for access, metropolitan and long haul sections of communication networks
Lead Study Group on o Access Network Transport (ANT)o Optical Technology
(www.itu.int/ITU-T/studygroups/com15)
Responsible for the development of Recs. in the G-series that support xDSL and optical
accesses.
ITU-TITU-TSG15SG15
ITU-T Standardization Seminar – Madrid, 12-13 December 2002
Many a type of access
F.O.
Copper or F.O.
Copper
Broadcast
SAT
Longhaul
Distribution Network
Access Network
Cable
Home Network
UNI SNI
ITU-TITU-TSG15SG15
ITU-T Standardization Seminar – Madrid, 12-13 December 2002
ITU-T Study Group 15 Structurehttp://www.itu.int/ITU-T/studygroups/com15/index.asp
Study Group 15Optical and other transport networks
Peter Wery
Working Party 3OTN Structure
Stephen Trowbridge
Working Party 4OTN Technology
Gastone Bonaventura
ITU-TSBCounsellorPaolo Rosa
Working Party 2Network Signal Proc.
Yushi Naito
Working Party 1Network Access
Andrew Nunn
Working Party 5Projects and Promotion
Haruo Okamura
ITU-TITU-TSG15SG15
ITU-T Standardization Seminar – Madrid, 12-13 December 2002
Overview of Access Technologies
ITU-TITU-TSG15SG15
ITU-T Standardization Seminar – Madrid, 12-13 December 2002
Typical Access Network Construction
Central Office
(Exchange)
Feeder Network
Street Cabinet
Distribution Network
Overhead Feed
Underground Feed
ITU-TITU-TSG15SG15
ITU-T Standardization Seminar – Madrid, 12-13 December 2002
Access technological evolution
Year9.6 kbit/s28.8 kbit/s
56.6 kbit/s
128 kbit/s
2 Mbit/s
640 kbit/s
8 Mbit/s
25 Mbit/s
50 Mbit/s
1989 1997 2000
Analog modems
ISDN
HDSL/ADSL
VDSL
OPTICALACCESS 622 Mbit/s
G-PON
2003
ITU-TITU-TSG15SG15
ITU-T Standardization Seminar – Madrid, 12-13 December 2002Source Siemens
There will never be enough! The bandwidth demand will continue to grow.Fiber to the home will be necessary sooner or later.
ISDN
100
1k
10k
100k
1M
10M
100M
1G
1980 1990 2000 2010 2020
Year
Bit
rat
e pe
r us
er (
bit/
s)
PSTN / Modem
ADSL
SDSL
FTTH
double in 18 mon .
double in 24 mon .
N.B. The technology bars show
the introduction, not the end of
the technology
VDSL, FTTCab
Capacity, technologies & availability
ITU-TITU-TSG15SG15
ITU-T Standardization Seminar – Madrid, 12-13 December 2002
Optical access network architecture (G.983.1)
ONU
ONU
ONU
O L T
NT
NT
Fibre
Fibre
Fibre
Copper
CopperHOME
Access network
SNI
FTTB/C
FTTCab
FTTH
Optical Distribution Network
ITU-TITU-TSG15SG15
ITU-T Standardization Seminar – Madrid, 12-13 December 2002
Characteristics of different access technologies
Technology
Definition Bandwidth Advantages Disadvantages
ADSLAsymmetric Digital Subscriber Line
Transmission of voice and data over copper
Up to 8 Mbit/s downstream
Up to 1.5 Mbit/s upstream
Makes full use of existing copper Ideal for web-browsing Good platform for voice
Limited video capability Distance limitation Limited upstream bandwidth
VDSLVery High Rate Digital Subscriber Line
Transmission of video, voice and data over copper
Up to 52 Mbit/s downstream Up to 26 Mbit/s symmetrical
Supports broadcast video, Video-on-demand, Internet TV, and interactive TV Offers always-on network for voice, video, and data
Requires short distance Non-standard products and technology Limited scalability
µwave multipoint fixed services
Microwave transmission of video and dataPoint-to-point or point-to-multipoint
Up to 1 Gbit/s downstream and downstream
Fast time-to-market Point-to-multipoint cells have limited geographical area
Needs line of sight to complete transmission
HFCHybrid Fibre/Coax
Transmission of video, voice, and data over coaxial and fibre cable
10 to 42 Mbit/s downstream
2 Mbit/s upstream
Supports broadcast video, Video-on-demand, Internet TV, and interactive TV Offers always-on network for voice, video, and data
Voice requires special engineering Difficult to guarantee speed High cost of upgrades and build-outs
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ITU-T Standardization Seminar – Madrid, 12-13 December 2002
How hungry an application?
