Triple-Play Service Deployment

Glossary
DVB-S Digital Video Broadcasting-Satellite. The DVB standard for broadcasting digital TV
signals via satellite.
DVB-T Digital Video Broadcasting-Terrestrial. The DVB standard for broadcasting digital
terrestrial TV signals.
DWDM Dense Wave Division Multiplexing
Dynamic Range IEC Dynamic Range (introduced by Bellcore, now Telcordia) The difference between
the extrapolated point of the backscatter trace at the near end of the fiber (taken at
the interception between the extrapolated trace and the power axis) and the upper
level of the noise floor at or after the fiber end. The upper level of the noise is
defined as the upper limit of a range which contains at least 98% of all noise data
points. The dynamic range is expressed in decibels (dB). This measurement is
performed for 180 seconds usually with largest pulse width of the OTDR.
RMS Dynamic Range The difference between the extrapolated point of the backscatter trace at the near
end of the fiber (taken at the intersection between the extrapolated trace and the
power axis) and the RMS noise level.
Echo The reflecting of a portion of a transmitted signal back toward its source due to a
variety of reasons specific to the technology involved.
ECM Entitlement Control Message. A message in the transport stream that carries the
keys used by the decoder to descramble the audio, video, and data for a program.
EDFA Erbium Doped Fiber Amplifier. Device which amplifies an optical signal without
employing O/E and E/O conversions.
EIT (ATSC) Event Information Table.An ATSC PSIP table that carries program guide information
including titles and start times
Electromagnetic Spectrum Term used to describe the entire range of light radiation, from gamma rays to radio.
Elementary Stream (ES) A bit stream that includes video, audio, or data. It represents the preliminary stage
of the Packetized Elementary Stream (PES).
Encapsulation The technique used by layered protocols in which a layer adds header information
to the protocol data unit (PDU) from the layer above.
EMM Entitlement Management Message. A message in the transport stream used to
update the subscription options or pay-per-view rights for an individual subscriber
or for a group of subscribers.
EOC Embedded Operations Channel (between a VTU-O and VTU-R or ATU-C and ATU-R).
Used to carry communications between the two devices regarding their operation.
EPG Electronic Program Guide. Display that describes all programs and events available
to the viewer. It functions as an interactive TV guide that allows users to view a
schedule of available programming and select an event for viewing.
Ethernet A local area network (LAN) communications scheme defined by IEEE 802.3.
Ethernet has also become a generic term for data flows using Ethernet framing for
the data units for WAN circuits.
ETR ETSI Technical Report
277