Installation Manual
2Features
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Acts as point of demarcation
Acts as a point of demarcation between telephone system and customer paging equipment.
24V or 48V operation (trunk port operation)
Mode switches let you select 24-volt or 48-volt operation. A 48-volt power supply is included to provide
48-volt trunk port operation (a 24-volt power supply is required for 24-volt operation).
Preannounce and Confirmation Tones
A preannounce tone (heard at the telephone and the loudspeakers) or confirmation tone (heard only
at the telephone) can be selected with mode switches (one of these modes must be selected for the
unit to operate properly). A screwdriver-adjustable control (TONE VOL) sets the level of each.
(Note: when used with ground-start trunk ports, only the preannounce option can be used.)
VOX Delay Timer
Voice controlled disconnect timer, for use in station port operation is enabled with a mode switch.
This automatically disconnects the line after a predetermined interval of silence (from 2 to 6 seconds,
set with the
VOX DELAY
control; the setting may be critical with telephone systems that issue a rapid
reorder tone after the paging party hangs up).
Default Timer
A default timer sets the maximum time allotment for paging (6 to 35 seconds, set with the PAGING
TIME
control). This timer ensures that the unit will always disengage the line by forcing a disconnect,
if the other disconnect functions are disabled or not available with a specific telephone switch.
Note:
The timer may be inhibited; see Default Timer Modifications on page 9 for procedure.
Background music input jack and volume control
An RCA-type jack (BGM IN) accepts background music sources from the paging system. The level
can be set with the BGM VOL control. An RCA-jack connector cord and RCA jack adaptors are
included in the kit to connect with some common background music sources.
Contact Closures
Two normally-open contact closures are provided on the UPAM which change state when the unit is
activated. One set is located on the punch block (terminals N.O. and COM), and the other one on
the bottom side of the unit (terminal strip). One contact closure can be used for ground start operation.
The second contact closure is available to provide control of external equipment or functions. When
the UPAM is used on a loop start trunk, page port, or station line, both contact closures become
available to provide control of external equipment or functions.
Direct connection to page ports through a modular jack on the side of the unit
An 8-conductor modular connector cable is included for easy connection to modular page ports.