System 25 Voice Terminal Overview - AT&T SYSTEM 25 Manual

System 25 Voice Terminal Overview

This section is an overview of System 25 voice terminal operation. It describes the functions
of voice terminal tones, lights, and feature buttons.
Voice Terminals Supported
System 25 supports a maximum of 142 multiline voice terminals in addition to two multilines
assigned as attendant consoles. Of the 142 voice terminals, up to 96 may be 22- or 34-button
types.
Single-Line Terminals
Multiline Terminals
Attendant Consoles
For further information on specific models of voice terminals supported by System 25, see the
R2V1 Reference Manual.
DDCS and PDCS
When System 25 was installed, Data Dial Codes (DDCs) were assigned to data terminals and
Personal Dial Codes (PDCs) were assigned to voice terminals. In most cases, a PDC is
equivalent to an extension number. Visitors and those who do not have exclusive use of a
voice terminal may have been assigned Floating Personal Dial Codes (FPDCs).
Calling Restrictions
Calling restrictions, such as toll restriction and dial-access restriction, are established on a
per-terminal (not PDC) basis by the System Administrator. Attempts to place calls that
conflict with specified restrictions receive fast busy (reorder) tone at a voice terminal or a
denial message at a data terminal. For further information, see the "Calling Restrictions"
feature description in the R2V1 Reference Manual.
® MERLIN is a registered trademark of AT&T.
® HORIZON is a registered trademark of AT&T.
System 25 supports both rotary and touch-tone single-line voice
terminals.
System 25 supports many models of multiline voice terminals,
including the MERLIN® CS family of multiline voice terminals and
the HORIZON® CS Multibutton Electronic Telephone (MET) voice
terminals.
The System 25 supports up to two Direct Trunk Attendant
Consoles (DTACs) or up to two Switched Loop Attendant Consoles
(SLACs). The Direct Extension Selector Console is specifically
designed for use with System 25 attendant consoles.
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