Tektronix MTG100 - Manual (Page 242)

MTG100 & MTG300 MPEG Generator User Manual
Glossary-1
Glossary
ACTS (Advanced Communications Technologies and Services)
A set of telecommunication research projects financed by the European
Union.
ARIB
Association of Radio Industries and Businesses.
ATSC
Advanced Television Systems Committee.
BAT (Bouquet Association Table)
One of the tables defined by DVB-SI. The BAT provides information
regarding bouquets (collections of services marketed as a single entity).
DVB only.
CAT (Conditional Access Table)
One of the PSI tables described by the MPEG-2 standard. The CAT provides
the association between one or more CA systems, their EMM (Entitlement
Management Message) streams, and any special parameters associated
with them.
CRC (Cyclic Redundancy Check)
One of the fields described in the MPEG-2 standard. CRC is used to verify
the correctness of data in PSI and SI tables.
Defragmentation
The process of rewriting parts of a file to contiguous sectors on a hard disk
to increase the speed of access and retrieval. When files are updated, the
computer tends to save these updates on the largest continuous space on the
hard disk, which is often on a different sector than the other parts of the file.
When files are thus “fragmented,” the computer must search the hard disk
each time the file is accessed to find all of the file’s parts, which slows down
response time.
DVB (Digital Video Broadcast)
A project group of the European Broadcasting Union (EBU).
DVB-MG
Digital Video Broadcasting - Measurement Guidelines.
DVB-SI (Digital Video Broadcast Service Information)
The DVB-SI adds the information that enables DVB IRDs to automatically
tune to particular services and allows services to be grouped into categories
with relevant schedule information. It has several tables, including: NIT,
SDT, BAT, and EIT. (NIT is also required for MPEG-2.)
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