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SECTION 1—OVERVIEW
This reference manual provides general technical information on AT&T System 25 (System
25). It includes a description of the system, its hardware and software, features and
services, environmental requirements, and technical specifications. This manual is intended
to serve as an overall technical reference for System 25.
This manual replaces AT&T System 25 Reference Manual (555-50-200, Issue 1), which
covered Release 1 Version 1 (RIV1 ) of System 25.
This new issue contains the original
coverage plus complete information on R1V2, a more powerful and versatile configuration of
the system.
R1V2 provides new features and services that enhance system operation,
particularly in the area of networking.
Here are some of the improvements:
● The Virtual Facilities addition enhances the customer’s outgoing network
capabilities.
● The AT&T STARLAN NETWORK (STARLAN NETWORK) Access feature provides
connectivity between System 25 and an associated STARLAN NETWORK.
●
Switched Loop Attendant Console operation makes the handling of incoming calls
from the network more efficient than in RIV1.
● With the Tandem Trunking feature, tie trunks can be used to call through System 25
to reach another switching system (CO or PBX).
● New voice terminals are provided for meeting specific system user needs.
● A new voice feature, Last Number Dialed, is added, and existing voice features are
improved.
●
Data services are enhanced with new options for placing and controlling calls.
Both RIV1 and R1V2 of System 25 are described in this manual. Unless specifically marked
as “VI” or “V2”, all of the information pertains to both versions. VI information applies
only to RIV1 systems; V2 information applies only to R1V2 systems.
Organization
The manual is divided into 10 Sections. The remaining Sections are as follows:
● SECTION 2–FEATURES AND SERVICES
● SECTION 3–FUNCTIONAL DESCRIPTION
● SECTION 4–HARDWARE DESCRIPTION
●
SECTION 5–TECHNICAL SPECIFICATIONS
●
SECTION 6–ENVIRONMENTAL REQUIREMENTS
● SECTION 7–PARTS INFORMATION
● SECTION 8–REFERENCE DOCUMENTATION
● SECTION 9–GLOSSARY
● SECTION 10–INDEX
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