2
1
0.5
Up
stre
am M
bit
/s
0.5 1 2 84 Downstream Mbit/s
Business TV
Voice
e-commerce
Video conference
Internet access
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ITU-T Standardization Seminar – Madrid, 12-13 December 2002
Optical Access
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ITU-T Standardization Seminar – Madrid, 12-13 December 2002
Optical Systems for Access NetworksMarket & Business Drivers (1)
o Getting PSTN, data and cable TV together on one system at competitive prices
o Fibre To The Home (FTTH) is the next step for many operators
o The major change is driven by the explosive growth of the Internet usage
o Public and private networks evolve from multiple overlay networks to a unified network platform able to carry multiple applications
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ITU-T Standardization Seminar – Madrid, 12-13 December 2002
Optical Systems for Access NetworksMarket & Business Drivers (2)
o IP routers and ATM switches are providing higher and higher speed optical interfaces
o Major carriers are realizing that services at STM-16 (2.5 Gbit/s) 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
o These new services will require new networking functions (performance monitoring, fault localization, network restoration, etc)
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ITU-T Standardization Seminar – Madrid, 12-13 December 2002
Key aspects for optical technologies
o IP over optical, business and market aspectso Switched optical networkso Optics in access and metropolitan networkso Optical interfaceso Optical/IP network OAM and protection and
restorationo WDM and C&D-WDMo Signalling and routingo Optical fibres, cables and componentso Optical network managemento Optical switching equipmento Network performance (IP/Optical)o Optical network clients and serviceso Services and network evaluation
Making fully-optical networks viable
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ITU-T Standardization Seminar – Madrid, 12-13 December 2002
• 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
• OTN technology (terrestrial and submarine)– Coarse and Dense WDM, 40 Gbit/s signal channels– Optical components & amplifiers (e.g. tunable filters)– Fiber characteristics, more channels/fiber– Transmission technology (Soliton/RZ), long reach
OTN Structure and Technology
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ITU-T Standardization Seminar – Madrid, 12-13 December 2002
TDM Systems@ 1310 nm
TDM systems @ 1550 nm
DWDM Systems
CWDM Systems
Fibre G.652(zero-dispersion @ 1310 nm) [1984]
[1988]
[1996]
[2000]
Fibre G.653(zero-dispersion @ 1550 nm)
Fibre G.655(low dispersion @ 1550 nm)
Fibre G.652.C(zero dispersion @ 1310 nm)
(flat attenuation lossfrom 1260 to 1625 nm)
TDM Systems @ 850 / 1310 nm
Fibre G.651multimode [1980]
Evolution of Standardization – Fibres
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ITU-T Standardization Seminar – Madrid, 12-13 December 2002
Recs. Bit rate Content Date
G.955 140 Mbit/s Single channelPDHLong. Compat.
1984
G.957 STM-16 Single channelSDHtransv. Compat.
1998
G.691 STM-4 up toSTM-256
Single channelTransv compat.Terminal OAs
1994-2000
Evolution of Standardization – Systems (1)
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ITU-T Standardization Seminar – Madrid, 12-13 December 2002
G.692 622 Mbit/s – 10 Gbit/s(STM-4 to STM-16)
WDM 4 to 32 chLong. Compat.Line amplifiersmono/bidirect.
