Ericsson SPR1100 Operations Instructions Page 180

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Stream Processing and Networking
6.2.2 Services
The system is capable of forming up to 72 services divided between the output
transport streams. Each service can contain a maximum of 18 elementary streams,
consisting of a maximum of 8 data components, 8 audio components, one main
video and one PIP video component.
An elementary stream can be included in up to four services. Only one main video
elementary stream can be assigned to a service, and the audio delay will be
matched to the video. A PIP Video stream may also be added. Only one PCR
(Program Cl
ock Reference: A time stamp in the transport stream from which the
decoder timing is derived) can be associated with a service.
6.2.2.1 Service Information Tables
The Service Information (SI) tables t
hat the system generates for each individual
output Transport Stream can be selected. The following table shows the available
levels.
Table 6.3 Service Information Levels
SI Level Description
Off Elementary streams only
On (PAT/PMT Only) PAT/PMT are generated
On (PAT/PMT/SDT/CAT)
The listed tables are generated. The CAT will be empty as
Conditional Access is not supported in this release.
Some users may not require ETR 290 compliance, so it is possible to set the PMT
(Program Map Table) repetition rate to either 100 ms (default) or 500 ms.
Note: The Program Map Table is part of the MPEG-2 Program Specific
Information (PSI) data and is mandatory for MPEG-2 compliance. Each
service has a PMT which lists the component parts (elementary streams of
audio, video etc.) for the various services being transmitted.
6.2.2.2 Formation of SI
SI packet fo
rmation and play out is the responsibility of the host card. However it is
the Media Processing Module's responsibility to provide SI data fields related to the
stream that it is generating.
6.2.2.3 Repetition Rate
The repetitio
n rate of SI packets must take into account the output Transport Stream
rate, otherwise the jitter introduced by the multiplexing of packets to form the
Transport Stream can lead to the SI repetition rate being too long.
2/1553-FGC 101 1400 Uen B
6-10
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