Triple-Play Service Deployment

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Glossary
ETR 290 ETSI recommendation regarding measurement of MPEG-2/DVB transport streams.
Full number is ETSI TR 101 290 vx.x.x
ETSI European Telecommunication Standard Institute
ETT Extended Text Table
Event A collection of elementary streams with a common time base and an associated
start time and end time. An event is equivalent to the common industry usage of
“television program.”
Event Dead Zone Minimum distance on the trace, where two separate events can still be
distinguished.The distance to each event can be measured, but the separate loss of
each event cannot be measured. This parameter gives an indication of the
minimum distance in order to distinguish between reflective events which occur in
close proximity.
– For a reflective event, the event dead zone definition is the distance between
the two opposite points which are 1.5 dB (or FWHM) down from the peak.The
reflectance of the event shall be specified as an example Telcordia gives a
reflectance of -30 dB.
– For a non-reflective event, the event dead zone definition is the distance
between the points where the beginning and ending levels at a splice or a given
value (__1 dB) are within ±0.1 dB of their initial and final values. Usually this
dead zone is a fixed value and depends only on the pulse width and the fiber.
This definition is not often used.
Event Information Table The ATSC PSIP is a table that carries event information including titles and start
(EIT) times for events on all the virtual channels within the transport stream. ATSC
requires that each system contain at least 4 EIT tables, each representing a different
3-hour time block.
Extended Text Table (ETT) The optional ATSC PSIP table that carries long descriptions of events and channels.
There are two types of ETTs: Channel ETTs, which carry channel descriptions, and
Event ETTs, which carry event descriptions.
FDM Frequency Division Multiplexing
FEC Forward Error Correction. A method for protecting the transport stream against
error. FEC adds error control bits before RF modulation.With these bits, errors in the
transport stream up to certain limits may be detected and corrected prior to
decoding.
Ferrule A mechanical fixture, generally a rigid tube, used to confine and align the polished
or cleaved end of the fiber in a connector. Generally associated with fiber-optic
connectors.
Fiber Distributed Data A standard for 100 Mbit/s fiber optic local area network.
Interface (FDDI)
Fiber Optic Span A series of one or more terminated optical fiber elements which may contain
complex passive components.
Floor Distributor The distributor used to make connections between the horizontal cabling, other
cabling subsystems, and active equipment.