Installation - Viking PA-250 Product Manual

A. Microphone Loud Paging
Step 1 Connect a balanced low impedance microphone to the MIC IN terminals (pins 1 & 2).
Step 2 Connect the microphone's shield wire to the SHIELD terminal (pin 3).
Step 3 Connect the microphone's Push-to-Talk leads (if available) to the PTT terminals (pins 3 & 4).
If the microphone does not have Push-to-Talk, the MIC VOX CONTROL feature must be enabled (enter
Step 4 1#42 in programming). The VOX Silence Time Out feature will end the page after 3 seconds of silence,
but is programmable from 1 - 9 seconds. S ee Programming section.
Step 5 Adjust the front panel MIC trim pot so the MIC LED flashes with mic audio.
B. Telecom Loud Paging
1. FXO (Loop Start) for Line Input (Trunk Port) or Analog Phone
Step 1 Move both back panel slide switches to the FXO (LOOP START) position.
Connect the phone system's Trunk Port / FXO / or an analog phone to the PAGE INPUT terminals
Step 2
(pins 5 & 6).
Step 3 Adjust the front panel PAGE trim pot so the PAGE LED flashes with page audio.
Shure Model 522
Base-Station
Microphone
with switch set to
"Low Impedance"
(not included)
PA-250 Back Panel
MICROPHONE
1 2 3
+
Unused Telephone Line
Input (Trunk Port) or FXO

Installation

MIC + (WHITE)
MIC -- (GREEN)
SHIELD
PUSH TO TALK (BLACK)
PUSH TO TALK (RED)
FXO (LOOP START)
FXS (RING TRIP)
PAGE PORT
4 5 6 7
PROG
+
FXO FXO
OR
3
PA-250 Back Panel
MICROPHONE
FXO (LOOP START)
FXS (RING TRIP)
PAGE PORT
1 2 3 4
PROG
+
8
Analog
Phone
5 6 7 8
+