1996 / 1998
G.959.1 2.5 and 10 Gbit/s
Up to 16 channels WDM
Pre-OTNSingle /WDMTransv Compat.Term. OAsId Interfaces
2000
G.693 10 – 40 Gbit/s(STM-64 to STM-256)
Single channelTransv. Compat.Intra office
2001
G.694.1G.694.2
≥ 80 Ch/10 Gbit/sUp to 18 Ch/2.5 Gbit/s
Dense WDM Coarse WDM
2002
Evolution of Standardization – Systems (2)
ITU-TITU-TSG15SG15
ITU-T Standardization Seminar – Madrid, 12-13 December 2002
OTN Standardization Work Plan
Global Optical Transport Network Supporting Today's and Future Services
OTNIrDI
OTNIaDI
Carrier Domain A Carrier Domain B
SDHSTM-N
USER NE USER
NE
OTNIaDI
OTNIaDI
OTNIrDI
OTNNE
OTNNE
OTNNE
User/carrier may originate/terminate the OTN framing for any OTN framing for any digital payloaddigital payload(IP, ATM, SDH,,,)(IP, ATM, SDH,,,)
IaDI = Intra-Domain InterfaceIrDI = Inter-Domain InterfaceNE = Network Element Interfaces:For single/multichannels with performance monitoring
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ITU-T Standardization Seminar – Madrid, 12-13 December 2002
o G.957:• only with electrical regenerators• short distances, small capacities
o G.691:• Uses optical amplifiers only as Booster or Pre-amplifiers• transversal compatibility• bit rates up to STM-64 (10 Gbit/s)• target distances (up to 160 km) based on 11dB/40km at 1550 nm and
11dB/20 km at 1310 nm
WAVELENGHT 1310 1550 1550 1310 1550 1550 1310 1550 1550 1550 1550
Fibre Type G.652 G.652 G.653 G.652 G.652 G.653 G.652 G.652 G.653 G.652 G.653
Target Dist. (Km) 20 40 40 40 80 80 80 120 120 160 160
STM-1 - - - - -
STM-4 G.957 V-4.1 V-4.2 V-4.3 U-4.2 U-4.3
STM-16 V-16.1 V-16.2 V-16.3 U-16.2 U-16.3
STM-64 S-64.1 S-64.2 S-64.3 L-64.1 L-64.2 L-64.3 V-64.1 V-64.2 V-64.3 - -
Single channel systems (G.957 and G.691)
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ITU-T Standardization Seminar – Madrid, 12-13 December 2002
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 needed for specific services needs to be added at the ends of the network as needed to add new services to existing customers or to add new customers.
ITU-TITU-TSG15SG15
ITU-T Standardization Seminar – Madrid, 12-13 December 2002
Optical systems for access networksG.984.x -series Recs (G-PON) – (01-2003)
o Gbit/s capable PON systemso Symmetrical/Asymmetricalo 1.244 and 2.488 Gbit/s downstreamo 155 Mbit/s up to 2.488 Gbit/s upstreamo Business and residential userso Convenient support of IP and Ethernet o Same wavelength plan and full-
network design principles as in G.983.x-series (B-PON)
New!
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Automatic Switched Optical Network (ASON) G.8080
o Architecture components and interactions between control plane, management plane and transport plane for switched wavelength & sub-wavelength connection services.
o Functions:• Facilitate fast & efficient configuration of connections within a
transport layer network• Re-configure connections to maintain calls• Restoring functionCost-effective and survivable architectures
o Adds dynamic capability to new optical networks or already established SDH networks
o Fast turn-up and rapid provisioning; as well as wavelength-on-demand services to increase capacity and flexibility
o Reduced operations cost: more accurate inventory & topology information, resource optimization and automated processes
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ITU-T Standardization Seminar – Madrid, 12-13 December 2002
G.8080 Control Plane and Optical Layer
OCC OCCOCC
OCCASON Control PlaneASON Control Plane
Optical LayerOptical LayerOS
OS OS OSλs, STM-N granularity
OS = Optical SwitchOCC = Optical Connection Controller
Clients, e.g.
IP, ATM, TDM
Clients, e.g.
