Description:
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1 Motivation
Recent fibre optical transmission technology allows extending fibre networks to the curb, the building or the home.
Fibre networks can be brought closer to users' premises than hybrid fibre-coaxial (HFC) networks, although HFC is still widely used in developed countries.
In developing countries, HFC is expected to be used as the primary cable access infrastructure, but use of metallic cable (as the last miles) is considered less expensive to support transmission of digital television.
Fibre technology enables transmission of multichannel digital television signals in the form of RF as in the HFC networks. It can also provide high capacity (10Gbit/s or more) in the forward and return channel in the form of high-speed digital signals such as IP, which is required for the provision of typical cable television services, including interactive ones.
Although several Recommendations on optical access networks have been developed to transmit high quality television signals, further study on the interworking and interfaces between digital video systems and fibre networks is needed.
2 Question
Study items to be considered include, but are not limited to:
- Which mechanisms can be used to transport multichannel digital television signals over fibre networks and hybrid fibre-coaxial (HFC), in view of the high loss of optical splitters used for PON (passive optical networks)?
- Which mechanisms can be used to ensure the low composite distortion and high carrier-to-noise ratio (CNR) that are required for frequency division multiplex (FDM) transport of digital television signals over fibre networks?
- Which mechanism can be used to transport multichannel digital television signals over fibre networks in the form of a high-speed digital communication link or IP packets?
- Which mechanism can be used to compensate the jitter arising from transporting over asynchronous communication links over fibre networks?
- Which mechanism can be used to compensate the packet loss arising from transporting over best effort communication links over fibre networks?
- Which mechanism or interface can be used between content providers, core networks and optical access networks/HFC?
- Which mechanism can be used to control access to the traffic in term of traffic management and security?
- How ITU-T SG21 can support developing countries to deploy digital television services on optical fibres, HFC, and use of metallic cable (as the last miles), taking into account their limited resources as well as other specific needs?
3 Tasks
Tasks include, but are not limited to:
- preparation of new Recommendation(s) regarding the above study items as well as maintenance of existing Recommendations;
- publish useful information (e.g. reports, surveys, supplements, guidelines or handbooks) to support the deployment of digital television services on optical fibres and HFC in developing countries;
- collaborate with ITU-D SG1 and SG2 to fulfil the above tasks and to address bridging standardization gap (BSG) objectives of SG21, including organizing relevant sessions in the framework of the ITU workshops on future of TV in the various regions of the world.
An up-to-date status of work under this Question is contained in the SG21 work programme (https://itu.int/ITU-T/workprog/wp_search.aspx?sp=18&q=14/21).
4 Relationships
Recommendations:
- ITU-T J.83, J.185, J.186 and other relevant J-series Recommendations
- ITU-T G.984-series, G.987-series, G.9807-series and other G-series Recommendations addressing optical fibre networks, systems and interfaces
- Recommendations addressing metallic access networks such as ITU-T G.992-series, G.993-series, G.9701
- ITU-T J.1401 and J-series Supplement 11
Questions:
- All Questions of Study Group 21
Study groups:
- ITU T SG15 (optical network architectures, particularly those related to PON systems, and optical interfaces, and metallic access network)
- ITU-R SG6
- ITU-D SG1 and SG2
Other bodies:
- IEC TC100
WSIS Action Lines:
- C2, C3, C5, C6, C9, C11
Sustainable Development Goals:
- 9
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