Virtual channel dependent on the necessary information
transfer rate
}
_
.T&
lw(72p) | lw(66p) | lw(72p) | lw(66p) | lw(66p) .
8.2 Signalling/selecting {
D channel or a special channel for distribution service signalling
} {
D channel or special channel (under study)
} {
D channel or special channel (under study)
}
_
.TE
.nr PS 9
.RT
.ad r
\fBTableau B\(hy4/I.121, [1T5.121], p. 19\fR
.sp 1P
.RT
.ad b
.RT
.LP
.bp
.ce
\fBH.T. [2T5.121]\fR
.ce
.ps 9
.vs 11
.nr VS 11
.nr PS 9
.TS
center box;
cw(342p) .
{
TABLE\ B\(hy4/I.121 \fI(continued)\fR
}
.T&
cw(72p) | cw(138p) | cw(132p) , ^ | c | c.
Attributes {
Existing quality TV distribution
service | ua\d\u)\d | ub\d\u)\d
} HDTV distribution service
Values Values
_
.TE
.TS
center box;
lw(72p) | lw(66p) | lw(72p) | lw(66p) | lw(66p) .
9. Access protocols
Signalling access protocols
9.1 Layer 1 To be defined To be defined To be defined To be defined
I.440/441
I.450/451
Need supplements for broadband
communication
} {
I.440/441
I.450/451
Need supplements for broadband
communication
} {
I.440/441
I.450/451
Need supplements for broadband
communication
}
.T&
lw(72p) | lw(66p) | lw(72p) | lw(66p) | lw(66p) .
Information access protocols To be defined To be defined To be defined To be defined
.T&
lw(72p) | lw(66p) | lw(72p) | lw(66p) | lw(66p) .
{
9.4
Layer 1
9.5
Layer 2
9.6
Layer 3
} Under study Under study Under study Under study
_
.T&
lw(72p) | lw(66p) | lw(72p) | lw(132p) .
{
\fIHigh layer attributes\fR
}
.T&
lw(72p) | lw(66p) | lw(72p) | lw(132p) .
10. Type of user information Moving picture + sound + data Moving picture + sound + data {
Moving picture + sound + data
}
_
.T&
lw(72p) | lw(66p) | lw(72p) | lw(132p) .
{
11.
Transfer (layer 4) function/protocol
} For further study For further study For further study
_
.T&
lw(72p) | lw(66p) | lw(72p) | lw(132p) .
{
12.
Session (layer 5) function/protocol
} For further study For further study For further study
_
.T&
lw(72p) | lw(66p) | lw(72p) | lw(132p) .
{
13.
Presentation (layer 6) function/protocol
}
.T&
lw(72p) | lw(66p) | lw(72p) | cw(132p) .
{
13.1
Video
13.2
Audio
13.3
Auxiliary
13.4
User\(hyto\(hyuser messages
} {
For further study, awaiting suitable coding
schemes
} {
For further study, awaiting suitable coding
schemes
} {
For further study, awaiting suitable coding
schemes
}
_
.T&
lw(72p) | lw(66p) | lw(72p) | cw(132p) .
{
14.
Application (layer 7) function/protocol
}
.T&
lw(72p) | lw(66p) | lw(72p) | cw(132p) .
{
14.1
Video
14.2
Audio
14.3
Auxiliary
14.4
User\(hyto\(hyuser messages
} For further study For further study For further study
_
.T&
lw(72p) | lw(66p) | lw(72p) | cw(132p) .
\fIGeneral attributes\fR
.T&
lw(72p) | lw(66p) | lw(72p) | cw(132p) .
{
15.
Supplementary services provided
} For further study For further study For further study
_
.TE
.nr PS 9
.RT
.ad r
\fBTableau B\(hy4/I.121, [2T5.121], p. 20\fR
.sp 1P
.RT
.ad b
.RT
.LP
.bp
.ce
\fBH.T. [3T5.121]\fR
.ce
.ps 9
.vs 11
.nr VS 11
.nr PS 9
.TS
center box;
cw(342p) .
{
TABLE\ B\(hy4/I.121 \fI(continued)\fR
}
.T&
cw(72p) | cw(138p) | cw(132p) , ^ | c | c.
Attributes {
Existing quality TV distribution
service | ua\d\u)\d | ub\d\u)\d
} HDTV distribution service
Values Values
_
.TE
.TS
center box;
lw(72p) | lw(66p) | lw(72p) | lw(132p) .
16. Quality of service
.T&
lw(72p) | lw(66p) | lw(72p) | cw(132p) .
16.1 Video Equal to existing TV {
Equal to existing TV (or better)
} HDTV quality
_
.T&
lw(72p) | lw(66p) | lw(72p) | lw(132p) .
16.2 Audio {
Equal to existing high fidelity stereo standards
(or better)
} {
Equal to existing high fidelity stereo standards
(or better)
} {
Equal to existing high fidelity stereo standards
(or better)
}
_
.T&
lw(72p) | lw(66p) | lw(72p) | lw(66p) | lw(66p) .
{
\(em
End\(hyto\(hyend transfer delay
\(em
Delay jitter (cell
jitter)
\(em
Error characteristics
\(em
Information loss probability
} Under study Under study Under study Under study
_
.T&
lw(72p) | lw(66p) | lw(72p) | lw(66p) | lw(66p) .
{
17.
Interworking possibilities
} For further study For further study For further study For further study
_
.T&
lw(72p) | lw(66p) | lw(72p) | lw(66p) | lw(66p) .
{
18.
Operational and commercial
} For further study For further study For further study {
For further study
}
.TE
.LP
\ua\d\u)\d
The attribute values characterize a TV distribution service
providing high video quality equal to, or higher than, existing TV standards. Until now only coding mechanisms for those video qualities have been available which require transfer bit rates equal to, or higher than, the
H
2
1\(hychannel bit rate. Due to future development in research of coding
algorithms and techniques, the transfer bit rates necessary for those video
qualities may decrease.
.LP
\ub\d\u)\d
Preliminary name.
.LP
\uc\d\u)\d
The values for the information transfer mode attribute need
further study. For example, the distinction between the STM (circuit) and the ATM (deterministic) values needs to be investigated.
.LP
\ud\d\u)\d
In the ATM deterministic mode a transfer capacity of the peak bit rate will be provided to the user all the time (average bit rate\ =\ peak bit
rate). In the ATM statistical mode a transfer capacity of only the average
gross bit rate (i.e. the average net bit rate plus cell headers) will be
provided to the user (depending on the throughput class).