IP, ATM, TDM
NNI
CCIUNI
IrDI NNI
IrDI
UNI = User Network I/FNNI = ASON control Node-Node I/F
Optical Layer topology, status, control
CCI = Connection Control I/FIrDI = Inter Domain I/F
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ITU-T Standardization Seminar – Madrid, 12-13 December 2002
Coperation:ITU-TIECETSI
Competition:IECIETFIEEE
Fora, Consortia, etc
Relationships:– ATM Forum [traffic and networks management]– DSL Forum [Access network]– TM Forum [network management]– ATIS T1 [Access, SDH, OTN]– IETF [optical transport network]– IEEE [Ethernet, optical interfaces]– TIA [optical networks and technology]– OIF [optical networks and technology]
SDOs cooperating with ITU-T
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ITU-T Standardization Seminar – Madrid, 12-13 December 2002
• Ethernet – PON combination for high bit rate• End-to-end wavelength services• OTN management Information Model (Protocol
neutral and specific)• Terabyte/s in metropolitan and long haul
transport– Optical Internet– Dense & Coarse WDM, PONs
• Multi-Megabit/s and Gigabit/s network access– Internet– TV distribution and interactive
Work in progress
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xDSL Access
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xDSL Market & Business Drivers
o xDSL technology allows the provision of high-speed Internet access and other broadband services over existing copper access lines
o Incumbent operators need to exploit their large installed base of copper access lines for broadband deployment
o Competing operators can exploit incumbent operators access lines via ‘unbundling’ agreements
o Competition:• Digital Cable / Cable Modem• Bi-directional Satellite
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Typical components of an xDSL system
audio/video/data
POTSSplitter
xDT
= SN = Service Node xDSL
xDT xDSL TransceiverDTU-R = Transceiver Unit- RemoteDTU-C = xDSL Transceiver Unit- Central office
U-R
T
CUSTOMER PREMISES CENTRAL OFFICE
POTSSplitter
xDT
U-C
SNI
• PSTN/ISDNSN
• B-ISDN SN• Non-ATM based SN(e.g. - video server - IP router)
(Subscriber line)
xDTU-R xDTU-C
ADSL
ADSL lite
HDSL
SHDSL
VDSL
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ITU-T Standardization Seminar – Madrid, 12-13 December 2002
Typical rates & loop lengths for xDSL
Technology
Up-stream
(kbit/s)
Down-stream
(kbit/s)
Loop length
(km)
HDSL
1 x 2320 2 x 1168 2/3x 784
1 x 2320 2 x 1168 2/3x 784
3
ADSL.dmt
640
(512)
>6144 (3000)
2.7
(4-6)
ADSL.lite
512
1536
5.4
SHDSL
192 2 312
192 2 312
5 2
VDSL
1 600 3 200 6 400
13 000 26 000 52 000
1 500 m
300 m
ITU-TITU-TSG15SG15
ITU-T Standardization Seminar – Madrid, 12-13 December 2002
o G.995.1 – Overview of Digital Subscriber Line (DSL) Recommendations
o G.991.1 (HDSL) – High-bit rate Digital Subscriber Line (HDSL) transmission system on metallic local lines
o G.991.2 (G.SHDSL) – Single-pair High bit rate speed Digital Subscriber Line
o G.993.1 (G.VDSL) – Very high bit-rate Digital Subscriber Line
o G.994.1, G.996.1 and G.997.1 for tests, management and handshake
o ADSL next slide
ITU-T Recommendations on DSL
ITU-TITU-TSG15SG15
ITU-T Standardization Seminar – Madrid, 12-13 December 2002
o G.992.1 (G.DMT) – Asymmetrical Digital Subscriber Line (ADSL) Transceivers
o G.992.2 (G.LITE) – Splitterless Asymmetrical Digital Subscriber Line (ADSL) Transceivers
o G.992.3 – Asymmetric digital subscriber line transceivers - 2 (ADSL2.DMT)
o G.992.4 – Splitterless asymmetric digital subscriber line transceivers - 2 (ADSL2.LITE)
ITU-T Recommendations on ADSL
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ITU-T Standardization Seminar – Madrid, 12-13 December 2002
ADSL versus ADSL2(G.992.1 x G.992.3)
o 2nd generation of ADSL with improvements on: • data rate versus loop reach performance• loop diagnostics• deployment from remote cabinets• spectrum control• power control • robustness against loop impairments and RFI• operations and maintenance
o Improved application support for an all digital mode of operation and voice over ADSL operation;
o Fallback compatibility (?) (if manufacturer opts)
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ITU-T Standardization Seminar – Madrid, 12-13 December 2002
ADSL+ (01/2003)
o G.adslplus G.992.5?
o A delta regarding ADSL2 (G.992.3) DMTo Performanceo Compatibility (but requires ADSL2)o Data rate on long distanceso ADSL+ doubles the bandwidth and
therefore can significantly increase data rates on short loops (extra bandwidth can only be used if the loop attenuation is low enough up to ~ 2.5–3 km).
Soon-to-be!
