Harmonic ProView 7000, User Manual

Page: 206 / 218

Glossary
Numerics
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© 2012 Harmonic Inc. 206 ProView 7000 v.2.6, Rev. E
downstream
The direction of the communications service data flow. Broadcast services flow downstream from the
service provider to the subscriber.
DPI
Digital Program Insertion. Also referred to as Splicing, is the process in which the main feed is spliced to
allow the insertion of another stream, usually an ad.
DSR
Deterministic SFN Re-multiplexing
DTS
Decoding Time Stamp. An MPEG-2 defined field that can be present in the
PES
packet header to
indicate the time the access unit is decoded in the system target
decoder
.
DTV
Digital Television.
dual channel
A channel that consists of two audio signals that are not related to each other, for example, the English
and Japanese translation of a program’s audio.
DVB
Digital Video Broadcasting project of the EBU. Specifies transmission and related standards for Europe
(primarily) as well as other parts of the world.
DVB-ASI
DVB Asynchronous Serial Interface. A 270 Mbps serial interface to carry MPEG-2 Transport Stream.
DVB-CI
Digital Video Broadcasting – Common Interface
DVB-S
Digital Video Broadcasting - Satellite.
DVB-S2
Digital Video Broadcasting - Satellite - second generation.
E
ECM
Entitlement Control Message. An ECM is a message generated by the conditional access system (
CAS
).
The ECM contains an encrypted version of the control word that only authorized subscribers can
decrypt.
See also
EMM
.