General Information

 

Term

Definition

 

 

 

 

 

 

 

PMT

Program Map Table. A PSI table within an MPEG transport stream which cross-references

 

 

 

a program (or programs) against all the PIDs that bear its component streams (such as

 

 

 

audios, video, DPI, PCR, etc.). IRDs need this table to decode the compressed

 

 

 

components of that program.

 

 

 

 

 

 

 

Presets Table

A non-volatile table of unit presets. This table is used for either automatic recoveries or as a

 

 

 

shorthand method to quickly reconfigure the unit. The presets table may be programmed at

 

 

 

the factory and edited by the customer, either locally or via network control.

 

 

 

 

 

 

Program

A single media stream (combination of audio, video, data, etc.) tied to a common time base.

 

 

 

 

 

 

 

Program Number

A numerical code representing a program.

 

 

 

 

 

 

 

PSI Tables

A group of information-bearing tables, each borne by well-known PIDs, regularly

 

 

 

transmitted 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

 

 

 

application 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

 

 

 

 

 

 

 

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,

The most recent Unit Setting requested by a user (local or network) command. This value is

 

 

Last Commanded

non-volatile.

 

 

 

 

 

 

 

 

 

 

 

Setting,

The most recent Unit Setting, which is NOT a Temporary Setting, at which the IRD was able

 

 

Last Successful

to deliver services while free of alarms. This may also be the Last Commanded setting 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 Commanded

 

 

 

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. Also,

 

 

 

if the compliant IRD receives a command to change its Permanent Setting while in a

 

 

 

Temporary Setting, the Temporary Setting will not be aborted, but the new Permanent

 

 

 

Setting will be recorded in NVRAM as the Last Commanded setting and the Permanent

 

 

 

Setting pointer will refer to that.

 

 

 

 

 

 

 

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.

 

 

 

 

 

 

 

 

 

 

 

 

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Wegener Communications 4600 manual Pmt, Pts, Ram

4600 specifications

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