ITU-TITU-TSG15SG15
ITU-T Standardization Seminar – Madrid, 12-13 December 2002
Other Access Technologies
ITU-TITU-TSG15SG15
ITU-T Standardization Seminar – Madrid, 12-13 December 2002
Home Phone-line Networking Market & Business Drivers
o Redeployment of existing infrastructure facilitates penetration
o Potentially a large market as many homes now have more than one computer and need to share an internet connection and printer etc.
o Network Operators see this as a stimulus for broadband deployment
o Competition: • Powerline networking• WiFi (IEEE 802.11x)
ITU-TITU-TSG15SG15
ITU-T Standardization Seminar – Madrid, 12-13 December 2002
Relevant Recommendations
o Done: G.989.1/G.989.2 – Home Phoneline Networking Transceivers
o In progress: G.pnt.if – Phone-line Networking - Isolation Filter
ITU-TITU-TSG15SG15
ITU-T Standardization Seminar – Madrid, 12-13 December 2002
Things in progress in SG15
o Network access• Home networking (data on in-premises wiring)• Refinements & enhancements xDSL • Web-based ANT standardization plan
o Optical Transport Network (OTN)o x-WDM and 40Gbit/s signal channels
• Optical Cross-Connect and Switch• Fiber characteristics, more channels/fiber• Transmission technology (Soliton/RZ)• Network Node Interface for OTN
o Continue as Lead Study Group on • Access Network Transport• Optical Technology
ITU-TITU-TSG15SG15
ITU-T Standardization Seminar – Madrid, 12-13 December 2002
Thank you for your attention!For further contact, please feel free to contact:
Presenter: Simão Ferraz de Campos [email protected]
Tel: +41-22-730-6805 Fax: +41-22-730-4345
Counsellor for SG 15: Paolo [email protected]
Tel: +41-22-730-5235 Fax: +41-22-730-4345
http://www.itu.int/ITU-T
ITU-TITU-TSG15SG15
ITU-T Standardization Seminar – Madrid, 12-13 December 2002
SupplementalSlides
ITU-TITU-TSG15SG15
ITU-T Standardization Seminar – Madrid, 12-13 December 2002
Q.2/15 - Optical systems for access networks
Recommendations
o G.983.1 + Amendment 1 - High speed optical access systems based on Passive Optical Network (PON) techniques
o G.983.2 - ONT Management and Control Interface specification for ATM PON
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Q.2/15 - Optical systems for access networks
Recommendations (continued)
o G.983.3 - A broadband optical access system with increased service capability by wavelength allocation
o G.983.4 - A broadband optical access system with increased service capability using Dynamic Bandwidth Assignment
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Q.2/15 - Optical systems for access networks
Recommendations (continued)
o G.983.5 - A broadband optical access system with enhanced survivability
o G.983.7 - ONT Management and Control Interface specification for Dynamic Bandwidth Assignment
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G.983.1 + Amendment 1 - High speed optical access systems based on Passive Optical Network (PON)
techniques
o ATM-PONo 155.520/155.520 Mbit/s, 622.080/155.520
Mbit/s or 622.080/622.080 Mbit/s downstream/upstream
o Single or two fibre working o Maximum range of at least 20 Km
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G.983.3 - A broadband optical access system with increased service
capability by wavelength allocation
o Defines new wavelength allocations to distribute ATM-PON signals and additional service signals simultaneously
o Allows distribution of video broadcast services or data services without disturbing basic ATM-PON system
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Q.2/15 - Optical systems for access networks
Current/future work
o Enhancement of G.983.2 to support survivability (G.983.5) and new services
o Enhancement of G.983.3 to include 622.080 Mbit/s upstream rate
o Gigabit PON (2.48832 Gbit/s ?)
