Definition of Terms - Digital Video and Audio Broadcasting Technology - page 558

Elementary Stream (ES)
The elementary stream is a 'continuous' data stream for video, audio or
user-specific data. The data originating from video and audio digitization
are compressed by means of methods defined in MPEG-2 Video and
MPEG-2 Audio.
Entitlement Control Messages (ECM)
ECM comprise information for the descrambler in the receiver of a CA
system providing further details about the descrambling method.
Entitlement Management Messages (EMM)
EMM comprise information for the descrambler in the receiver of a CA
system providing further details about the access rights of the customer to
specific scrambled programs or broadcasts.
Event Information Table (EIT)
EIT is defined both as an SI table (DVB) and a PSIP table (ATSC). It
provides information about program contents like a TV guide.
In DVB the EIT is transmitted in TS packets with PID 0x0012 and indi-
cated by a table_ID from 0x4E to 0x6F. Depending on the table_ID, it con-
tains different information:
Table_ID 0x4E actual TS / present+following
Table_ID 0x4E actual TS / present+following
Table_ID 0x4F other TS / present+following
Table_ID 0x50...0x5F actual TS / schedule
Table_ID 0x60...0x6F other TS / schedule
EIT-0 to EIT-127 are defined in ATSC. Each of the EIT-k comprises in-
formation on program contents of a three-hour section where EIT-0 is the
current time window. EIT-4 to EIT-127 are optional. Each EIT can be
transmitted in a PID defined by the MGT with table_id 0xCB.
Extended Text Table (ETT)
ETT is a PSIP table (ATSC) and comprises information on a program
(channel ETT) or on individual transmissions (ETT-0 to ETT-127) in the
form of text. ETT-0 to ETT-127 are assigned to ATSC tables EIT-0 to
EIT-127 and provide information on the program contents of a three-hour
section. ETT-0 is with reference to the current time window, the other
ETTs refer to later time sections. All ETTs are optional. Each ETT can be
transmitted in a PID defined by MGT with table_id 0xCC.
Forward Error Correction (FEC)
Error protection in data transmission, channel coding.
Integrated Receiver Decoder (IRD)
The IRD is a receiver with integrated MPEG-2 decoder. A more collo-
quial expression would be set-top box.