Viking pi-1 Service Manual

Telecommunication Peripheral Products

Telecom/Paging Interface

PI-1

Universal

Technical Practice

December 12, 2001

Interface Your Paging System with

Nearly Any Phone System!

Viking’s Universal Telecom/Paging Interface
allows you to provide paging from nearly any
phone system instead of from a microphone.
You can also provide background music and
electronic night bell over the audio system.

The PI-1 features a built-in voice activated (VOX)
or AC ring activated relay which provides D.P.D.
T. contacts for muting background music during
paging or to provide an electronic night bell.
These contacts are necessary when interfacing
with systems such as Panasonic, South Western

activatedBell, Intertel, etc., which do not provide a paging contact closure.

In the event a paging port is not available, the PI-1 can provide talk battery to allow
connection of the public address system to an unused trunk input on the phone
system.

VIKING©

The electronic night bell feature is activated by a standard ringing C.O. line, analog
PABX/KSU station circuit or by a common audible contact closure provided by an
electronic key system.

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Features Applications

• Floating 600 ohm output

• Selectable 12V DC talk battery for interfacing
with C.O. ports

• Paging port interface

• Ringing analog line input for night bell

• Contact closure input for night bell

• Normally open and normally closed VOX
activated contacts for cutting out background
music

• Adjustable VOX contact time-out

• Adjustable ring volume

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• Integrate your public address system with nearly
any phone system

• Cut out background music during paging

• Electronic night bell from ringing line or contact
closure

Specifications

Power: 120V AC/12V DC 500mA, UL listed adapter provided
Dimensions: 133mm x 89mm x 44mm (5.25” x 3.5” x 1.75”)
Shipping Weight: .45 kg (1 lb)
Environmental: 0°C to 32°C (32°F to 90°F) with 5% to 95% non-

condensing humidity

Relay Contacts: 30V DC@1A, 110V DC@0.3A, 125V AC @0.5
Maximum Ring Output: 490mV AC RMS no load, 150mV AC

RMS@600 ohms
VOX Minimum Audio Signal to Activate Relay: 50mV AC
RMS@1K Hz
Talk Battery: 12V DC

Installation

The ringing (warble) output volume is
adjustable as shown to the right.
Minimum: 0 mV RMS, Maximum: 490
mV RMS.

120V AC

To Contact Closure
(for optional warble)

Ringing C.O. line

or analog

PABX/KSU station

Ring Volume

Control

+- +-

0mV 490mV .33s 3.5s

Yellow

Black

Red

Green

UNIVERSAL TELECOM/PAGING

RING VOL

POWER - 12 VDC

NIGHT

RING
RJ-11

INTERFACE

ELECTRONICS

HUDSON, WI 54016

VIKING©

MODEL PI-1

AUX

PT PP

RELAY

VIKING

AUDIO IN

1 2 3 4 5 6 7

Time Out

Delay

The voice activated contact closures
(Terminal Screws 3, 4, 5 and Jack Pins
2,3,4) on the PI-1 have a selectable time
out delay function. This adjusts the time
between the last word and the relay
releasing (contact closure). Minimum:
.33 seconds, Maximum: 3.5 seconds.

TIME OUT

RELAY

N.O. COM N.C. AUDIO OUT

Paging Amplifier - Floating 600

ohm output, connect to input of
paging amplifier.

Music Source

Unused Trunk Input or Paging Output - Connect to a page

port output or an unused C.O. line input (trunk port).

Switch

PP
PT

Talk

Battery

OFF

ON

For Use With

Paging output of PABX/KSU

Unused trunk input of PABX/KSU

Auxiliary Relay Jack - The auxiliary modular

relay jack is a second set of contacts that
work in conjunction with terminal screws 3,4
and 5. A regulated 12V DC output is
provided to operate external relays or other
devices.

Normally Closed

+12V DC

Common

Normally Open

Ground

6 5 4 3 2 1

Operation

When voice is detected on the “AUDIO IN” circuit, the PI-1 opens the normally closed contacts and
closes the normally open contacts allowing background music source to be interfaced without
interfering with paging. Depending on the selectable time-out delay, the music source will come
back between .33 and 3.5 seconds after the last word. A floating 600 ohm output is provided to
interface with most standard public address systems.

The PI-1 will also produce a 600 ohm night bell warble from a contact closure, ringing C.O. or
analog PABX/KSU station. This warble volume can be adjusted using the RING VOL potentiometer
as shown above.

Product Support Line...[phone] Fax Back Line...[phone]

Due to the dynamic nature of the product design, the information contained in this document is subject to change without notice. Viking
Electronics, its affiliates and/or subsidiaries assume no responsibility for errors and/or omissions contained in this information. Revisions of
this document or new editions of it may be issued to incorporate such changes.

Printed in the U.S.A. ZF290500 Rev EFax Back Doc # 490