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Q.3/15 - Support for Recommendations Specifying Systems Based on ISDN
Physical Layers
Currently working on:
o Possible revision of of I.414 (Overview of Access Recommendations) as necessary to incorporate VB5 interface, and other recent new Recommendations in the area of access
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ITU-T Standardization Seminar – Madrid, 12-13 December 2002
Q.4/15 - Transceivers for customer access and
in-premises phone line networking systems on metallic pairs
Recommendations
o G.991.1 - High bit-rate Digital Subscriber Line (HDSL)
o G.991.2 - Single-pair High-speed DSL (SHDSL)
o G.992.1 - Asymmetrical DSL (ADSL)o G.992.2 - ‘Splitterless’ or ‘lite’ ADSLo G.992.3 - ASDL 2 (2nd generation ADSL)o G.992.4 - Splitterless or ‘lite’ ADSL 2
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Q.4/15 - Transceivers for customer access and
in-premises phone line networking systems on metallic pairs
Recommendations (continued)
o G.993.1 - Very high bit rate DSL (VDSL) – Foundation
o G.994.1 - DSL Handshaking procedureso G.995.1 - Overview of DSL Recommendations
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Q.4/15 - Transceivers for customer access and
in-premises phone line networking systems on metallic pairs
Recommendations (continued)
o G.996.1 - DSL Testing procedureso G.997.1 - DSL Physical Layer management o G.989.1 - Phone-line Networking - Foundationo G.989.2 - Phone-line Networking - Payload
format and Link Layer requirements
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G.991.1 - High bit-rate Digital Subscriber Line transceivers
o Two wire bidirectional transceiver, three systems:
o Two or three pairs, each 748 kbit/so Two pairs, each 1168 kbit/so One pair, 2320 kbit/so Line Code - 2B1Q or CAP (Carrierless
Amplitude and Phase modulation)
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G.991.2 - Single pair High-speed Digital Subscriber Line transceivers
o Duplex (bidirectional) operation on one copper pair
o Payload 192 kbit/s up to 2.312 Mbit/so Optional 2 pairs: Payload 384 kbit/s up to
4.624 Mbit/so Line Code - TC-PAM (Trellis Coded Pulse
Amplitude Modulation)
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G.992.1 - Asymmetric Digital Subscriber Line transceivers
o One twisted pairo Payload upstream up to 640 kbit/so Downstream up to 6.144 Mbit/so Simultaneous Voiceband and N-ISDN
possibleo Line Code - DMT (Discrete MultiTone)
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G.992.2 - Splitterless asymmetric digital subscriber line transceivers
o One twisted pairo Payload downstream up to 1.536 Mbit/so Upstream up to 512 kbit/so Line Code - DMT (Discrete MultiTone)
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ITU-T Standardization Seminar – Madrid, 12-13 December 2002
G.993.1 - Very high bit-rate Digital Subscriber Line transceivers
o One twisted pairo Asymmetric and symmetric data rates up
to tens of Mbit/so Frequency Division Duplexing to separate
upstream & downstream traffico Three band plans defined occupying
138kHz up to 12 MHz
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G.989.1/G.989.2 – Home Phoneline Networking Transceivers
o In-premises distribution of data over existing phoneline wiring
o Nominal effective throughput equal to 10BASE-T Ethernet
o Compatibility with other phoneline services such as POTS, V.90/V.92, ISDN and G.992.2
o Spectrum notching for compatibility with Amateur Radio services
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Q.4/15 - Transceivers for customer access and in-premises phone line
networking systems on metallic pairs
Current/future work
o Revision of Single-pair High-speed DSL (SHDSL) - G.991.2
o Second Generation ADSLo Second Generation‘Splitterless’ ADSL
ITU-TITU-TSG15SG15
ITU-T Standardization Seminar – Madrid, 12-13 December 2002
Q.4/15 - Transceivers for customer access and in-premises phone line networking systems on metallic pairs
Current/future work (continued)
o Very high bit rate DSL (VDSL) – G.vdsl.lo Phone-line Networking - Isolation Filter –
G.pnt.ifo Voice over DSLo Bonding of DSL systemso Power Line Transmission (in-premises
only)?
ITU-TITU-TSG15SG15
ITU-T Standardization Seminar – Madrid, 12-13 December 2002
G.991.2 (SHDSL) transceivers
Multi-rate transmission technology duplex operation over only two-wire twisted metallic
pairs. (G.991.1 is for 1-3 pairs).
Symmetric data rates (scalable): One pair mode: 192 kbit/s to 2312 Kbit/s (single pair
mode), in increments of 8 kbit/s, distance from 1.8 up to 6.5 km.
Two-pair mode: 384 kbps to 4.624 Mbps
Many Manufacturer’s options 4-wire operation Repeaters, etc.
ITU-TITU-TSG15SG15
ITU-T Standardization Seminar – Madrid, 12-13 December 2002
G.993.1 (VDSL) transceivers
Symmetric and asymmetric data rates Downstream as high as 5 to 20 Mbit/s Upstream 1.6, 2.3, 19 Mbit/s or equal
to downstream in case of symmetric tx. American/Japanese/European
Service Types (Annexes) 300 – 1 500 m. reach
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