UNITY 4600 USERS MANUAL

 

Table 1.3: Glossary of Terms

 

 

Term

Definition

 

 

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

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

Commanded

volatile.

 

 

Setting, Last

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

Successful

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.

 

 

TMRA

Maximum Recommended Ambient Temperature, the highest operating temperature for which the

 

unit is rated

 

 

Transport Stream

A multiplex of several data streams, each of which is borne in transport packets, 188-byte blocks

(or MPEG Transport

containing a sync word, header information (including a PID), and payload data. This multiplex

Stream)

includes PSI data tables, programs, padding, and floating PIDs such as those used by COMPEL®

 

network control.

 

 

Warning

A condition or notification of (1) a condition that may compromise the proper performance of your

 

U4600; or (2) any non-alarm condition that should be brought to local user’s attention.

 

 

800032-01 Rev. F

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Wegener Communications 4600 Service Descriptor, Service Settings, Setting, Last, Commanded, Successful, Setting, Permanent

4600 specifications

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