Specifications

This audio input allows any additional audio sources to be connected into the SA-25 on screw terminals 10 & 11. Possible uses are:
audio from another paging system, clock controlled tones to announce work shift times (see Viking model CTG-1), emergency siren
(see Viking model DNA-510 or MTG-10), digitally recorded announcements (see Viking model DVA-500A or DVA-2WA), etc.
The SA-25 relies on its internal Voice Activation Switch (VOX) feature to switch to the Aux Input when audio is loud enough to be
detected. The VOX sensitivity can be adjusted using the Aux In Level Trim Pot located just behind the Aux In screw terminals. Adjust
this Pot so the Aux In LED flashes with Aux audio. When relying on VOX activation, the very beginning of the audio will be cut off.
This will be especially noticeable when using the SA-25 in the Smart Mode, where an extra fraction of a second is needed for the
SA-25 to signal the speakers that have been muted for no background music to turn themselves back on.
D. Aux In
This audio output / input is provided so that a SA-X12 or a SA-25 can be added if additional self-amplified speakers are needed.
E. 600 Ohm Output / Input
A master volume control is provided. Use this to limit the maximum speaker volume of the self-amplified speakers when the infrared
remote has them turned all the way up.
F. Master Volume
2. Unused Trunk/Line Input (FXO), or Dedicated Analog Telephone
If paging from a phone system’s unused trunk/line input (FXO), or a dedicated analog telephone, DIP Switch 1 must be turned
ON (so the SA-25 will provide the necessary 40V DC Talk Battery), and the Slide Switch set to TRUNK. To page, either access
that trunk port or go off hook on the analog telephone. Loop current will be detected and activate paging. Wait for the Pre-Page
Alert Tone to pass (if enabled), and then speak.
The SA-25 will automatically provide a CPC signal to the phone system if the trunk port has not dropped within 60 seconds. If
a user fails to release the trunk after making a page, the CPC signal acts as a safety net to clear the trunk so it will be available
for the next page.
3. Paging Port with Page Contacts
When using a phone system’s paging port, if a page contact closure is available from the phone system, wire the contacts to
screw terminals 14 & 15. DIP Switch 1 must be turned OFF and the Slide Switch set to PAGING. To page, simply access the
phone system’s paging port, (the contact closure will activate the SA-25’s paging input). Wait for the Pre-Page Alert Tone to pass
(if enabled), and then speak.
4. Paging Port without Page Contacts
DIP Switch 1 must be turned OFF and the Slide Switch set to PAGING. When paging from a paging port and there are no page
contacts available, the SA-25 relies on its internal Voice Activation Switch (VOX) feature to switch to paging when voice audio
is detected. This means the voice audio must be loud enough to be detected. The VOX sensitivity can be adjusted using the
Page Level Trim Pot located just behind the Page In screw terminals. Adjust this Pot so the Page LED flashes with page audio.
A pre-page alert tone would not happen until the person starts talking, so it is recommended that the Pre-Page Alert Tone is dis-
abled (set DIP Switch 3 to OFF), unless using the below Tip. To page, simply access the phone system’s paging port and speak.
Tip: When relying on VOX activation, the very beginning of the page will be cut off. If this is objectionable, the user can make
some sort of sound (like pressing a touch tone, or saying the word “paging”) to activate the VOX before speaking. This will be
especially helpful when using the SA-25 in the Smart Mode where an extra fraction of a second is needed for the SA-25 to sig-
nal the speakers that have been muted for no background music, to turn themselves back on.
Since there are multiple uses and inputs to the SA-25, priorities need to be established to prevent contentions. If two inputs are acti-
vated at the same time, the one with the highest priority will take effect. Examples: Paging is higher priority then Loud Ringing, so
Paging would interrupt loud ringing tones. The Background Music input is always the lowest priority, and thus can be interrupted by
any other input. Two different DIP Switch programmable Priority selections are available as listed below.
G. Priorities
Normal Priority (DIP Switch 2 OFF)
1. Aux In
2. Paging
3. Ringing
4. Background Music
Alternative Priority (DIP Switch 2 ON)
1. Paging
2. Aux In
3. Ringing
4. Background Music
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