User`s manual

Unity 4650 User’s Manual
wegener.com 23 800034-01 Rev. A
Program Number A numerical code representing a program.
PSI Tables A group of information-bearing tables, each borne by well-known PIDs, regularly trans-
mitted in the transport stream. See also “PAT” and “PMT”. Also, ISO 13818-1 gives a
thorough description of these and other Tables.
PTS Presentation Time Stamp. A marker signal associated with audio and video streams
within a program conveyed in MPEG transport stream. This signal allows the audio and
video to be presented in synchronism to each other.
RAM Random access memory. A general term for all volatile memory types out of which appli-
cation software executes and into which its variables, state information, and messages are
stored. RAM is also used to designate the volatile storage used by the Transport Demux
and decompression devices.
RF Radio frequency
SDI Serial Digital Video. An interface for transmission of uncompressed video in digital form
on coaxial cabling. (Within this signal, two stereo pairs of AES3 digital audio may also
be conveyed - also called "embedded audio".)
Service Descriptor Service Descriptors are text entries in the Service Descriptor table (SDT, defined per a
DVB standard). Service Descriptors are used to give text names to the Programs within
transport streams.
Service settings That part of the Unit Settings which allow for the local detection, decompression, and
output (or "display") of a program's services.
Setting,
Last Commanded
The most recent Unit Setting requested by a user (local or network) command. This value
is non-volatile.
Setting,
Last Successful
The most recent Unit Setting, which is NOT a Temporary Setting, at which the IRD was
able to deliver services while free of alarms. This may also be the Last Commanded set-
ting or it may be the attempted (Transient) setting at which auto-recovery was successful.
This value is non-volatile.
Setting, Permanent That non-volatile Unit Setting which the IRD will attempt, if in Normal Operation, after a
unit reset. This will be the Last Commanded setting unless, since that command was
issued, the IRD had executed an Auto-Recovery and successfully acquired at one of the
Preset settings. In other words, the Permanent Setting is the most recent of the Last Com-
manded and Last Successful Settings.
Setting, Temporary A special volatile unit setting with a timed expiration period. The command to invoke this
special setting and the subsequent success of the IRD to find services at this setting does
not affect the non-volatile value of the Last Commanded or Last Successful Settings.
Setting, Transient A volatile Unit Setting used for immediate acquisition of services. Transient settings are
either Temporary settings (see above) or Presets used for attempted acquisition during
Auto-Recovery. If, in the case of Presets, the attempt is successful, those settings become
Permanent Settings.
T
MRA
Maximum Recommended Ambient Temperature, the highest operating temperature for
which the unit is rated
Table 3: Glossary of Terms
Term Definition