Ericsson SVP 2000, Справочное руководство, Страница: 161 / 196

Glossary
EIT Event Information Table: Equipment: A component of the DVB-
Service Information (SI) stream generated within an Encoder,
containing information about events or programmes such as event
name, start time, duration, etc.
System: EIT (Present/Following) contains the name of the current
and next event. It may include an optional descriptor (synopsis)
giving brief details of content. EIT (Schedule) is used to produce a
full EPG. The EIT is the only DVB-SI table, which can be encrypted.
Elementary Stream A generic term for a coded bitstream, be it video, audio or other.
EMC Electromagnetic Compatibility.
EMM Entitlement Management Message.
Encryption Encoding of a transmission to prevent access without the
appropriate decryption equipment and authorization.
EPG Electronic Programme Guide: On-screen programme listing using
thumbnail pictures and/or text.
Ethernet The most widely used local area network (LAN) defined by the IEEE
as the 802.3 standard. Transmission speeds vary according to the
configuration. Ethernet uses copper or fiber-optic cables.
ETS European Telecommunications Standard.
ETSI European Telecommunications Standards Institute.
FBAS German for CVBS
FCC Federal Communications Commission.
FDM Frequency Division Multiplex: A common communication channel for
a number of signals, each with its own allotted frequency.
FEC Forward Error Correction: A method of catching errors in a
transmission. The data is processed through an algorithm that adds
extra bits and sends these with the transmitted data. The extra bits
are then used at the receiving end to check the accuracy of the
transmission and correct any errors.
FFT Fast Fourier Transformation: A fast algorithm for performing a
discrete Fourier transform.
FIFO First In, First Out: A data structure or hardware buffer from which
items are taken out in the same order they were put in. Also known
as a shelf from the analogy with pushing items onto one end of a
shelf so that they fall off the other. A FIFO is useful for buffering a
stream of data between a sender and receiver that are not
synchronized, i.e. they not sending and receiving at exactly the
same rate.
FM Frequency Modulation: Analogue modulation procedure
Footprint The area of the Earth’s surface covered by a satellite’s downlink
transmission. Also (generally) the area from which the satellite can
receive uplink transmissions.
EN/LZT 790 0046/1 R1A A-7