Triple-Play Service Deployment

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Glossary
Digital Television A general term used to describe television that has been digitized. It can refer to
Standard Definition Television or High Definition Television.
Digital Video Broadcasting A European consortium that has standardized digital TV broadcasting in Europe and
(DVB) Project in other countries.
Dispersion The cause of bandwidth limitation in a fiber. The spreading (or broadening) of a
light pulse as it spreads along a fiber. Major types are :
– modal dispersion caused by differential optical path lengths in a multimode
fiber
– chromatic dispersion caused by a differential delay of various wavelengths of
light passing through a fiber
Distributed Feedback Laser with a Bragg reflection grating in the active region in order to suppress
(DFB) Laser multiple longitudinal modes and enhance a single-longitudinal mode.
Distributor The term used for the functions of a collection of components (e.g., patch panels,
patch cords) used to connect cables.
DMT Discrete Multi-Tone. A line coding used for DSL technologies.
Downlink Communication link from a satellite to a terrestrial receiver.
Downstream Rate The line rate, typically in bits per second, of data transfers in the direction from the
network machine to the user's machine.
DS Downstream; also called Dn.
DSL Digital Subscriber Line. A generic name for a family of standards allowing highspeed
data transfer over copper telephone lines.
DSLAM Digital Subscriber Line Access Multiplexer. The line cards in the DSLAM terminate
the network end of a DSL line.
DTE Data Terminal Equipment
DTMF Dual Tone Multi- Frequency. A voice-band tone based method of signaling, typically
used for the PSTN voice network.
DTS Decoding Time Stamp
DTV Digital Television. A general term used to describe television that has been
digitized. It can refer to standard-definition TV or high-definition TV
DVB Digital Video Broadcasting.
DVB Asynchronous Serial A standard coaxial DVB interface for MPEG-2 transport streams.
Interface (ASI)
DVB Synchronous Parallel A standard DVB interface for a video transport stream.
Interface (SPI)
DVB-C Digital Video Broadcasting-Cable. The DVB standard for broadcasting digital TV
signals by cable. The RF spectrum in digital cable TV networks has a frequency
range of (approx) 46MHz to 850MHz.