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5
Installation Manual
Specific Instructions
Trunk Port Connections — Loop Start
Controls for VOX Delay, Page Time, and Mode Switch S5 are not operable in this mode.
Procedure
1.
2.
3.
4.
5.
6.
7.
8.
9.
10.
Mount and ground the UPAM as described in the General Instructions.
Set mode switches S1 and S2 in OFF position for use with the 48-volt power supply, or ON position
if a 24-volt power supply is used.
Set mode switches S3 and S4 for Preannounce or Confirmation tone (as desired).
Connect “Tip” of trunk port to T terminal on UPAM.
Connect “Ring” of trunk port to R terminal on UPAM.
Connect PT and PR terminals on UPAM to the paging system, as shown in Section 3. Also, connect
any background music source to the BGM IN jack on the UPAM.
Connect power supply + and - terminals to the +24V/48V and -24V/48V terminals on UPAM,
respectively. Plug the power supply into a grounded 110VAC wall outlet.
Call the system and adjust the volume of the page using the paging system’s amplifier volume control.
Hang up and adjust the background music level using the UPAM BGM VOL control.
Call the system and adjust the volume of the preannounce/confirmation tone, using the UPAM
TONE
VOL control.
405899972
AT&T
UPAM
Universal Paging Access Module
BGM
IN
MODE
OFF
ON
24 VDC PWR SUPPLY
48 VDC PWR SUPPLY
CONFIRMATION TONE
PREANNOUNCE TONE
VOX DISABLE
VOX ENABLE
—
S1,S2
S3
S4
S5
—
S1,S2
—
S4
S3
—
S5
PHONE SYSTEM
T
R
EXT VOX ENABLE
+M
-M
PAGING OUTPUT
PT
PR
PAGE PORT
INPUT
CONTACT CLOSURE
N.O.
COM
POWER SUPPLY
+24/48
-24/48
MODE
SWITCHES
BGM
VOL
MIN
MAX
MIN
MAX
MIN MAX
CONTACT CLOSURE B
TONE VOL
VOX DELAY PAGING TIME
N.O. COM
405742735
117V
200 mA
60 Hz
MODEL PRS-48
CAUTION: FOR INDOOR USE ONLY
48 V
200mA AC
+ -
GND
PBX / KEY SYSTEM
LOOP START
TRUNK PORT
T
R
Trunk Port Connections — Loop Start