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Installation Manual
10
Ring delay
Cutting jumper J1 increases the length of time it takes to answer the ringing line. This allows time
for a talk path to be established before the UPAM answers, thereby ensuring that the preannounce or
confirmation tone will be heard. Central office or Centrex lines, which may be slower than other
switching equipment, may require this modification.
(The jumper seldom needs to be cut.)
1.
Open UPAM by removing 4 screws. Lift cover straight off while tilting up the left side of the cover to
clear the punch block.
2.
Move large axial lead capacitor to expose jumper
J1.
(Refer to the illustrations on page 11 to determine
the revision level of the pc board and the location of the jumpers.)
3.
4.
Cut jumper.
Replace cover in reverse order of Step 1.
PBX / CENTREX LINE
405899972
UPAM
Universal Paging Access Module
AT&T
BGM
IN
48 VDC PWR SUPPLY S1,S2
CONFIRMATION TONE S3
PREANNOUNCE TONE S4
VOX DISABLE
S5
S1,S2
—
S4
S3
—
S5
PHONE SYSTEM
T
R
EXT VOX ENABLE
+M
-M
VOX ENABLE
PT
PR
PAGE PORT
INPUT
N.O.
COM
+24/48
-24/48
BGM
VOL
MIN
MAX
MIN
MAX
MIN
MAX
PAGING TIME
Station Port/Centrex Connections
STATION
PORT
T
R
MODE
OFF
ON
24 VDC PWR SUPPLY
—
—
PAGING OUTPUT
CONTACT CLOSURE
POWER SUPPLY
MODE
SWITCHES
CONTACT CLOSURE B
N.O.
COM
TONE VOL. VOX DELAY