Instruction manual

FEATURES AND SERVICES
Symbols Used in Illustrations
Many feature descriptions in this section contain illustrations of equipment and connections.
In the connection figures, modular jacks are shown as triangles; 25-pair cable connectors are
indicated by shaded blocks.
Unterminated wiring that requires cutdown or other termination
does not have symbol designations.
The 103A Connecting Block is a typical modular wall
jack that provides cutdown connections for building (station) wiring.
Feature Tables
Tables 2-A through 2-E list all the features of System 25. Each feature is specified as
Standard or Optional.
Standard features are built into the system. They are always provided but may require
administration to make them operational.
Standard features are identified in the feature
tables by the letter S.
Optional features require both administration and additional equipment. Music-On-Hold is an
example. Optional features are identified by the letter O.
Bracketed words in the tables are the standard labels of the associated feature buttons.
These labels are also used in the feature descriptions.
2-2