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ITU-T Study Group 15 List of Questions Under Study (Study Period 2005-2008) |
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ITU-T SG 15 Question 2/15 |
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Optical systems for fibre access networks (Continuation of Question 2/15)
- Motivation
Recommendations in the Broadband Passive Optical Network (B-PON/G.983.x)
and Gigabit PON (G-PON/G.984.x) series have allowed telecommunications
manufacturers to develop PON based, inter-operable access equipment.
Practical experience with the design and deployment will necessitate
revision of these Recommendations to include, for example, enhanced
services, better interoperability (for example via Implementors' Guides),
use of enhancement band, higher split ratios and increased capacity.
To increase service capability the use of new technologies such
as wavelength division multiplexers and optical amplifiers, or
new system approaches such as Hybrid Fibre-Radio (HFR) systems
in the access network, will necessitate the development of
new Recommendations.
Fibre access systems need to support a range of service capabilities
at the edge. Wireless, wireline and fibre (e.g. G.65x and Plastic
Optical Fibre (POF)) will be needed. Economies are needed for fibre
access deployment to become prevalent as a mass-market solution.
Demand will be driven by factors such as: the ability to carry
interactive and broadcast services (e.g. residential video, HDTV),
managed bandwidth to multiple Internet Service Providers (ISPs),
together with higher quality of service and improved resilience.
Solutions are required for a wide range of market segments and
situations including: business, small-to-medium-enterprise,
small-office-home-office, residential, green field, and
network upgrade.
Demand for dedicated GbE and 10GbE services initially to business
users is increasing. New techniques are needed to increase
performance and reduce costs for both dedicated and shared
bearer services. Both access and metro networks should be
considered when offering such access services, because currently,
access nodes are sometimes bypassed to minimize overall network cost.
Both Point-to-point and point-to-multi-point solutions
will be considered.
Integration of all services onto a single backhaul fibre
network is an important economic consideration for
network operators.
The following major Recommendations, in force at the time
of approval of this Question, fall under its responsibility:
G.981, G.982, G.983, G.984 and G.985 series.
- Question
- What new or modifications to existing Recommendations are needed to
- integrate access and metro/backhaul networks into one seamless
optical access system?
- allow increased use of Wavelength Division Multiplexing (WDM) in
optical access systems and architectures?
- allow optical access systems to operate at higher bit-rates?
- serve a mixture of optical, copper and radio (broadband) final
customer connections to the same optical access system, with
minimum street electronics?
- feed mobile broadband radio base-stations from optical systems such
that customers can roam efficiently within the geographical
reach of one optical system, or between different optical systems?
- enable a cost reduced Optical Network Unit (ONU) for narrowband Fibre
To The Home (FTTH) residential customers and allow them to be easily
upgraded to broadband?
- improve security of PONs?
- What new Recommendations need to be developed to
- allow systems to evolve to higher split ratios physically and logically?
- meet requirements for longer reach in the access network?
- allow full services over Ethernet (e.g., TDM over Ethernet, encapsulation
techniques, Quality of Service (QoS), management of Ethernet services)?
- What enhancements or new Recommendations are needed to:
- enable new resilience requirements to be achieved in the
fibre access network; e.g. dual cards, Virtual Path (VP) protection,
switchover procedures, alternative paths or drop transmission media?
- add new Optical Network Termination (ONT) Management Control
Interface [OMCI] requirements; e.g. management systems support of new
services, (e.g. configuration, fault performance) or additional
attributes to existing managed entities.
- What enhancements to existing Recommendations
- need to be defined to improve interoperability?
- are needed to enable legacy or other services on a fibre
access network; e.g. telephony, data, video?
- What new or modifications to existing Recommendations are needed to
enable fibre access systems to be provided which support
- multiple drop media
- carrier grade services
Study items to be considered include, but are not limited to:
- New long-reach access system(s) for access/metro-integrated
applications based on WDM access and/or enhanced TDM access technologies.
- How to specify ONT’s for the consumer market?
- Impact of new component technology on optical access network.
- How to ensure the optical systems contribute to the end-end QoS for packet services?
- How to ensure the maximum service capability for Ethernet and
Wireless Local Area Network (WLAN) edge networks?
- How to provide for video services?
- Interoperability and physical interconnect conformance.
- The definition of access demarcation point in the light of media converters.
- Modulation schemes over fibre access (e.g. radio over fibre,
Digital Subscriber Line (xDSL) over fibre).
- What is the service capacity and requirements (e.g. QoS) outlook for access?
- Tasks
Tasks include, but are not limited to:
- Maintenance and enhancements of G.983, G.984 and G.985 series
Recommendations with regard to capacity, interoperability, management
and control interfaces, survivability, spectral management,
split ratios or other requirements
- Draft a new Recommendation on general characteristics of the
new long-reach access system(s) for access/metro-integrated applications.
Note: An up-to-date status of work under this Question is contained in the
SG 15 Work Programme.
- Relationships
- Recommendations:
- Questions:
- Q4/15, Q6/15, Q12/15 and Q.14/15
- Study Groups:
- ITU-T SG 4 on management aspects
- ITU-T SG 6 on hybrid fibre/copper cables for outside plant
- ITU-T SG 9 on television and sound transmission
- ITU-T SG 13 on Multi-Protocol Label Switching (MPLS) layer characteristics
- ITU-R SG 9 on radio-frequency transport over optical fibres on fixed wireless loop
- Standardization bodies, forums and consortia:
- IEC TC86 and its sub-committees on system test methods
- DSL Forum on xDSL management
- IETF on ADSL MIB
- IEEE on Ethernet and WLAN
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