(modified former Question 8/9)
In their conversion to digital television, cable television systems in many
countries are also provisioning very high-speed bidirectional data facilities
intended to support, among other payloads, those utilizing Internet Protocols
(IP). These facilities can also be used to supply other digital services to the
home, based on packet-data, exploiting the broadband capacity provided by hybrid
fibre/coaxial (HFC) digital cable television systems, and interconnecting local,
geographically distinct digital cable television systems through direct
connections or managed backbones.
The envisaged range of packet-based data services to be provided encompasses
those services and applications that are based on the use of IP. It also
encompasses among others, digital bidirectional (interactive) television and
sound-programme cablecasting, advanced interactive television, sound-programme
and multimedia services, video conference and video telephony down to the
emulation of some services that are now normally provided over the public
switched telephone network (PSTN).
The technology considered for the delivery of those packet-based data
services over the cable television infrastructure resorts to the use of the
relevant transmission protocols, including Internet Protocols (IP) and
The peculiarities common to the range of services to be provided are:
- the use of modern hybrid bidirectional fibre/coax television cable
- the use of the transmission methods specified for those networks;
- the use of the architecture and modems specified for those networks;
- compliance with the specifications and QoS peculiar to those networks;
- capability for real time (low latency) operation for interactive services that
- interoperability with relevant transmission protocols for packet-based data,
notably IP protocols;
- a performance level that is equal to or better than the one provided by the PSTN, for telephone-type services.
- What are the services that could desirably be provided over the digital
cable television infrastructure, by means of packet-based data transmission?
- What are the functionalities that each service should be capable to provide in
order to meet its service requirements?
- Which open protocols can be used for the envisaged services, preferably
choosing them among those already recommended for packet-based data by other
bodies, or identifying the need for appropriate enhancements to them, paying
attention to their desirable interoperability with Internet protocols?
- Which specification should be recommended for the mechanisms to be provided
for each considered service, in order to allow its future extension to further
- In particular, for those services and applications that utilize Internet
Protocols, the following specific Questions should be studied:
- Which user requirements apply to the provision of digital services that
support applications utilizing Internet Protocols (IP) and operate over
bidirectional cable television systems?
- Which digital interfaces are needed to support applications utilizing Internet
Protocols over cable television systems?
- Which systems implications for cable television systems derive from the
requirement that they should be able to support digital services and
applications that utilize Internet Protocols?
- What enhancements to existing Recommendations are required to provide energy
savings directly or indirectly in Information and Communication Technologies (ICTs)
or in other industries? What enhancements to developing or new Recommendations
are required to provide such energy savings?
Tasks include, but are not limited to the preparation of new Recommendations,
that will eventually fully specify the open protocols recommended for use in the
secondary distribution of the desired IP-based and/or packet-based data services
and applications via the digital cable television infrastructure.
An up-to-date status of work under this Question is contained in the
SG 9 Work Programme.
- Cooperation in the study of this Question should be established with at
least Study Groups 13, 15 and 16; the studies should preferably be performed in
a Joint Rapporteur Group that would report to Study Group 9 and would enjoy the
active participation of experts from the other study groups.