Triple-Play Service Deployment

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Glossary
PSI Program Specific Information. PSI refers to MPEG-2 table data necessary for the demultiplexing
of a transport stream and the regeneration of programs within the
stream. PSI tables include PAT, CAT, PMT, and NIT.
PTS Presentation Time Stamp.This stamp indicates the time at which an element in the
transport stream must be presented to the viewer. PTSs for audio and video are
transmitted at least every 0.7 seconds.The PTS is found in the PES header.
QAM Quadrature Amplitude Modulation. This is a type of modulation for digital signals
used in CATV transmission (DVB-C).Amplitude and phase of a carrier are modulated
in order to carry information
QPSK Quadrature Phase Shift Keying. A type of modulation for digital signals used in
satellite transmission (DVB-S).
RBN Regional Broadband Network
Reed-Solomon Bit errors that were not corrected by the Reed-Solomon coding.
Uncorrected Errors
Reflectance The ratio of reflected power to incident power of an event or connector R = 10
log(Pr/Pi).
Refractive index A property of light transmitting materials defined as the ratio of the velocity of light
in vacuum (c) to its velocity in a given transmission medium (v). n = c/v
Remote Address The IP address of a remote server.
Remote Gain Receiver gain in the upstream direction in dB. Note that this can be negative but
usually is not.
Remote Transmit Power Transmit power in dBm in the downstream direction. Note that this can be (and
often is) negative
Repeater A device used to regenerate an optical signal to allow an increase in the system length.
RFC Request for Comments
RFI Radio Frequency Interference
Route The path that network traffic takes from its source to its destination. The route a
datagram may follow can include many gateways and many physical networks.
RS Reed-Solomon Protection Code.This refers to the 16 bytes of error control code that
can be added to every transport packet during modulation.
RST Running Status Table. A DVB-SI table that indicates a change of scheduling
information for one or more events. It saves broadcasters from having to retransmit
the corresponding EIT.This table is particularly useful if events are running late. It is
located on PID 0x0013.
Scattering A property that causes light to deflect out of the core area of the fiber, thereby
contributing to attenuation.