AT&T System 25 - Manual (Page 148)

INSTALLATION
INSTALL RECORDED DELAY ANNOUNCEMENT
D e l a y announcements are installed the same way as external alerts.
INSTALL DICTATION SYSTEM INTERFACE
If the equipment does not require a contact closure, follow the instructions
for installing external alerts.
If the equipment requires a contact closure, follow the instructions below for
connecting a paging system to the TN763 CP.
INSTALL PAGING SYSTEM INTERFACE
PagePac* Paging System, or compatible paging equipment, may be
connected to System 25.
System 25 provides three types of paging system interfaces. The paging
equipment can be connected to a TN763 Auxiliary Trunk, ZTN76 Ground
Start, or ZTN77 Loop Start Trunk CP.
The type of connection provided
depends on the customer’s equipment and/or requirements. Read the
paragraphs preceding the instructions provided to determine the correct
procedure.
Note: The PagePac 20 system is not normally connected to an
Auxiliary Trunk CP because only 1-zone paging is provided
by this connection. However, three PagePac systems can be
used for three zones provided by TN763.
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