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17
Installation Manual
Connecting the UPAM to an amplifier’s MIC input
Due to the higher sensitivity of microphone inputs, they should be used only as a last resort. The
Lo-Z microphone connection is the more desirable of the two because it is less susceptible to noise
pickup. The UPAM connects to the MIC input using the WMT-1A transformer. This transformer includes
a modification to provide the proper attenuation (see instructions packed with the transformer). More
information on microphone inputs is provided in the UPAM CPE Reference Guide.
1.
Make sure the amplifier is turned off.
Modify the WMT-1A transformer by moving the push-on lug to the center terminal on the terminal
strip (see inset diagram in the figure below for proper jumper placement).
2.
Connect
PT
terminal of the UPAM to one of the outside screw terminals on the WMT-1A.
3.
Connect
PR
terminal of UPAM to the other outside screw terminal on the WMT-1A.
4.
Connect a suitable adaptor to the RCA-type plug on the WMT-1A (if required).
5.
Connect any background music source to BGM IN jack (RCA-type) on the UPAM.
6.
Connect speaker loads to the amplifier’s output terminals, if necessary.
7. Set amplifier volume control to minimum.
8.
Turn amplifier on.
9.
Set amplifier level (see Specific Instructions for the particular telephone access mode being used).
405899972
BACKGROUND MUSIC SOURCE
AT&T
UPAM
MODE OFF
ON
24 VDC PWR SUPPLY
—
S1,S2
48 VDC PWR SUPPLY
S1,S2
—
CONFIRMATION TONE
S3 S4
PREANNOUNCE TONE
S4 S3
VOX DISABLE
S5
—
VOX ENABLE
—
S5
Universal Paging Access Module
BGM
IN
PHONE SYSTEM
T
R
+M
EXT VOX ENABLE
-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
TONE VOL.
VOX DELAY PAGING TIME
CONTACT CLOSURE B
N.O.
COM
600 OHMS
CT
405891680
WMT-1A
PAGING AMPLIFIER WITH LO-Z MIC INPUTS
AUX 1
70V COM2
AUX
POWER
300W
MAX
AUX 2
120 VAC
60 Hz
2.5 A
MIC 1 MIC 2
JUMPER
CONFIGURATION
FOR MIC
INPUT
LOUDSPEAKERS
Typical connection to a MIC input