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SECTION 2—FEATURES AND SERVICES
This section describes the System Features,
Network Features, Data Features, Station
Features, and Attendant Features of AT&T System 25. It also covers certain services that
support and implement the features; included in this category are the digital tape unit, the
dial plan, system administration, and system maintenance. A general discussion of data
topics is also provided.
The feature descriptions are arranged in alphabetical order, regardless of the feature group
to which they belong.
Information for each feature is presented under five headings:
Description, Considerations, Interactions, Administration, and Hardware Requirements.
● Description
Defines the feature, describes what it does for the user, and how it is used.
● Considerations
Discusses the applications
and benefits of the feature, followed by feature
parameters and factors to be considered when the feature is used.
● Interactions
Lists and briefly describes other features that can affect the feature being described.
Interacting features are those that:
—
Depend on each other—One of the features must be provided if the other one
is.
—
Cannot coexist–One of the features cannot be provided if the other one is.
—
Affect each other–The operation of one feature modifies, or is modified by,
the operation of the other.
—
Enhance each other—The features, in combination, provide improved service
to the user.
● Administration Requirements
States whether or not administration is required and lists items requiring
administration.
● Hardware Requirements
List any additional hardware needed to use the feature.
Tabular listings of features by group (System,
Network, Data, Station, or Attendant)
immediately follow this introduction.
Each type, standard, or optional of the feature, is also
noted on these lists:
● Standard features—Built into each system (always provided but can require
administration to make them operational)
● Optional features–Such
as Music-On-Hold, require both administration and
additional hardware.
Features restricted to single-line or multiline voice terminals are noted where applicable.
The MET sets operate the same way as 5-button 7300H series voice terminals, unless
otherwise noted.
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