DVB Data Services: MHP and SSU - Digital Video and Audio Broadcasting Technology - page 497

27 DVB Data Services: MHP and SSU

Apart from DVB-H, there are also other DVB data services. These are the
Multimedia Home Platform, or MHP in short, and the System Software
Update (SSU) for DVB receivers. In parallel with these, there is also
MHEG (the Multimedia and Hypermedia Information Coding Experts
Group) running over DVB-T in the UK. All these data services have in
common that they are broadcast via so-called object carousels in DSM-CC
sections. Applications are transmitted to the receiver via MHP and MHEG
and can be stored and run by a receiver especially equipped for this pur-
pose. In the case of MHP, these are HTML files and Java applications
transmitted to the terminal in complete directory structures. MHEG allows
HTML and XML files to be transmitted and started.

Video/audio/
data

PSI/SI
tables

Data

Data

Object
carousel's,
IP over
MPEG
(MPE)

asynchronous
or synchronous
data streaming

DSMCC
Sections

direct copy of
data into
payload of
an MPEG2
transportstream
packet
=
data piping

table_ID

PTS

H PES packets Sections

~64 max.
kByte

max.
4kByte

MPEG2 transport stream

Fig. 27.1. Data transmission via an MPEG-2 transport stream: data piping, data
streaming and DSM-CC sections